Re: [Rails] Rails 3.2.0.rc1: json and strange respond_with behavior

Ruby on Rails Thursday, December 29, 2011

On Thu, Dec 29, 2011 at 2:08 AM, Eugene Pirogov <iamexile@gmail.com> wrote:
I have a controller:

  class ItemsController < ApplicationController
    respond_to :json

    def index
      items = Item.all

      respond_with(items)
    end
  end

I am curling my_app/items.json and see a response with JSON object — just as expected. At this point I don't have any views associated with controller, specifically I don't have index.html.erb (.html).

Now if only I create an index.haml (for instance), with a simple %h1 Hello, world! line, requesting (again via curl) my_app/items.json returns an html string with <h1>Hello, world!</h1>. Note that I didn't alter the controller code — it just remains untouched.

I'm sure I'm missing something. Can anyone explain of what's going on here?

Observation:

  When you rename the index.haml file to index.html.haml, it will work as expected
  (at least it works here and I could reproduce your problem).

  For json, the default built-in handler for the json format is used.
  For html, the index.html.haml template is used

Speculation:

I presume that Rails first checks if for json, a file with any of the standard
handlers is present (from the error message below, that would be  :erb,
:builder, :coffee, :haml). 

Missing template orders/index, application/index with {:handlers=>[:erb, :builder, :coffee, :haml], :formats=>[:json], :locale=>[:en, :en]}. 

Now if it sees a file ending in .html.haml it is clear that this is a html file
(and not an XML or a JSON file) and not use that file as a template.

But for a file index.haml , I presume Rails accepts this also for rendering json,
even without the .json.haml ending ...

So, I created 2 additional files:

peterv@e6500:~/b/app/views/orders$ vim index.json.haml
peterv@e6500:~/b/app/views/orders$ rm index.json.haml 
peterv@e6500:~/b/app/views/orders$ vim index.haml 
peterv@e6500:~/b/app/views/orders$ rm index.haml 

And the picking order is clear:
* highest priority: index.json.haml
* lesser priority: index.haml
* default: built-in json renderer
* never used: index.html.haml

HTH,

Peter

--
Peter Vandenabeele
http://twitter.com/peter_v

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Posted by Ruby on Rails at 2:27 AM

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