Squashed commit of the following:

commit 931d6ab0e025b0268d94e455f736b09a025e0578
Merge: b34d165320d 93846eb152f
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Mon Nov 5 09:36:58 2018 +0900

    Merge branch 'master-ce' into stateful_deployments

commit b34d165320d6f3298c8b776ba66270a59c217412
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Fri Nov 2 18:07:08 2018 +0900

    Fix flaky spec

commit b5e0527c5d4fe8f18b2fdda5916bae9b8cd859a4
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Fri Nov 2 15:32:03 2018 +0900

    Fix spec

commit f78a5e96e66fe2d25086df495e339b470a274df8
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Fri Nov 2 14:59:29 2018 +0900

    Remove unnecessary line in schema.rb

commit 6ce7c483e0591b5d6f9588a99853834327b80031
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Fri Nov 2 14:55:48 2018 +0900

    Add partial index for filling deployment at migration

commit aecccfb5118c8982db3ba502fdf37b5e639fbfc6
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Fri Nov 2 14:42:24 2018 +0900

    Fix fill empty finished at migration

commit 0199e1761ad1b391ae87a53a9a113d3256529e0e
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Fri Nov 2 14:19:44 2018 +0900

    Fix flaky spec

commit 56ac84cd8095afab5b909119445537b7da06a2ff
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Fri Nov 2 10:06:49 2018 +0900

    Fix guard clause to prevent multiple deployments to a job

commit 521561b6b303b54635c30cb23d78e49d14cec53d
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Nov 1 20:19:24 2018 +0900

    Fix spec

commit 2878da0d29b9bd2dde69a1b216203df118dd59a1
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Nov 1 19:38:59 2018 +0900

    Simplify the factory

commit 22fd7df02133f3a21828554965fd5619905eac2c
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Nov 1 19:33:50 2018 +0900

    Simplify the Deployable and BuildSuccessWorker

commit 41108959677ed614f4548443a2f4303c4c04925a
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Nov 1 18:34:20 2018 +0900

    Fix spec

commit ae75fe7461ac72f621498797f478d42331342b84
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Nov 1 17:19:12 2018 +0900

    Fix weird virtual deployment status

commit 380fee7494d06407dccc292c3cbedbcee7b6e235
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Nov 1 15:59:31 2018 +0900

    Fix spec

commit 29889fcbaadb3bbfd2f11c10bfbf5dceb3e3ddba
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Nov 1 15:07:10 2018 +0900

    Fix coding offence

commit 36ac13f345f5ef25725c2236a791a40a3a9e6126
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Nov 1 14:22:17 2018 +0900

    Squashed commit of the following:

    commit ba9aede922e1643db3f06c56736d46d6d86d356b
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Thu Nov 1 14:21:33 2018 +0900

        Fix ambiguious factory specification in update deployment service spec

    commit 013afb5668cb30dc4ca5b21945c17b341e7ea7f9
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Thu Nov 1 14:10:24 2018 +0900

        Fix spec

    commit 78793670d049e2dfb5fc98177eb4d10f20b9310b
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Wed Oct 31 18:26:12 2018 +0900

        Fix spec

    commit 73d27e87c66698f2e3a817bb8728f02475b7ba4f
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Wed Oct 31 16:22:14 2018 +0900

        Fix index

    commit 8580a226ea68bf5e49b35bfb5f404968bbfaf8e9
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Wed Oct 31 15:34:57 2018 +0900

        Fix deployment relationships in Ci::Build

    commit d6d28b55afd1179200b4f5188e0b53079ff3c1a7
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Wed Oct 31 15:27:53 2018 +0900

        Fix spec

    commit 94eb754e2e1bb9a1fe627f86823f571a8298d27b
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Wed Oct 31 14:07:11 2018 +0900

        Fix spec

    commit 0b30f80bcd08a7a06bdde3378ec1733f865284be
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Tue Oct 30 20:15:31 2018 +0900

        Fix spec

    commit 466bdcdb6af8cdb475c9fa16bd7d1dff23b11e40
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Tue Oct 30 19:28:51 2018 +0900

        Fix spec

    commit a7c3caac99139e70fe3f1f3d14856939fa25c527
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Tue Oct 30 17:33:47 2018 +0900

        Fix factory

    commit cea28ae100532e6711ce1d22676719a94e2da8a0
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Tue Oct 30 16:28:18 2018 +0900

        Drop leagacy success

    commit 3785d685eabc10b6597cf3db67bf08385ccf298a
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Tue Oct 30 15:37:28 2018 +0900

        Remove unnecessary migration file

    commit 0d597fa46eeffdbb9a4afb53005a8183e433c6bf
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Tue Oct 30 15:35:53 2018 +0900

        Fix schema.rb

    commit ec3c2abc6944e09f6410468ae5e356865ec7b02b
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Tue Oct 30 15:34:21 2018 +0900

        Rename post migration file

    commit 0e7281885a84656acf95f0f423732680f8fec076
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Tue Oct 30 15:31:01 2018 +0900

        Remove include EnumWithNil

    commit b3846d59c07e07275126c70361bde7f30810729e
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Tue Oct 30 15:05:50 2018 +0900

