Revert rename allow collaboration column

app/models/merge_request.rb

@@ -1125,8 +1125,11 @@ class MergeRequest < ActiveRecord::Base
     project.merge_requests.merged.where(author_id: author_id).empty?
   end
+  # TODO: remove once production database rename completes
+  alias_attribute :allow_collaboration, :allow_maintainer_to_push
+
   def allow_collaboration
-    collaborative_push_possible? && super
+    collaborative_push_possible? && allow_maintainer_to_push
   end
   alias_method :allow_collaboration?, :allow_collaboration

db/migrate/20180523042841_rename_merge_requests_allow_maintainer_to_push.rb

@@ -6,10 +6,12 @@ class RenameMergeRequestsAllowMaintainerToPush < ActiveRecord::Migration
   disable_ddl_transaction!
   def up
-    rename_column_concurrently :merge_requests, :allow_maintainer_to_push, :allow_collaboration
+    # NOOP
   end
   def down
-    cleanup_concurrent_column_rename :merge_requests, :allow_collaboration, :allow_maintainer_to_push
+    if column_exists?(:merge_requests, :allow_collaboration)
+      cleanup_concurrent_column_rename :merge_requests, :allow_collaboration, :allow_maintainer_to_push
+    end
   end
 end

db/migrate/20180608110058_rename_merge_requests_allow_collaboration.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class RenameMergeRequestsAllowCollaboration < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    if column_exists?(:merge_requests, :allow_collaboration)
+      rename_column_concurrently :merge_requests, :allow_collaboration, :allow_maintainer_to_push
+    end
+  end
+
+  def down
+    # NOOP
+  end
+end

db/post_migrate/20180523125103_cleanup_merge_requests_allow_maintainer_to_push_rename.rb

@@ -6,10 +6,12 @@ class CleanupMergeRequestsAllowMaintainerToPushRename < ActiveRecord::Migration
   disable_ddl_transaction!
   def up
-    cleanup_concurrent_column_rename :merge_requests, :allow_maintainer_to_push, :allow_collaboration
+    # NOOP
   end
   def down
-    rename_column_concurrently :merge_requests, :allow_collaboration, :allow_maintainer_to_push
+    if column_exists?(:merge_requests, :allow_collaboration)
+      rename_column_concurrently :merge_requests, :allow_collaboration, :allow_maintainer_to_push
+    end
   end
 end

db/post_migrate/20180608201435_cleanup_merge_requests_allow_collaboration_rename.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class CleanupMergeRequestsAllowCollaborationRename < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    if column_exists?(:merge_requests, :allow_collaboration)
+      cleanup_concurrent_column_rename :merge_requests, :allow_collaboration, :allow_maintainer_to_push
+    end
+  end
+
+  def down
+    # 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: 20180603190921) do
+ActiveRecord::Schema.define(version: 20180608201435) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -1231,8 +1231,8 @@ ActiveRecord::Schema.define(version: 20180603190921) do
     t.boolean "discussion_locked"
     t.integer "latest_merge_request_diff_id"
     t.string "rebase_commit_sha"
-    t.boolean "allow_collaboration"
     t.boolean "squash", default: false, null: false
+    t.boolean "allow_maintainer_to_push"
   end
   add_index "merge_requests", ["assignee_id"], name: "index_merge_requests_on_assignee_id", using: :btree

spec/lib/gitlab/import_export/safe_model_attributes.yml

@@ -170,7 +170,7 @@ MergeRequest:
 - last_edited_by_id
 - head_pipeline_id
 - discussion_locked
-- allow_collaboration
+- allow_maintainer_to_push
 MergeRequestDiff:
 - id
 - state