Merge branch 'blackst0ne-rails5-update-active-record-locking-initializer' into 'master'

[Rails5] Update active_record_locking initializer

See merge request gitlab-org/gitlab-ce!17824

config/initializers/active_record_locking.rb

 # rubocop:disable Lint/RescueException
-# This patch fixes https://github.com/rails/rails/issues/26024
-# TODO: Remove it when it's no longer necessary
-
-module ActiveRecord
-  module Locking
-    module Optimistic
-      # We overwrite this method because we don't want to have default value
-      # for newly created records
-      def _create_record(attribute_names = self.attribute_names, *) # :nodoc:
-        super
-      end
-      def _update_record(attribute_names = self.attribute_names) #:nodoc:
-        return super unless locking_enabled?
-        return 0 if attribute_names.empty?
-        lock_col = self.class.locking_column
-        previous_lock_value = send(lock_col).to_i # rubocop:disable GitlabSecurity/PublicSend
-        # This line is added as a patch
-        previous_lock_value = nil if previous_lock_value == '0' || previous_lock_value == 0
-        increment_lock
-        attribute_names += [lock_col]
-        attribute_names.uniq!
-        begin
-          relation = self.class.unscoped
-          affected_rows = relation.where(
-            self.class.primary_key => id,
-            lock_col => previous_lock_value
-          ).update_all(
-            attributes_for_update(attribute_names).map do |name|
-              [name, _read_attribute(name)]
-            end.to_h
-          )
-          unless affected_rows == 1
-            raise ActiveRecord::StaleObjectError.new(self, "update")
-          end
-          affected_rows
-        # If something went wrong, revert the version.
-        rescue Exception
-          send(lock_col + '=', previous_lock_value)  # rubocop:disable GitlabSecurity/PublicSend
-          raise
+# Remove this entire initializer when we are at rails 5.0.
+# This file fixes the bug (see below) which has been fixed in the upstream.
+unless Gitlab.rails5?
+  # This patch fixes https://github.com/rails/rails/issues/26024
+  # TODO: Remove it when it's no longer necessary
+
+  module ActiveRecord
+    module Locking
+      module Optimistic
+        # We overwrite this method because we don't want to have default value
+        # for newly created records
+        def _create_record(attribute_names = self.attribute_names, *) # :nodoc:
+          super
+        end
+        def _update_record(attribute_names = self.attribute_names) #:nodoc:
+          return super unless locking_enabled?
+          return 0 if attribute_names.empty?
+          lock_col = self.class.locking_column
+          previous_lock_value = send(lock_col).to_i # rubocop:disable GitlabSecurity/PublicSend
+          # This line is added as a patch
+          previous_lock_value = nil if previous_lock_value == '0' || previous_lock_value == 0
+          increment_lock
+          attribute_names += [lock_col]
+          attribute_names.uniq!
+          begin
+            relation = self.class.unscoped
+            affected_rows = relation.where(
+              self.class.primary_key => id,
+              lock_col => previous_lock_value
+            ).update_all(
+              attributes_for_update(attribute_names).map do |name|
+                [name, _read_attribute(name)]
+              end.to_h
+            )
+            unless affected_rows == 1
+              raise ActiveRecord::StaleObjectError.new(self, "update")
+            end
+            affected_rows
+          # If something went wrong, revert the version.
+          rescue Exception
+            send(lock_col + '=', previous_lock_value)  # rubocop:disable GitlabSecurity/PublicSend
+            raise
+          end
         end
-      end
-      # This is patched because we need it to query `lock_version IS NULL`
-      # rather than `lock_version = 0` whenever lock_version is NULL.
-      def relation_for_destroy
-        return super unless locking_enabled?
-        column_name = self.class.locking_column
-        super.where(self.class.arel_table[column_name].eq(self[column_name]))
+        # This is patched because we need it to query `lock_version IS NULL`
+        # rather than `lock_version = 0` whenever lock_version is NULL.
+        def relation_for_destroy
+          return super unless locking_enabled?
+          column_name = self.class.locking_column
+          super.where(self.class.arel_table[column_name].eq(self[column_name]))
+        end
       end
-    end
-    # This is patched because we want `lock_version` default to `NULL`
-    # rather than `0`
-    class LockingType < SimpleDelegator
-      def type_cast_from_database(value)
-        super
+      # This is patched because we want `lock_version` default to `NULL`
+      # rather than `0`
+      class LockingType < SimpleDelegator
+        def type_cast_from_database(value)
+          super
+        end
       end
     end
   end