        Decouple action

    commit c9f9ba4eae9ca1edc7d8751e1d2e0572cb222d9c
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Tue Oct 30 14:23:29 2018 +0900

        Remove status mock

    commit d95bfea1ca67b3a27a3226a669c2b1266d696682
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Tue Oct 30 14:17:14 2018 +0900

        Add action

    commit 0cec39e0f76c22a18498f46d65ad7226fb30c3f8
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Tue Oct 30 13:44:07 2018 +0900

        Remove unnecessary line in schema.rb

    commit 7b4c5f8e1b00dd8e6aa944352f9d8a9f3ae6f1c7
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Mon Oct 29 19:59:41 2018 +0900

        Revert build success worker

    commit 0c52ffa4a23eea488c187317e8b400369846f399
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Mon Oct 29 19:11:47 2018 +0900

        Use add_column_with_default properly

    commit ba9bae357da5dfd2f6ec05f7f9db9d0b31224f48
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Mon Oct 29 18:40:55 2018 +0900

        Fix with_status

    commit 75dffc97b9c5f6fa73d9d09b125c8f849fa2caae
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Mon Oct 29 16:26:56 2018 +0900

        Remove unnecessary line in schema.rb

    commit 25188ccc52fb29ca63b9205c4d95ffc2e0afadee
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Mon Oct 29 16:26:17 2018 +0900

        Set default values in regular migration

    commit 98ea037fbf39c8d9f0db77fb50e2d08382425158
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Fri Oct 26 17:27:49 2018 +0900

        Fix static analysis

    commit e7d1765f77f9ff9b94a34985a7855bdaab1da675
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Fri Oct 26 16:37:10 2018 +0900

        Remove empty spec

    commit 0033f521ed1eae8117dba231961aa47c068bbcfb
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Fri Oct 26 16:34:55 2018 +0900

        Simplify spec changes

    commit 0be4c6b3ade6d9a8bf28bcd177c66ebd7bb7d20a
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Fri Oct 26 16:32:45 2018 +0900

        Simplify spec changes

    commit a93d25d79df7e25bdf688fc938c712922f9dc4df
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Fri Oct 26 16:02:31 2018 +0900

        Fix flaky spec

    commit 339ad50cf471ca706b29f008ccd2bb881dd5b776
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Fri Oct 26 15:06:22 2018 +0900

        Rename Deployments Success worker

    commit bd69c78085adcb9b0f8ff9b7041ae355953ad7ab
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Fri Oct 26 14:43:03 2018 +0900

        Fix coding offence

    commit 004748b2a9c5236ec13eb01289418f3d6571c92c
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Thu Oct 25 20:09:10 2018 +0900

        Rename to update deployment service

    commit b04a85e761de501f030f3844fd485a2b9e46f7f7
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Thu Oct 25 18:46:52 2018 +0900

        Add spec for Project

    commit 548af23a5a07f0c20b72849d03aa0b98a0b49134
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Thu Oct 25 18:43:25 2018 +0900

        Fix spec

    commit c977e4d3f17194c46a1bf857b473017ce21ef7e9
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Thu Oct 25 17:58:07 2018 +0900

        Add spec for Environment

    commit 73feb9010f8d8093bee4b46e56d30cfef3e8e34a
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Thu Oct 25 17:39:24 2018 +0900

        Add spec for Deployment model

    commit 9a3cfbf766f402571588839375cf311bb9807035
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Thu Oct 25 17:18:02 2018 +0900

        Fix statis analysis

    commit a30d28dbc631a29855883ca89c592a10c012f1d2
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Thu Oct 25 17:17:32 2018 +0900

        Ignore nil instance

    commit fa6fdd89f380e588a6bcf14b1f9aef0d14d3854b
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Thu Oct 25 16:20:40 2018 +0900

        Add spec for deployable concern

    commit aa91186821dc671df2c7a641e37586dd5dfc1008
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Thu Oct 25 15:37:23 2018 +0900

        Clean up deployable

    commit 34d3e18731f7906a3db250b105a64d1db83c2fca
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Thu Oct 25 15:13:05 2018 +0900

        Fix 17 cycle analytics

    commit 8dc9e00408f9b390175e7d5ea743eed4fb9e3f79
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Thu Oct 25 13:56:51 2018 +0900

        Fix static analysys

    commit 5c4175807a537bafc4b889b0a97e8f96f0e483cd
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Wed Oct 24 15:05:05 2018 +0900

        Skip unnecessary sidekiq worker

    commit 9d8b5d423f49cc247c96ce3767d03b4af305809f
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Wed Oct 24 14:53:13 2018 +0900

        Add changelog

    commit c8cabba496722240cadf7c161c80bceb09727cba
    Author: Shinya Maeda <shinya@gitlab.com>
    Date:   Wed Oct 24 14:44:45 2018 +0900

        Squashed commit of the following:

        commit f7643885ac2329e18d690a4e4f2d7614b732c793
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Tue Oct 23 19:38:45 2018 +0900

