Rails - Oct 2006 - Question about variable assignments/scoping after render call

I''ve got a question about how variables are made available to
templates.  We
have a test that looks something like this:

  def test_variable_assigned
    xhr :get, :do_stuff, :id => 1
    assert_not_nil assigns(:thing)
  end

And our app code looks like this:

class SuperClass < ActionController
  def do_stuff
    @parent_model = ParentModel.find(params[:id])
     render :template => ''superclass/do_stuff''
  end
end

class SubClass < SuperClass
   def do_stuff
      super
      @thing = @parent_model.thing
   end
end


When we run our tests with the code above, it fails saying that
assigns(:thing) is nil.  If we redefine do_stuff in SubClass to look like:

   def do_stuff
      @thing = ParentModel.find(params[:id])
      super
    end

then the test will pass.  Unfortunately, this requires an extra database
query to find the parent model twice.  Is there a way of telling the view to
reload its member variables after render has been called, but still render
whatever the chosen template is?


-dmg


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David Goudreau wrote:
> I''ve got a question about how variables are made available to 
> templates.  We have a test that looks something like this:
> 
>   def test_variable_assigned
>     xhr :get, :do_stuff, :id => 1
>     assert_not_nil assigns(:thing)
>   end
> 
> And our app code looks like this:
> 
> class SuperClass < ActionController
>   def do_stuff
>     @parent_model = ParentModel.find(params[:id])
>      render :template => ''superclass/do_stuff''
>   end
> end
> 
> class SubClass < SuperClass
>    def do_stuff
>       super
>       @thing = @parent_model.thing
>    end
> end
> 
> 
> When we run our tests with the code above, it fails saying that 
> assigns(:thing) is nil.  If we redefine do_stuff in SubClass to look like:
> 
>    def do_stuff
>       @thing = ParentModel.find(params[:id])
>       super
>     end
> 
> then the test will pass.  Unfortunately, this requires an extra database 
> query to find the parent model twice.  Is there a way of telling the 
> view to reload its member variables after render has been called, but 
> still render whatever the chosen template is? 
Perhaps write either:

class SuperClass < ActionController
   def do_stuff(parent_model = nil)
     @parent_model = parent_model
     render :template => ''superclass/do_stuff''
   end
end

class SubClass < SuperClass
   def do_stuff
     parent_model = ParentModel.find(params[:id])
     @thing = parent_model.thing
     super(parent_model)
   end
end


or


class SuperClass < ActionController
   def do_stuff(obj = nil)
     @parent_model = ParentModel.find(params[:id])
     instance_variable_set(''@''+obj, @parent_model.send(obj))
if obj
     render :template => ''superclass/do_stuff''
   end
end

class SubClass < SuperClass
   def do_stuff
     super(''thing'')
   end
end

-- 
We develop, watch us RoR, in numbers too big to ignore.


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