Hi,
Reviving an old topic about the need of a before_render filter (topic found
through Google, my apologies if there is a more recent thread)
Here is a use case:
- A controller's parent class is preparing a set of JavaScript variables to
be passed to the view
- The view template is inserting those JavaScript variables in the HTML code
- The JavaScript variables need elements loaded/set by the controller
As the controller action takes place after the action filters and before
the rendering, the only actual solution is to patch `render`.
Code example:
class ApplicationController
def render(*args)
unless @we_already_prepared_js_vars
@we_already_prepared_js_vars = true # This is to avoid loading those
variable for each call of render
@_js_vars = prepare_js_vars
end
super
end
end
class UserController < ApplicationController
before_filter :load_user
def prepare_js_vars
{record_created_at: @user.created_at}
end
def load_user
@user = User.find params[:id]
end
end
Would be more elegant to use a before_render filter in the
ApplicationController
Regards
On Friday, September 7, 2012 at 8:58:17 PM UTC+2, Carlos Antonio da Silva
wrote:
>
> Please show any real use case where this will be useful, to make things
> more clear. Otherwise it's just hard to figure it out examples where it's
> useful or not. Thanks.
>
> On Wed, Sep 5, 2012 at 3:53 PM, Alexander Kurakin <kura...@mail.ru
> <javascript:>> wrote:
>
>> Will not be useful functionality similar
>> https://github.com/shell/rails3_before_render ? Something like
>> ActionController filters but not before action. Filters before render. See
>> also http://www.perfectline.ee/blog/ruby-on-rails-before-render-filter,
>> http://penkin.co.uk/rails3_before_render-plugin/. And don't you know gem
>> for this? Thanks.
>>
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>
>
>
> --
> At.
> Carlos Antonio
>
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