            Fix deployment widget specs

        commit 03bd04b5c98b634dff6a0ab4292c150a9031995c
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Tue Oct 23 17:50:16 2018 +0900

            Fix env status spec

        commit 4a49c6502b161a12f0f62d5ec167dff777047dab
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Tue Oct 23 17:48:59 2018 +0900

            Fix environment spec

        commit 4044822887987e20a703990ff20352a532eeb965
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Tue Oct 23 17:47:17 2018 +0900

            Fix environment spec

        commit 9939d44b7eb9da371de74c0f04fed1eb3db37ad3
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Tue Oct 23 15:45:43 2018 +0900

            Add a new spec for deployment success worker

        commit f61c4d3657b5ef13b5da171460da68a6643ad4b5
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Tue Oct 23 15:38:11 2018 +0900

            Fix cycle analytics helper

        commit b6242615e8298fb7fc047c8df8006c25ad717c70
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Tue Oct 23 14:41:54 2018 +0900

            Fix cycle analysis helper

        commit 9a001cb4c4ed6f3b87dc612bdffc60a6b2b0a132
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Tue Oct 23 14:37:08 2018 +0900

            Ignore coding offence in build success worker's spec

        commit 1fb88583025bac8a56172cbd59be04258ea4c5f3
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Tue Oct 23 14:33:11 2018 +0900

            Added more spec for deployments

        commit 1a6ba97ababbf62e8dd0ae0c56d75ab1268fd0ce
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Mon Oct 22 19:36:50 2018 +0900

            Move after create hookd into success worker

        commit 09de5fed5d6f108423779cf9d9e7f1d21f3c1c91
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Mon Oct 22 19:30:06 2018 +0900

            Fix build spec

        commit 73a55cbcabbb1e928eca3e53e8ff75dec178bc90
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Mon Oct 22 19:08:43 2018 +0900

            Fix update_deployment_metrics_service_spec.rb

        commit ee05136a02ae9fa348b4b89b9a69937ebb9697dd
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Mon Oct 22 17:32:05 2018 +0900

            Remove unnecessary degelate

        commit e246ddeebc01a807ccc36fdb484c3e72ad91e680
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Mon Oct 22 16:07:39 2018 +0900

            Remove unnecessary optimistic locking

        commit dcc225c8237b90e3bc8dcc3dc2e3252e0b0be093
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Mon Oct 22 16:00:22 2018 +0900

            Simplify status replication

        commit 13a5fd7afb67ba2712fcaecaea5fedf05f9ad177
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Mon Oct 22 15:29:24 2018 +0900

            Fix sidekiq queue names

        commit dcc796f48d523538e1c91b9cd3e1c7065e5329b1
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Mon Oct 22 15:23:55 2018 +0900

            Revert success check in update_merge_request_metrics

        commit 129ef083d637d4acb8c97a6d9ab96deb2ff6efcd
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Mon Oct 22 15:18:31 2018 +0900

            Fix queue name of deployment success worker

        commit 10fe5a6484f4f02322ce5bb16844fc7b1d565963
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Mon Oct 22 15:09:42 2018 +0900

            Introduce deployable module

        commit d91260bbe105bf46f6c06d9e9593c8c4cd5139cf
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Mon Oct 22 14:05:31 2018 +0900

            Add database index for successful deployments

        commit 74274147263de4b60870065a19935498ce662e30
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Mon Oct 22 13:51:59 2018 +0900

            Fix invalid state transition

        commit ff18463cc847bf3cf5a3e49f3651eedfdf67c7e6
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Fri Oct 19 20:05:15 2018 +0900

            Fix coding style offence

        commit 0202c0f5b631601edab7b359b087b307f5eb7ba3
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Fri Oct 19 18:34:07 2018 +0900

            Target only successful deployments from other relations

        commit 1f2758cb030dec1df5dda30f6bc3e25b6d0841c9
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Fri Oct 19 18:21:28 2018 +0900

            Add namespace explicitly

        commit 3d9227b6e5642cecde88d4edac925125f6474b11
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Fri Oct 19 17:42:30 2018 +0900

            Fix spec in DeleteInconsistentInternalIdRecords

        commit 3e0cc99ff6c5c7188511618228a6ec027752ce69
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Fri Oct 19 16:10:16 2018 +0900

            Fixed spec

        commit 8de09b8bb31f7b9f24ecdf9f2dd8ef358a260263
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Fri Oct 19 14:22:35 2018 +0900

            Fix create deployment service

        commit 31957570b4444492eeb412e765f96a56416c25f3
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Thu Oct 18 20:21:26 2018 +0900

            Move CreateDeploymentService. Fix Cycle analytics spec and fixture.

        commit d2eb433a1bb9710c0d4778c4f34c12b6b64f60e6
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Thu Oct 18 20:11:22 2018 +0900

            Fix build success worker

        commit 25e6cd87138bcdb69de8785ca367e479c8dbcc59
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Thu Oct 18 19:49:13 2018 +0900

            Fix create deployment service spec

        commit d268bf410bf65e86c81eb76d50aa8e145b32d249
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Thu Oct 18 19:01:23 2018 +0900

