2 files changed, 27 insertions, 10 deletions
diff --git a/app/models/ci/build.rb b/app/models/ci/build.rb
index 096b3b801af..61052437318 100644
--- a/app/models/ci/build.rb
+++ b/app/models/ci/build.rb
@@ -208,22 +208,31 @@ module Ci
       end
     end
 
+    def has_trace_file?
+      File.exist?(path_to_trace) || has_old_trace_file?
+    end
+
     def has_trace?
       raw_trace.present?
     end
 
     def raw_trace
-      if File.file?(path_to_trace)
-        File.read(path_to_trace)
-      elsif project.ci_id && File.file?(old_path_to_trace)
-        # Temporary fix for build trace data integrity
-        File.read(old_path_to_trace)
+      if File.exist?(trace_file_path)
+        File.read(trace_file_path)
       else
         # backward compatibility
         read_attribute :trace
       end
     end
 
+    ##
+    # Deprecated
+    #
+    # This is a hotfix for CI build data integrity, see #4246
+    def has_old_trace_file?
+      project.ci_id && File.exist?(old_path_to_trace)
+    end
+
     def trace
       trace = raw_trace
       if project && trace.present? && project.runners_token.present?
@@ -262,6 +271,14 @@ module Ci
       end
     end
 
+    def trace_file_path
+      if has_old_trace_file?
+        old_path_to_trace
+      else
+        path_to_trace
+      end
+    end
+
     def dir_to_trace
       File.join(
         Settings.gitlab_ci.builds_path,
@@ -352,7 +369,7 @@ module Ci
     end
 
     def artifacts?
-      !artifacts_expired? && artifacts_file.exists?
+      !artifacts_expired? && self[:artifacts_file].present?
     end
 
     def artifacts_metadata?
diff --git a/app/models/ci/pipeline.rb b/app/models/ci/pipeline.rb
index 087abe4cbb1..bd1737c7587 100644
--- a/app/models/ci/pipeline.rb
+++ b/app/models/ci/pipeline.rb
@@ -1,7 +1,7 @@
 module Ci
   class Pipeline < ActiveRecord::Base
     extend Ci::Model
-    include Statuseable
+    include HasStatus
 
     self.table_name = 'ci_commits'
 
@@ -65,8 +65,8 @@ module Ci
     end
 
     # ref can't be HEAD or SHA, can only be branch/tag name
-    scope :latest_successful_for, ->(ref = default_branch) do
-      where(ref: ref).success.order(id: :desc).limit(1)
+    def self.latest_successful_for(ref)
+      where(ref: ref).order(id: :desc).success.first
     end
 
     def self.truncate_sha(sha)
@@ -83,7 +83,7 @@ module Ci
     end
 
     def stages_with_latest_statuses
-      statuses.latest.order(:stage_idx).group_by(&:stage)
+      statuses.latest.includes(project: :namespace).order(:stage_idx).group_by(&:stage)
     end
 
     def project_id