CODEWITHSUNDEEP
ruby-on-railsmobile-fu
user3334690
user3334690

Reputation: 899

Rails 3 Specify Fallback Format if MissingTemplate

I have a rails 3.2 application that recently I added mobile-fu gem to, in order to add separate mobile views.
There were a few hiccups but, for the most part, it works wonderfully.

However, I've only made mobile views for a handful of pages. When I attempt to go to a page that does not have a mobile view, from a mobile device, I get:

Missing template after_hour_it_supports/index, application/index with {:locale=>[:en], :formats=>[:mobile], :handlers=>[:erb, :builder, :prawn, :prawn_dsl]}

Which is what I would expect.

However, it is necessary to display some pages which might never have mobile counterparts. Specifically, there is a page to approve something. The thing that they are approving might never have a mobile view made for it, but the approval page already has a mobile view. My current approach, is to use an iframe to display the possibly non-mobile view. Of course, if a mobile view exists, I would prefer to use it over the non-mobile view (still in the iframe).

So what I would like to do is to attempt to render template with the :mobile format, but if the mobile format does not exist, to render with the :html format, which seems like something rails already does based on the :formats array mentioned in the MissingTemplate exception. I can find some documentation on how to set the :formats array when calling render, but I would like to do this automatically, without having to modify every existing response.

How do I modify :formats=>[:mobile] to be :formats=>[:mobile, :html] on an application level?

Upvotes: 1

Views: 181

Answers (1)

user3334690
user3334690

Reputation: 899

I finally found an answer which seems to work for me (the answer by Will Madden).

Specifically, I used his suggestion to override the formats= in my ApplicationController. Which he says is the same way that rails already adds this exact same functionality for the :js format.

The specific method he writes in his answer looks like this:

class ApplicationController
    ...
    def formats=(values)
        values << :html if values == [:mobile]
        super(values)
    end
    ...
end

This is by far the most elegant solution I have found for my circumstances. However, it fails whenever the controller for the page in question contains a respond_to block for the current action.

Upvotes: 0

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