Rails - Dec 2010 - render :json not setting content type (Rails 3.0.3)

Hi,

I''m experiencing a strange problem on an application this is in the
process of being converted from Rails 2.3 to 3.0.3.  I have several
controllers that are rendering either HTML or JSON depending on the
requested format, using respond_to:

respond_to |wants|
  wants.html
  wants.json {render :json => "blah"}
end

One controller works just fine.  The other is sending the wrong
content type header - "text/html" instead of
"application/json".  If I
remove the respond_to block in the second controller, and just
render :json all the time, then the correct type is sent.  There are
no apparent differences between the working and non-working
controllers except the model being retrieved from the database.  I''ve
tried reducing the actions down to rendering just a string as JSON (as
seen above) and still have the same problem.

Does anyone have a suggest as to what could be happening?  How can I
trace the response back through the Rails stack to perhaps see where
the content type is being set (or not set?)

I can provide more detail if needed.

Thanks!

Pete

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It took a little while longer, but I found a supposedly undocumented
gotcha in Rails 3 that was causing my problem.

The controller in question had a private method "content_type"
defined.  Apparently that method is already defined for controllers,
and overriding it was causing the problem with the MIME type.  So,
don''t define a content_type method in your controller.

On Dec 3, 12:26 pm, Pete Deffendol
<p...-fPKBWEOU8FaXDw4h08c5KA@public.gmane.org>
wrote:
> Hi,
>
> I''m experiencing a strange problem on an application this is in
the
> process of being converted from Rails 2.3 to 3.0.3.  I have several
> controllers that are rendering either HTML or JSON depending on the
> requested format, using respond_to:
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