            Fix cycle analysys spec's deployment

        commit 525ade8aa1e4394ed8a759bb0437e407fbe74a35
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Thu Oct 18 18:24:04 2018 +0900

            Fix factory to set legacy status by default

        commit c6a990821ac0a1ffa49e20e2d78d94b8ce075914
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Thu Oct 18 17:25:40 2018 +0900

            Remove unnecessary lib from deployment

        commit a6107e0e85ac26ee09da3316ebc11de32f067d82
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Wed Oct 17 17:38:58 2018 +0900

            Fix recursive call

        commit 15c5f3b64061a75af3c3039ca7f49b1cc4ff3068
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Wed Oct 17 17:30:44 2018 +0900

            Add finished_at

        commit c8d3d70366f694d78acb7e30d342c7697798b922
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Wed Oct 17 15:55:31 2018 +0900

            Fix last_deployment methods as it used to return successful deployment always

        commit 96bbe8670cece021766fde95fe573cbbe23d1e55
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Wed Oct 17 15:49:57 2018 +0900

            Redefine statuses

        commit c86a9d0bd2ab3e7a00bf61f094a96ee99b76b289
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Wed Oct 17 14:50:27 2018 +0900

            Fix schema.rb

        commit 9ff5f0eaafbc08795018c7bb282b19f6327dee21
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Wed Oct 17 14:18:04 2018 +0900

            Default status nil to success

        commit 5928bd9bb94e1e8908ed1561e01595be84d5f4ec
        Author: Shinya Maeda <shinya@gitlab.com>
        Date:   Tue Oct 16 15:13:48 2018 +0900

            Add status to Deployment

7 files changed, 431 insertions, 48 deletions

diff --git a/spec/models/ci/build_spec.rb b/spec/models/ci/build_spec.rb
index 4089f099fdf..2e65a6a2a0f 100644
--- a/spec/models/ci/build_spec.rb
+++ b/spec/models/ci/build_spec.rb
@@ -17,8 +17,8 @@ describe Ci::Build do
   it { is_expected.to belong_to(:runner) }
   it { is_expected.to belong_to(:trigger_request) }
   it { is_expected.to belong_to(:erased_by) }
-  it { is_expected.to have_many(:deployments) }
   it { is_expected.to have_many(:trace_sections)}
+  it { is_expected.to have_one(:deployment) }
   it { is_expected.to have_one(:runner_session)}
   it { is_expected.to validate_presence_of(:ref) }
   it { is_expected.to respond_to(:has_trace?) }
@@ -799,17 +799,100 @@ describe Ci::Build do
     end
   end
 
+  describe 'state transition as a deployable' do
+    let!(:build) { create(:ci_build, :start_review_app) }
+    let(:deployment) { build.deployment }
+    let(:environment) { deployment.environment }
+
+    it 'has deployments record with created status' do
+      expect(deployment).to be_created
+      expect(environment.name).to eq('review/master')
+    end
+
+    context 'when transits to running' do
+      before do
+        build.run!
+      end
+
+      it 'transits deployment status to running' do
+        expect(deployment).to be_running
+      end
+    end
+
+    context 'when transits to success' do
+      before do
+        allow(Deployments::SuccessWorker).to receive(:perform_async)
+        build.success!
+      end
+
+      it 'transits deployment status to success' do
+        expect(deployment).to be_success
+      end
+    end
+
+    context 'when transits to failed' do
+      before do
+        build.drop!
+      end
+
+      it 'transits deployment status to failed' do
+        expect(deployment).to be_failed
+      end
+    end
+
+    context 'when transits to skipped' do
+      before do
+        build.skip!
+      end
+
+      it 'transits deployment status to canceled' do
+        expect(deployment).to be_canceled
+      end
+    end
+
+    context 'when transits to canceled' do
+      before do
+        build.cancel!
+      end
+
+      it 'transits deployment status to canceled' do
+        expect(deployment).to be_canceled
+      end
+    end
+  end
+
+  describe '#on_stop' do
+    subject { build.on_stop }
+
+    context 'when a job has a specification that it can be stopped from the other job' do
+      let(:build) { create(:ci_build, :start_review_app) }
+
+      it 'returns the other job name' do
+        is_expected.to eq('stop_review_app')
+      end
+    end
+
+    context 'when a job does not have environment information' do
+      let(:build) { create(:ci_build) }
+
+      it 'returns nil' do
+        is_expected.to be_nil
+      end
+    end
+  end
+
   describe 'deployment' do
-    describe '#last_deployment' do
-      subject { build.last_deployment }
+    describe '#has_deployment?' do
+      subject { build.has_deployment? }
+
+      context 'when build has a deployment' do
+        let!(:deployment) { create(:deployment, deployable: build) }
 
-      context 'when multiple deployments are created' do
-        let!(:deployment1) { create(:deployment, deployable: build) }
-        let!(:deployment2) { create(:deployment, deployable: build) }
+        it { is_expected.to be_truthy }
+      end
 
-        it 'returns the latest one' do
-          is_expected.to eq(deployment2)
-        end
+      context 'when build does not have a deployment' do
+        it { is_expected.to be_falsy }
       end
     end
 
