Rails - Dec 2011 - Rails 3.2.0.rc1: json and strange respond_with behavior

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?

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On Thu, Dec 29, 2011 at 2:08 AM, Eugene Pirogov
<iamexile-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 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
http://rails.vandenabeele.com

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Awesome! Thank you, Peter. Now it''s clear to me of what''s
happening.

Also I think the documentation worth mentioning this behavior.

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