View helpers not defined in extended Rabl templates

[davidsulc]

Hi,

I've run into an issue that seems to be a "continuation" of https://github.com/gazay/gon/issues/26, which in turn seems related to https://github.com/nesquena/rabl/issues/19 and https://github.com/nesquena/rabl/issues/147

Context: a "topic" has many "exercises". I'm using gon to bootstrap the topic data (including all related exercise instances).

Exercise Rabl template ("exercises/show"):

object @exercise

# probably not relevant
# attributes :id, :topic_id, :instructions, :avg_score

node(:last_attempt) { |exercise| time_ago_in_words(exercise.last_attempt) + " ago" }

# probably not relevant
# child :exercise_items => :questions do
#   extends "exercise_items/_base"
# end

Topic Rable template ("topics/show"):

object @topic

# probably not relevant
# extends "topics/base"

child :exercises do
  extends "exercises/show"
end

Relevant controller action:

def show
  gon.topic = Rabl.render(@topic,  "topics/show", format: :json)
  redirect_to_web_app
end

Accessing the controller action raises the following error:

undefined method `time_ago_in_words' for #<Rabl::Engine:0x00000004ff08d0>

If I access the API endpoint, Rabl renders the JSON data correctly. In addition, if I comment the gon.topic line above, the error is no longer raised.

A work around to get this working is to manually include the helper in the controller with

require 'action_view'
include ActionView::Helpers::DateHelper

It seems the issue is related to using a sub-view ("exercises/show") in the "topics/show" Rabl template that is given to gon within the controller.

To be noted: using view helpers within the rendered view provided to gon works as expected. I.e. the following code (in a controller) does not raise an exception:

gon.exercise = Rabl.render(@exercise,  "exercises/show", format: :json)

Once again, the issue seems to be present only if a view helper is used in a sub-view (i.e. "exercises/show") that Rabl extends from the "main" view (i.e. "topics/show") provided to gon.

[petermumford]

I'm also getting this error and its also related to using sub-views - api/v1/topics/index - however when I try including the helper in the controller I'm still getting the same error.