Rails - Nov 2006 - Setting different layouts for a controller based on a param

My webapp can be accessed in two different contexts.  I want to be able to
render the same view with two different layouts based on the context.

Is there a way to dynamically set the layout of the views based on the
context?  ie, if I have a param value which indicates the context type, can
I change the layout dynamically?

Any help would be appreciated.

-- 
anand


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On 11/17/06, Anand Sankaran
<anand.sankaran-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> My webapp can be accessed in two different contexts.  I want to be able to
> render the same view with two different layouts based on the context.
>
> Is there a way to dynamically set the layout of the views based on the
> context?  ie, if I have a param value which indicates the context type, can
> I change the layout dynamically?
>
> Any help would be appreciated.

The classic (builtin) approach is to call

  render :layout => ''other_layout''

in your action.
I would also recommend considering my nested_layouts plugin (
http://nested-layouts.rubyforge.org/) to do it in your view, e.g.

class FooController < ApplicationController
  layout ''polymorphic''

  before_filter :select_layout

  protected

  def select_layout
    if bar
      @layout = ''first''
    else
      @layout = ''second''
    end
  end
end

module FooHelper
  def polymorphic_layout
    @layout
  end
end

layouts/polymorphic.rhtml

<% inside_layout polymorphic_layout do %>
  <%= yield %>
<% end %>

That''s it. The advantage is that you don''t need to specify
proper layout in
every action.

Hope that helps.


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Maxim

That is a neat plugin.  Very useful.  Kudos and many thanks.

I can''t find an answer in the agile rails book, but I think it is easy
to
chain before_filters, so I can use multiple of these filters.  Please
correct me if I am wrong.

Thanks again.


On 11/16/06, Maxim Kulkin
<maxim.kulkin-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> On 11/17/06, Anand Sankaran
<anand.sankaran-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > My webapp can be accessed in two different contexts.  I want to be
able
> > to render the same view with two different layouts based on the
context.
> >
> > Is there a way to dynamically set the layout of the views based on the
> > context?  ie, if I have a param value which indicates the context
type, can
> > I change the layout dynamically?
> >
> > Any help would be appreciated.
>
>
> The classic (builtin) approach is to call
>
>   render :layout => ''other_layout''
>
> in your action.
> I would also recommend considering my nested_layouts plugin (
> http://nested-layouts.rubyforge.org/) to do it in your view, e.g.
>
> class FooController < ApplicationController
>   layout ''polymorphic''
>
>   before_filter :select_layout
>
>   protected
>
>   def select_layout
>     if bar
>       @layout = ''first''
>     else
>       @layout = ''second''
>     end
>   end
> end
>
> module FooHelper
>   def polymorphic_layout
>     @layout
>   end
> end
>
> layouts/polymorphic.rhtml
>
> <% inside_layout polymorphic_layout do %>
>   <%= yield %>
> <% end %>
>
> That''s it. The advantage is that you don''t need to
specify proper layout
> in every action.
>
> Hope that helps.
>
> >
>

-- 
anand

Photo gallery: http://www.anands.net
Photo blog: http://blog.anands.net


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You can have as many filters as you want. They''re run in the order you
call
them. If you return false in any of them, the rest of the filters after that
one will not run.

before_filter can be called in application.rb and since all controllers
inherit from that, you can leverage that to your advantage.

filters can apply to all actions

    before_filter :do_some_stuff

Or some actions

   before_filter :public_page_stuff, :only=>[:list, :show]
   before_filter :admins_only, :except=>[:list, :show]



On 11/17/06, Anand Sankaran
<anand.sankaran-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Maxim
>
> That is a neat plugin.  Very useful.  Kudos and many thanks.
>
> I can''t find an answer in the agile rails book, but I think it is
easy to
> chain before_filters, so I can use multiple of these filters.  Please
> correct me if I am wrong.
>
> Thanks again.
>
>
> On 11/16/06, Maxim Kulkin
<maxim.kulkin-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> > On 11/17/06, Anand Sankaran <
anand.sankaran-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> > > My webapp can be accessed in two different contexts.  I want to
be
> > > able to render the same view with two different layouts based on
the
> > > context.
> > >
> > > Is there a way to dynamically set the layout of the views based
on the
> > > context?  ie, if I have a param value which indicates the context
type, can
> > > I change the layout dynamically?
> > >
> > > Any help would be appreciated.
> >
> >
> > The classic (builtin) approach is to call
> >
> >   render :layout => ''other_layout''
> >
> > in your action.
> > I would also recommend considering my nested_layouts plugin (
> > http://nested-layouts.rubyforge.org/) to do it in your view, e.g.
> >
> > class FooController < ApplicationController
> >   layout ''polymorphic''
> >
> >   before_filter :select_layout
> >
> >   protected
> >
> >   def select_layout
> >     if bar
> >       @layout = ''first''
> >     else
> >       @layout = ''second''
> >     end
> >   end
> > end
> >
> > module FooHelper
> >   def polymorphic_layout
> >     @layout
> >   end
> > end
> >
> > layouts/polymorphic.rhtml
> >
> > <% inside_layout polymorphic_layout do %>
> >   <%= yield %>
> > <% end %>
> >
> > That''s it. The advantage is that you don''t need to
specify proper layout
> > in every action.
> >
> > Hope that helps.
> >
> >
> >
>
>
> --
> anand
>
> Photo gallery: http://www.anands.net
> Photo blog: http://blog.anands.net
>
> >
>

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On 17 November 2006 17:56, Anand Sankaran wrote:
> I can''t find an answer in the agile rails book, but I think it is
easy to
> chain before_filters, so I can use multiple of these filters.  Please
> correct me if I am wrong.
Yes, before and after filters are chained and, I believe, around filters are 
nested.

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Thanks Brian and Maxim.

Yes, before and after filters are chained and, I believe, around filters
are
> nested.
>
-- 
anand


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