Rails - Aug 2006 - instance variables in layouts

There''s probably a simple answer to this simple problem, but I am
trying
to figure out how to reference an instance variable within a layout. In 
the controller, one method corresponds to a view of the same name. Those 
instance variables in the method can be used in the corresponding view. 
However, I want my instance variable to be accessible throughout all my 
views, not just one, without having to set the instance variable in each 
method. Any solutions? Thanks!

-Gilles

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Posted via http://www.ruby-forum.com/.

If you have an attribute accessor on your controller, then you can 
simply invoke the attribute accessor to read the controller instance 
variable:

In the controller:

     attr_accessor :foo, :bar

Or simply

     def get_myvar
         return @myvar
     end

The controller is an instance variable of your view.   You can read the 
controller''s instance variables from inside your view with something
like

  @controller.get_myvar

  or
 
  @controller.foo

I''ve just been playing around with this myself at 
http://robmela.com/stupidtricks/introspection

There was also a useful thread back in June on instance variables in 
controllers.



Gilles wrote:
> There''s probably a simple answer to this simple problem, but I am
trying
> to figure out how to reference an instance variable within a layout. In 
> the controller, one method corresponds to a view of the same name. Those 
> instance variables in the method can be used in the corresponding view. 
> However, I want my instance variable to be accessible throughout all my 
> views, not just one, without having to set the instance variable in each 
> method. Any solutions? Thanks!
>
> -Gilles
>
>   
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Gilles wrote:
> However, I want my instance variable to be accessible throughout all my 
> views, not just one, without having to set the instance variable in each 
> method. Any solutions? Thanks!
> 
Would this work for you?

before_filter :init

def init
  @myvar = .... #whatever you want here
end


init will run before any action is invoked, so I think it should be 
available in your layout regardless of which action was called.

Jeff
softiesonrails.com


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Jeff Cohen wrote:
> Gilles wrote:
>> However, I want my instance variable to be accessible throughout all my
>> views, not just one, without having to set the instance variable in
each
>> method. Any solutions? Thanks!
>> 
> 
> Would this work for you?
> 
> before_filter :init
> 
> def init
>   @myvar = .... #whatever you want here
> end
> 
> 
> init will run before any action is invoked, so I think it should be 
> available in your layout regardless of which action was called.
> 
> Jeff
> softiesonrails.com
And if you want all controller to have an instance variable put that 
snippet in application.rb

And layouts works just like views.

<%= @myvar %> will work identically in both layouts and views.  And 
@myvar can be set in application.rb for all controllers in your whole 
application via the above posters suggestion.

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