@@ -818,14 +901,14 @@ describe Ci::Build do
 
       context 'when build succeeded' do
         let(:build) { create(:ci_build, :success) }
-        let!(:deployment) { create(:deployment, deployable: build) }
+        let!(:deployment) { create(:deployment, :success, deployable: build) }
 
         context 'current deployment is latest' do
           it { is_expected.to be_falsey }
         end
 
         context 'current deployment is not latest on environment' do
-          let!(:deployment2) { create(:deployment, environment: deployment.environment) }
+          let!(:deployment2) { create(:deployment, :success, environment: deployment.environment) }
 
           it { is_expected.to be_truthy }
         end
@@ -3209,10 +3292,14 @@ describe Ci::Build do
   end
 
   describe '#deployment_status' do
+    before do
+      allow_any_instance_of(described_class).to receive(:create_deployment)
+    end
+
     context 'when build is a last deployment' do
       let(:build) { create(:ci_build, :success, environment: 'production') }
       let(:environment) { create(:environment, name: 'production', project: build.project) }
-      let!(:deployment) { create(:deployment, environment: environment, project: environment.project, deployable: build) }
+      let!(:deployment) { create(:deployment, :success, environment: environment, project: environment.project, deployable: build) }
 
       it { expect(build.deployment_status).to eq(:last) }
     end
@@ -3220,8 +3307,8 @@ describe Ci::Build do
     context 'when there is a newer build with deployment' do
       let(:build) { create(:ci_build, :success, environment: 'production') }
       let(:environment) { create(:environment, name: 'production', project: build.project) }
-      let!(:deployment) { create(:deployment, environment: environment, project: environment.project, deployable: build) }
-      let!(:last_deployment) { create(:deployment, environment: environment, project: environment.project) }
+      let!(:deployment) { create(:deployment, :success, environment: environment, project: environment.project, deployable: build) }
+      let!(:last_deployment) { create(:deployment, :success, environment: environment, project: environment.project) }
 
       it { expect(build.deployment_status).to eq(:out_of_date) }
     end
@@ -3229,7 +3316,7 @@ describe Ci::Build do
     context 'when build with deployment has failed' do
       let(:build) { create(:ci_build, :failed, environment: 'production') }
       let(:environment) { create(:environment, name: 'production', project: build.project) }
-      let!(:deployment) { create(:deployment, environment: environment, project: environment.project, deployable: build) }
+      let!(:deployment) { create(:deployment, :success, environment: environment, project: environment.project, deployable: build) }
 
       it { expect(build.deployment_status).to eq(:failed) }
     end
@@ -3237,14 +3324,7 @@ describe Ci::Build do
     context 'when build with deployment is running' do
       let(:build) { create(:ci_build, environment: 'production') }
       let(:environment) { create(:environment, name: 'production', project: build.project) }
-      let!(:deployment) { create(:deployment, environment: environment, project: environment.project, deployable: build) }
-
-      it { expect(build.deployment_status).to eq(:creating) }
-    end
-
-    context 'when build is successful but deployment is not ready yet' do
-      let(:build) { create(:ci_build, :success, environment: 'production') }
-      let(:environment) { create(:environment, name: 'production', project: build.project) }
+      let!(:deployment) { create(:deployment, :success, environment: environment, project: environment.project, deployable: build) }
 
       it { expect(build.deployment_status).to eq(:creating) }
     end
diff --git a/spec/models/concerns/deployable_spec.rb b/spec/models/concerns/deployable_spec.rb
new file mode 100644
index 00000000000..e30e9689717
--- /dev/null
+++ b/spec/models/concerns/deployable_spec.rb
@@ -0,0 +1,45 @@
+require 'rails_helper'
+
+describe Deployable do
+  describe '#create_deployment' do
+    let(:deployment) { job.deployment }
+    let(:environment) { deployment&.environment }
+
+    before do
+      job.reload
+    end
+
+    context 'when the deployable object will deploy to production' do
+      let!(:job) { create(:ci_build, :start_review_app) }
+
+      it 'creates a deployment and environment record' do
+        expect(deployment.project).to eq(job.project)
+        expect(deployment.ref).to eq(job.ref)
+        expect(deployment.tag).to eq(job.tag)
+        expect(deployment.sha).to eq(job.sha)
+        expect(deployment.user).to eq(job.user)
+        expect(deployment.deployable).to eq(job)
+        expect(deployment.on_stop).to eq('stop_review_app')
+        expect(environment.name).to eq('review/master')
+      end
+    end
+
+    context 'when the deployable object has already had a deployment' do
+      let!(:job) { create(:ci_build, :start_review_app, deployment: race_deployment) }
+      let!(:race_deployment) { create(:deployment, :success) }
+
+      it 'does not create a new deployment' do
+        expect(deployment).to eq(race_deployment)
+      end
+    end
+
+    context 'when the deployable object will not deploy' do
+      let!(:job) { create(:ci_build) }
+
+      it 'does not create a deployment and environment record' do
+        expect(deployment).to be_nil
+        expect(environment).to be_nil
+      end
+    end
+  end
+end
diff --git a/spec/models/deployment_spec.rb b/spec/models/deployment_spec.rb
index 146d35122f7..06c1e9c8c6a 100644
--- a/spec/models/deployment_spec.rb
+++ b/spec/models/deployment_spec.rb
@@ -42,16 +42,174 @@ describe Deployment do
     end
   end
 
