1 files changed, 65 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/fixtures/file.rb b/activerecord/lib/active_record/fixtures/file.rb
new file mode 100644
index 0000000000..6bad36abb9
--- /dev/null
+++ b/activerecord/lib/active_record/fixtures/file.rb
@@ -0,0 +1,65 @@
+begin
+  require 'psych'
+rescue LoadError
+end
+
+require 'erb'
+require 'yaml'
+
+module ActiveRecord
+  class Fixtures
+    class File
+      include Enumerable
+
+      ##
+      # Open a fixture file named +file+.  When called with a block, the block
+      # is called with the filehandle and the filehandle is automatically closed
+      # when the block finishes.
+      def self.open(file)
+        x = new file
+        block_given? ? yield(x) : x
+      end
+
+      def initialize(file)
+        @file = file
+        @rows = nil
+      end
+
+      def each(&block)
+        rows.each(&block)
+      end
+
+      RESCUE_ERRORS = [ ArgumentError ] # :nodoc:
+
+      private
+      if defined?(Psych) && defined?(Psych::SyntaxError)
+        RESCUE_ERRORS << Psych::SyntaxError
+      end
+
+      def rows
+        return @rows if @rows
+
+        begin
+          data = YAML.load(render(IO.read(@file)))
+        rescue *RESCUE_ERRORS => 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)
+        ERB.new(content).result
+      end
+
+      # Validate our unmarshalled data.
+      def validate(data)
+        unless Hash === data || YAML::Omap === data
+          raise Fixture::FormatError, 'fixture is not a hash'
+        end
+
+        raise Fixture::FormatError unless data.all? { |name, row| Hash === row }
+        data
+      end
+    end
+  end
+end