1 files changed, 19 insertions, 4 deletions
diff --git a/activerecord/lib/active_record/fixture_set/file.rb b/activerecord/lib/active_record/fixture_set/file.rb
index 8132310c91..f969556c50 100644
--- a/activerecord/lib/active_record/fixture_set/file.rb
+++ b/activerecord/lib/active_record/fixture_set/file.rb
@@ -17,24 +17,39 @@ module ActiveRecord
 
       def initialize(file)
         @file = file
-        @rows = nil
       end
 
       def each(&block)
         rows.each(&block)
       end
 
+      def model_class
+        config_row['model_class']
+      end
 
       private
         def rows
-          return @rows if @rows
+          @rows ||= raw_rows.reject { |fixture_name, _| fixture_name == '_fixture' }
+        end
+
+        def config_row
+          @config_row ||= begin
+            row = raw_rows.find { |fixture_name, _| fixture_name == '_fixture' }
+            if row
+              row.last
+            else
+              {'model_class': nil}
+            end
+          end
+        end
 
-          begin
+        def raw_rows
+          @raw_rows ||= begin
             data = YAML.load(render(IO.read(@file)))
+            data ? validate(data).to_a : []
           rescue ArgumentError, Psych::SyntaxError => error
             raise Fixture::FormatError, "a YAML error occurred parsing #{@file}. Please note that YAML must be consistently indented using spaces. Tabs are not allowed. Please have a look at http://www.yaml.org/faq.html\nThe exact error was:\n  #{error.class}: #{error}", error.backtrace
           end
-          @rows = data ? validate(data).to_a : []
         end
 
         def render(content)