1 files changed, 40 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/fixture_set/model_metadata.rb b/activerecord/lib/active_record/fixture_set/model_metadata.rb
new file mode 100644
index 0000000000..edc03939c8
--- /dev/null
+++ b/activerecord/lib/active_record/fixture_set/model_metadata.rb
@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+module ActiveRecord
+  class FixtureSet
+    class ModelMetadata # :nodoc:
+      def initialize(model_class, table_name)
+        @model_class = model_class
+        @table_name  = table_name
+      end
+
+      def primary_key_name
+        @primary_key_name ||= @model_class && @model_class.primary_key
+      end
+
+      def primary_key_type
+        @primary_key_type ||= @model_class && @model_class.type_for_attribute(@model_class.primary_key).type
+      end
+
+      def has_primary_key_column?
+        @has_primary_key_column ||= primary_key_name &&
+          @model_class.columns.any? { |col| col.name == primary_key_name }
+      end
+
+      def timestamp_column_names
+        @timestamp_column_names ||=
+          %w(created_at created_on updated_at updated_on) & column_names
+      end
+
+      def inheritance_column_name
+        @inheritance_column_name ||= @model_class && @model_class.inheritance_column
+      end
+
+      private
+
+        def column_names
+          @column_names ||= @model_class.connection.columns(@table_name).collect(&:name)
+        end
+    end
+  end
+end