Ruby on Rails

hi, guys,
I would like to define a common method in the application controller
because the other resources will use this method.

Scenario: I have 2 resources: Posts (for blogs) and Coupons.

Common method: is_owner_or_admin( object )

I have defined this method within the application controller as I
figured it's akin the base class that the controllers for the
resources will inherit from.
I'm just testing the syntax call so, please don't look at this from a
process design point of view :)

application_controller.rb
=================

class ApplicationController < ActionController::Base
protect_from_forgery

def is_owner_or_admin(obj)
@part = Part.find(params[:id])
@current_user = get_current_user

if ( @current_user == nil )
flash[:notice] = 'Access denied'
redirect_to root_url
return false
elsif ( @current_user.is_admin or (@current_user.login ==
@part.created_by) )
return true
else
flash[:notice] = 'Access denied'
redirect_to root_url
return false
end
end
end

I'm trying to call this method in each of the before_filter in the
resources (ie. Posts, Coupons).
So, in posts_controller.rb , I do:

class PostsController < ApplicationController
before_filter :authenticate_user!,
:except => [:index, :show, :send_message, :get_subcategories]

...

def show
@post = Post.find(params[:id])
:is_owner_or_admin(@post)

respond_to do |format|
format.html # show.html.erb
format.xml { render :xml => @post }
end
end

.....

end

Anyway, when I run the rails server or run "ruby -w
posts_controller.rb", I get the following error:

/home/ct9a/projects/port_over_to_rails3/app/controllers/
posts_controller.rb:20: syntax error, unexpected '(', expecting
keyword_end
:is_owner_or_admin(@post)
^

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