Make InstanceTagMethods#value_before_type_cast raise if the model don't respond to attr_before_type_cast or attr method

[#3374] [#5471 state:committed]

actionpack/lib/action_view/helpers/form_helper.rb

@@ -1006,9 +1006,14 @@ module ActionView
 
         def value_before_type_cast(object, method_name)
           unless object.nil?
-            object.respond_to?(method_name) ?
-            object.send(method_name) :
-            object.send(method_name + "_before_type_cast")
+            if object.respond_to?(method_name)
+              object.send(method_name)
+            # FIXME: this is AR dependent
+            elsif object.respond_to?(method_name + "_before_type_cast")
+              object.send(method_name + "_before_type_cast")
+            else
+              raise NoMethodError, "Model #{object.class} does not respond to #{method_name}"
+            end
           end
         end
 

actionpack/test/template/form_helper_test.rb

@@ -12,6 +12,8 @@ class FormHelperTest < ActionView::TestCase
     def name
       "Santiago"
     end
+
+    attr_writer :language
   end
 
   def form_for(*)
@@ -257,6 +259,17 @@ class FormHelperTest < ActionView::TestCase
     )
   end
 
+  def test_text_field_on_a_model_with_undefined_attr_reader
+    @developer = Developer.new
+    @developer.language = 'ruby'
+    begin
+      text_field("developer", "language")
+    rescue NoMethodError => error
+      message = error.message
+    end
+    assert_equal "Model #{Developer} does not respond to language", message
+  end
+
   def test_check_box
     assert_dom_equal(
       '<input name="post[secret]" type="hidden" value="0" /><input checked="checked" id="post_secret" name="post[secret]" type="checkbox" value="1" />',