-  describe 'after_create callbacks' do
-    let(:environment) { create(:environment) }
-    let(:store) { Gitlab::EtagCaching::Store.new }
+  describe '.success' do
+    subject { described_class.success }
 
-    it 'invalidates the environment etag cache' do
-      old_value = store.get(environment.etag_cache_key)
+    context 'when deployment status is success' do
+      let(:deployment) { create(:deployment, :success) }
 
-      create(:deployment, environment: environment)
+      it { is_expected.to eq([deployment]) }
+    end
+
+    context 'when deployment status is created' do
+      let(:deployment) { create(:deployment, :created) }
+
+      it { is_expected.to be_empty }
+    end
+
+    context 'when deployment status is running' do
+      let(:deployment) { create(:deployment, :running) }
+
+      it { is_expected.to be_empty }
+    end
+  end
+
+  describe 'state machine' do
+    context 'when deployment runs' do
+      let(:deployment) { create(:deployment) }
+
+      before do
+        deployment.run!
+      end
+
+      it 'starts running' do
+        Timecop.freeze do
+          expect(deployment).to be_running
+          expect(deployment.finished_at).to be_nil
+        end
+      end
+    end
+
+    context 'when deployment succeeded' do
+      let(:deployment) { create(:deployment, :running) }
+
+      it 'has correct status' do
+        Timecop.freeze do
+          deployment.succeed!
+
+          expect(deployment).to be_success
+          expect(deployment.finished_at).to eq(Time.now)
+        end
+      end
+
+      it 'executes Deployments::SuccessWorker asynchronously' do
+        expect(Deployments::SuccessWorker)
+          .to receive(:perform_async).with(deployment.id)
 
-      expect(store.get(environment.etag_cache_key)).not_to eq(old_value)
+        deployment.succeed!
+      end
+    end
+
+    context 'when deployment failed' do
+      let(:deployment) { create(:deployment, :running) }
+
+      it 'has correct status' do
+        Timecop.freeze do
+          deployment.drop!
+
+          expect(deployment).to be_failed
+          expect(deployment.finished_at).to eq(Time.now)
+        end
+      end
+    end
+
+    context 'when deployment was canceled' do
+      let(:deployment) { create(:deployment, :running) }
+
+      it 'has correct status' do
+        Timecop.freeze do
+          deployment.cancel!
+
+          expect(deployment).to be_canceled
+          expect(deployment.finished_at).to eq(Time.now)
+        end
+      end
+    end
+  end
+
+  describe '#success?' do
+    subject { deployment.success? }
+
+    context 'when deployment status is success' do
+      let(:deployment) { create(:deployment, :success) }
+
+      it { is_expected.to be_truthy }
+    end
+
+    context 'when deployment status is failed' do
+      let(:deployment) { create(:deployment, :failed) }
+
+      it { is_expected.to be_falsy }
+    end
+  end
+
+  describe '#status_name' do
+    subject { deployment.status_name }
+
+    context 'when deployment status is success' do
+      let(:deployment) { create(:deployment, :success) }
+
+      it { is_expected.to eq(:success) }
+    end
+
+    context 'when deployment status is failed' do
+      let(:deployment) { create(:deployment, :failed) }
+
+      it { is_expected.to eq(:failed) }
+    end
+  end
+
+  describe '#finished_at' do
+    subject { deployment.finished_at }
+
+    context 'when deployment status is created' do
+      let(:deployment) { create(:deployment) }
+
+      it { is_expected.to be_nil }
+    end
+
+    context 'when deployment status is success' do
+      let(:deployment) { create(:deployment, :success) }
+
+      it { is_expected.to eq(deployment.read_attribute(:finished_at)) }
+    end
+
+    context 'when deployment status is success' do
+      let(:deployment) { create(:deployment, :success, finished_at: nil) }
+
+      before do
+        deployment.update_column(:finished_at, nil)
+      end
+
+      it { is_expected.to eq(deployment.read_attribute(:created_at)) }
+    end
+
+    context 'when deployment status is running' do
+      let(:deployment) { create(:deployment, :running) }
+
+      it { is_expected.to be_nil }
+    end
+  end
+
+  describe '#deployed_at' do
+    subject { deployment.deployed_at }
+
+    context 'when deployment status is created' do
+      let(:deployment) { create(:deployment) }
+
+      it { is_expected.to be_nil }
+    end
+
+    context 'when deployment status is success' do
+      let(:deployment) { create(:deployment, :success) }
+
+      it { is_expected.to eq(deployment.read_attribute(:finished_at)) }
+    end
+
+    context 'when deployment status is running' do
+      let(:deployment) { create(:deployment, :running) }
+
+      it { is_expected.to be_nil }
     end
   end
 
