From 58643cd5325f731799686daca8e1d9806851c320 Mon Sep 17 00:00:00 2001
From: Sean McGivern <sean@gitlab.com>
Date: Fri, 15 Mar 2019 19:28:00 +0000
Subject: Send schema cache to Sentry on MissingAttributeError

We don't know why this happens, so this is an attempt to debug the
issue by sending a full list of all columns ActiveRecord knows about
when the error is raised.
---
 Gemfile.lock                  |  2 +-
 config/initializers/sentry.rb | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/Gemfile.lock b/Gemfile.lock
index ec34d3f9d67..ac7e3cf4459 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -813,7 +813,7 @@ GEM
     selenium-webdriver (3.12.0)
       childprocess (~> 0.5)
       rubyzip (~> 1.2)
-    sentry-raven (2.7.4)
+    sentry-raven (2.9.0)
       faraday (>= 0.7.6, < 1.0)
     settingslogic (2.0.9)
     sexp_processor (4.11.0)
diff --git a/config/initializers/sentry.rb b/config/initializers/sentry.rb
index abc91c3ae51..680cfa6f0ed 100644
--- a/config/initializers/sentry.rb
+++ b/config/initializers/sentry.rb
@@ -20,6 +20,21 @@ def configure_sentry
       # Sanitize authentication headers
       config.sanitize_http_headers = %w[Authorization Private-Token]
       config.tags = { program: Gitlab.process_name }
+      # Debugging for https://gitlab.com/gitlab-org/gitlab-ce/issues/57727
+      config.before_send = lambda do |event, hint|
+        if ActiveModel::MissingAttributeError === hint[:exception]
+          columns_hash = ActiveRecord::Base
+                           .connection
+                           .schema_cache
+                           .instance_variable_get(:@columns_hash)
+                           .map { |k, v| [k, v.map(&:first)] }
+                           .to_h
+
+          event.extra.merge!(columns_hash)
+        end
+
+        event
+      end
     end
   end
 end
-- 
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