Forum: Ruby on Rails Disabling layout in action disables rendering of action data

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Sj T. (Guest)
on 2009-04-14 02:59

I have a base layout (views/layouts/base.erb) included from
ApplicationController -- layout 'base'

This seems to work fine and all controllers automatically include that
layout. However I am now trying to disable layout for certain actions
when I do a GET on them. For example I try to GET some json data using
http://localhost:3001/admin/someaction/1.json  (from within my view page
to load some json data dynamically)

The "someaction" action in admin controller is something like below

def someaction
    respond_to do |format|
      format.html {
      format.json {
        render(:layout => false)  <--- Doing this disables sending of
@somevar through the view
        @somevar = compute_contents_of_this_var_in_json
     }"@somevar = " + @somevar)

In views/admin/someaction.json.erb I have a single line as below
<%= @somevar %>

This basically sends out the json data in @somevar to the browser.

The problem I am running into is that when I set rendering of layout to
false in someaction, no data gets sent out (@somevar has the needed data
- I see that in the logs) and when I don't turn off rendering of layout,
I get all the HTML from my layout (as I would expect) that I don't want.

I tried removing the layout statement from ApplicationController and
then without having to turn off layout rendering in someaction, it sends
out the right json data without the HTML.

I don't understand why turning off rendering of layout in someaction
disables sending of the json data in the @somevar variable. Sounds like
I am missing something basic but not sure what it is. I am on 2.2.2

Thanks for your help.
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