@@ -112,7 +270,7 @@ describe Deployment do
   end
 
   describe '#metrics' do
-    let(:deployment) { create(:deployment) }
+    let(:deployment) { create(:deployment, :success) }
     let(:prometheus_adapter) { double('prometheus_adapter', can_query?: true) }
 
     subject { deployment.metrics }
@@ -141,7 +299,7 @@ describe Deployment do
 
   describe '#additional_metrics' do
     let(:project) { create(:project, :repository) }
-    let(:deployment) { create(:deployment, project: project) }
+    let(:deployment) { create(:deployment, :succeed, project: project) }
 
     subject { deployment.additional_metrics }
 
diff --git a/spec/models/environment_spec.rb b/spec/models/environment_spec.rb
index 1de95d881a7..e121369f6ac 100644
--- a/spec/models/environment_spec.rb
+++ b/spec/models/environment_spec.rb
@@ -95,7 +95,7 @@ describe Environment do
 
     context 'with a last deployment' do
       let!(:deployment) do
-        create(:deployment, environment: environment, sha: project.commit('master').id)
+        create(:deployment, :success, environment: environment, sha: project.commit('master').id)
       end
 
       context 'in the same branch' do
@@ -136,8 +136,8 @@ describe Environment do
 
   describe '#first_deployment_for' do
     let(:project)       { create(:project, :repository) }
-    let!(:deployment)   { create(:deployment, environment: environment, ref: commit.parent.id) }
-    let!(:deployment1)  { create(:deployment, environment: environment, ref: commit.id) }
+    let!(:deployment)   { create(:deployment, :succeed, environment: environment, ref: commit.parent.id) }
+    let!(:deployment1)  { create(:deployment, :succeed, environment: environment, ref: commit.id) }
     let(:head_commit)   { project.commit }
     let(:commit)        { project.commit.parent }
 
@@ -181,7 +181,8 @@ describe Environment do
       let(:build) { create(:ci_build) }
 
       let!(:deployment) do
-        create(:deployment, environment: environment,
+        create(:deployment, :success,
+                            environment: environment,
                             deployable: build,
                             on_stop: 'close_app')
       end
@@ -249,7 +250,8 @@ describe Environment do
       let(:build) { create(:ci_build, pipeline: pipeline) }
 
       let!(:deployment) do
-        create(:deployment, environment: environment,
+        create(:deployment, :success,
+                            environment: environment,
                             deployable: build,
                             on_stop: 'close_app')
       end
@@ -304,7 +306,7 @@ describe Environment do
 
     context 'when last deployment to environment is the most recent one' do
       before do
-        create(:deployment, environment: environment, ref: 'feature')
+        create(:deployment, :success, environment: environment, ref: 'feature')
       end
 
       it { is_expected.to be true }
@@ -312,8 +314,8 @@ describe Environment do
 
     context 'when last deployment to environment is not the most recent' do
       before do
-        create(:deployment, environment: environment, ref: 'feature')
-        create(:deployment, environment: environment, ref: 'master')
+        create(:deployment, :success, environment: environment, ref: 'feature')
+        create(:deployment, :success, environment: environment, ref: 'master')
       end
 
       it { is_expected.to be false }
@@ -321,7 +323,7 @@ describe Environment do
   end
 
   describe '#actions_for' do
-    let(:deployment) { create(:deployment, environment: environment) }
+    let(:deployment) { create(:deployment, :success, environment: environment) }
     let(:pipeline) { deployment.deployable.pipeline }
     let!(:review_action) { create(:ci_build, :manual, name: 'review-apps', pipeline: pipeline, environment: 'review/$CI_COMMIT_REF_NAME' )}
     let!(:production_action) { create(:ci_build, :manual, name: 'production', pipeline: pipeline, environment: 'production' )}
@@ -331,6 +333,70 @@ describe Environment do
     end
   end
 
+  describe '.deployments' do
+    subject { environment.deployments }
+
+    context 'when there is a deployment record with created status' do
+      let(:deployment) { create(:deployment, :created, environment: environment) }
+
+      it 'does not return the record' do
+        is_expected.to be_empty
+      end
+    end
+
+    context 'when there is a deployment record with running status' do
+      let(:deployment) { create(:deployment, :running, environment: environment) }
+
+      it 'does not return the record' do
+        is_expected.to be_empty
+      end
+    end
+
+    context 'when there is a deployment record with success status' do
+      let(:deployment) { create(:deployment, :success, environment: environment) }
+
+      it 'returns the record' do
+        is_expected.to eq([deployment])
+      end
+    end
+  end
+
+  describe '.last_deployment' do
+    subject { environment.last_deployment }
+
+    before do
+      allow_any_instance_of(Deployment).to receive(:create_ref)
+    end
+
+    context 'when there is an old deployment record' do
+      let!(:previous_deployment) { create(:deployment, :success, environment: environment) }
+
+      context 'when there is a deployment record with created status' do
+        let!(:deployment) { create(:deployment, environment: environment) }
+
+        it 'returns the previous deployment' do
+          is_expected.to eq(previous_deployment)
+        end
+      end
+
+      context 'when there is a deployment record with running status' do
+        let!(:deployment) { create(:deployment, :running, environment: environment) }
+
+        it 'returns the previous deployment' do
+          is_expected.to eq(previous_deployment)
+        end
+      end
+
+      context 'when there is a deployment record with success status' do
+        let!(:deployment) { create(:deployment, :success, environment: environment) }
+
+        it 'returns the latest successful deployment' do
+          is_expected.to eq(deployment)
+        end
+      end
+    end
+  end
+
   describe '#has_terminals?' do
     subject { environment.has_terminals? }
 
