Merge branch 'fix/gb/improve-stage-id-foreign-key-migration' into 'master'

Improve stage_id foreign key migration

Closes #34495

See merge request !12617

db/migrate/20170703102400_add_stage_id_foreign_key_to_builds.rb

+class AddStageIdForeignKeyToBuilds < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    unless index_exists?(:ci_builds, :stage_id)
+      add_concurrent_index(:ci_builds, :stage_id)
+    end
+
+    unless foreign_key_exists?(:ci_builds, :stage_id)
+      add_concurrent_foreign_key(:ci_builds, :ci_stages, column: :stage_id, on_delete: :cascade)
+    end
+  end
+
+  def down
+    if foreign_key_exists?(:ci_builds, :stage_id)
+      remove_foreign_key(:ci_builds, column: :stage_id)
+    end
+
+    if index_exists?(:ci_builds, :stage_id)
+      remove_concurrent_index(:ci_builds, :stage_id)
+    end
+  end
+
+  private
+
+  def foreign_key_exists?(table, column)
+    foreign_keys(:ci_builds).any? do |key|
+      key.options[:column] == column.to_s
+    end
+  end
+end

db/post_migrate/20170621102400_add_stage_id_index_to_builds.rb

@@ -3,19 +3,15 @@ class AddStageIdIndexToBuilds < ActiveRecord::Migration
 
   DOWNTIME = false
 
-  disable_ddl_transaction!
+  ##
+  # Improved in 20170703102400_add_stage_id_foreign_key_to_builds.rb
+  #
 
   def up
-    unless index_exists?(:ci_builds, :stage_id)
-      add_concurrent_foreign_key(:ci_builds, :ci_stages, column: :stage_id, on_delete: :cascade)
-      add_concurrent_index(:ci_builds, :stage_id)
-    end
+    # noop
   end
 
   def down
-    if index_exists?(:ci_builds, :stage_id)
-      remove_foreign_key(:ci_builds, column: :stage_id)
-      remove_concurrent_index(:ci_builds, :stage_id)
-    end
+    # noop
   end
 end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170623080805) do
+ActiveRecord::Schema.define(version: 20170703102400) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"