2 files changed, 67 insertions, 0 deletions
diff --git a/rubocop/cop/activerecord_serialize.rb b/rubocop/cop/activerecord_serialize.rb
new file mode 100644
index 00000000000..bfa0cff9a67
--- /dev/null
+++ b/rubocop/cop/activerecord_serialize.rb
@@ -0,0 +1,24 @@
+module RuboCop
+  module Cop
+    # Cop that prevents the use of `serialize` in ActiveRecord models.
+    class ActiverecordSerialize < RuboCop::Cop::Cop
+      MSG = 'Do not store serialized data in the database, use separate columns and/or tables instead'.freeze
+
+      def on_send(node)
+        return unless in_models?(node)
+
+        add_offense(node, :selector) if node.children[1] == :serialize
+      end
+
+      def models_path
+        File.join(Dir.pwd, 'app', 'models')
+      end
+
+      def in_models?(node)
+        path = node.location.expression.source_buffer.name
+
+        path.start_with?(models_path)
+      end
+    end
+  end
+end
diff --git a/rubocop/cop/migration/update_column_in_batches.rb b/rubocop/cop/migration/update_column_in_batches.rb
new file mode 100644
index 00000000000..3f886cbfea3
--- /dev/null
+++ b/rubocop/cop/migration/update_column_in_batches.rb
@@ -0,0 +1,43 @@
+require_relative '../../migration_helpers'
+
+module RuboCop
+  module Cop
+    module Migration
+      # Cop that checks if a spec file exists for any migration using
+      # `update_column_in_batches`.
+      class UpdateColumnInBatches < RuboCop::Cop::Cop
+        include MigrationHelpers
+
+        MSG = 'Migration running `update_column_in_batches` must have a spec file at' \
+          ' `%s`.'.freeze
+
+        def on_send(node)
+          return unless in_migration?(node)
+          return unless node.children[1] == :update_column_in_batches
+
+          spec_path = spec_filename(node)
+
+          unless File.exist?(File.expand_path(spec_path, rails_root))
+            add_offense(node, :expression, format(MSG, spec_path))
+          end
+        end
+
+        private
+
+        def spec_filename(node)
+          source_name = node.location.expression.source_buffer.name
+          path = Pathname.new(source_name).relative_path_from(rails_root)
+          dirname = File.dirname(path)
+            .sub(%r{\Adb/(migrate|post_migrate)}, 'spec/migrations')
+          filename = File.basename(source_name, '.rb').sub(%r{\A\d+_}, '')
+
+          File.join(dirname, "#{filename}_spec.rb")
+        end
+
+        def rails_root
+          Pathname.new(File.expand_path('../../..', __dir__))
+        end
+      end
+    end
+  end
+end