@@ -338,7 +404,7 @@ describe Environment do
       context 'with a deployment service' do
         shared_examples 'same behavior between KubernetesService and Platform::Kubernetes' do
           context 'and a deployment' do
-            let!(:deployment) { create(:deployment, environment: environment) }
+            let!(:deployment) { create(:deployment, :success, environment: environment) }
             it { is_expected.to be_truthy }
           end
 
diff --git a/spec/models/environment_status_spec.rb b/spec/models/environment_status_spec.rb
index e7805d52d75..52b98552184 100644
--- a/spec/models/environment_status_spec.rb
+++ b/spec/models/environment_status_spec.rb
@@ -1,7 +1,7 @@
 require 'spec_helper'
 
 describe EnvironmentStatus do
-  let(:deployment)    { create(:deployment, :review_app) }
+  let(:deployment)    { create(:deployment, :succeed, :review_app) }
   let(:environment)   { deployment.environment}
   let(:project)       { deployment.project }
   let(:merge_request) { create(:merge_request, :deployed_review_app, deployment: deployment) }
@@ -12,7 +12,7 @@ describe EnvironmentStatus do
   it { is_expected.to delegate_method(:id).to(:environment) }
   it { is_expected.to delegate_method(:name).to(:environment) }
   it { is_expected.to delegate_method(:project).to(:environment) }
-  it { is_expected.to delegate_method(:deployed_at).to(:deployment).as(:created_at) }
+  it { is_expected.to delegate_method(:deployed_at).to(:deployment) }
   it { is_expected.to delegate_method(:status).to(:deployment) }
 
   describe '#project' do
diff --git a/spec/models/merge_request_spec.rb b/spec/models/merge_request_spec.rb
index 2eb5e39ccfd..3a54725c7ec 100644
--- a/spec/models/merge_request_spec.rb
+++ b/spec/models/merge_request_spec.rb
@@ -1836,8 +1836,8 @@ describe MergeRequest do
       let(:environments) { create_list(:environment, 3, project: project) }
 
       before do
-        create(:deployment, environment: environments.first, ref: 'master', sha: project.commit('master').id)
-        create(:deployment, environment: environments.second, ref: 'feature', sha: project.commit('feature').id)
+        create(:deployment, :success, environment: environments.first, ref: 'master', sha: project.commit('master').id)
+        create(:deployment, :success, environment: environments.second, ref: 'feature', sha: project.commit('feature').id)
       end
 
       it 'selects deployed environments' do
@@ -1857,7 +1857,7 @@ describe MergeRequest do
       let(:source_environment) { create(:environment, project: source_project) }
 
       before do
-        create(:deployment, environment: source_environment, ref: 'feature', sha: merge_request.diff_head_sha)
+        create(:deployment, :success, environment: source_environment, ref: 'feature', sha: merge_request.diff_head_sha)
       end
 
       it 'selects deployed environments' do
@@ -1868,7 +1868,7 @@ describe MergeRequest do
         let(:target_environment) { create(:environment, project: project) }
 
         before do
-          create(:deployment, environment: target_environment, tag: true, sha: merge_request.diff_head_sha)
+          create(:deployment, :success, environment: target_environment, tag: true, sha: merge_request.diff_head_sha)
         end
 
         it 'selects deployed environments' do
diff --git a/spec/models/project_spec.rb b/spec/models/project_spec.rb
index 84326724118..f020557e4af 100644
--- a/spec/models/project_spec.rb
+++ b/spec/models/project_spec.rb
@@ -3976,6 +3976,40 @@ describe Project do
     end
   end
 
+  describe '.deployments' do
+    subject { project.deployments }
+
+    let(:project) { create(:project) }
+
+    before do
+      allow_any_instance_of(Deployment).to receive(:create_ref)
+    end
+
+    context 'when there is a deployment record with created status' do
+      let(:deployment) { create(:deployment, :created, project: project) }
+
+      it 'does not return the record' do
+        is_expected.to be_empty
+      end
+    end
+
+    context 'when there is a deployment record with running status' do
+      let(:deployment) { create(:deployment, :running, project: project) }
+
+      it 'does not return the record' do
+        is_expected.to be_empty
+      end
+    end
+
+    context 'when there is a deployment record with success status' do
+      let(:deployment) { create(:deployment, :success, project: project) }
+
+      it 'returns the record' do
+        is_expected.to eq([deployment])
+      end
+    end
+  end
+
   def rugged_config
     rugged_repo(project.repository).config
   end