Merge pull request #9975 from mmangino/raise_when_attributes_cant_be_unserialized

Unserializing YAML attributes can silently fail in development mode

activerecord/lib/active_record/coders/yaml_column.rb

@@ -23,19 +23,15 @@ module ActiveRecord
       def load(yaml)
         return object_class.new if object_class != Object && yaml.nil?
         return yaml unless yaml.is_a?(String) && yaml =~ /^---/
-        begin
-          obj = YAML.load(yaml)
+        obj = YAML.load(yaml)
 
-          unless obj.is_a?(object_class) || obj.nil?
-            raise SerializationTypeMismatch,
-              "Attribute was supposed to be a #{object_class}, but was a #{obj.class}"
-          end
-          obj ||= object_class.new if object_class != Object
-
-          obj
-        rescue ArgumentError, Psych::SyntaxError
-          yaml
+        unless obj.is_a?(object_class) || obj.nil?
+          raise SerializationTypeMismatch,
+            "Attribute was supposed to be a #{object_class}, but was a #{obj.class}"
         end
+        obj ||= object_class.new if object_class != Object
+
+        obj
       end
     end
   end

activerecord/test/cases/coders/yaml_column_test.rb

@@ -43,10 +43,20 @@ module ActiveRecord
         assert_equal [], coder.load([])
       end
 
-      def test_load_swallows_yaml_exceptions
+      def test_load_doesnt_swallow_yaml_exceptions
         coder = YAMLColumn.new
         bad_yaml = '--- {'
-        assert_equal bad_yaml, coder.load(bad_yaml)
+        assert_raises(Psych::SyntaxError) do
+          coder.load(bad_yaml)
+        end
+      end
+
+      def test_load_doesnt_handle_undefined_class_or_module
+        coder = YAMLColumn.new
+        missing_class_yaml = '--- !ruby/object:DoesNotExistAndShouldntEver {}\n'
+        assert_raises(ArgumentError) do
+          coder.load(missing_class_yaml)
+        end
       end
     end
   end