turning load and authorize resource methods into class methods which set up the before filter so they can accept additional arguments

CHANGELOG.rdoc

@@ -1,3 +1,5 @@
+* BACKWARDS INCOMPATIBLE: turning load and authorize resource methods into class methods which set up the before filter so they can accept additional arguments.
+
 0.2.1 (Nov 26, 2009)
 
 * many internal refactorings - see issues #11 and #12

lib/cancan/controller_additions.rb

@@ -3,7 +3,56 @@ module CanCan
   # This module is automatically included into all controllers.
   # It also makes the "can?" and "cannot?" methods available to all views.
   module ControllerAdditions
+    module ClassMethods
+      # Sets up a before filter which loads and authorizes the current resource. This accepts the
+      # same arguments as load_resource and authorize_resource. See those methods for details.
+      # 
+      #   class BooksController < ApplicationController
+      #     load_and_authorize_resource
+      #   end
+      # 
+      def load_and_authorize_resource(*args)
+        before_filter { |c| ResourceAuthorization.new(c, c.params, *args).load_and_authorize_resource }
+      end
+      
+      # Sets up a before filter which loads the appropriate model resource into an instance variable.
+      # For example, given an ArticlesController it will load the current article into the @article
+      # instance variable. It does this by either calling Article.find(params[:id]) or
+      # Article.new(params[:article]) depending upon the action. It does nothing for the "index"
+      # action.
+      # 
+      # You would call this method directly on the controller class.
+      # 
+      #   class BooksController < ApplicationController
+      #     load_resource
+      #   end
+      # 
+      # See load_and_authorize_resource to automatically authorize the resource too.
+      def load_resource(*args) # TODO add documentation for options which can be passed.
+        before_filter { |c| ResourceAuthorization.new(c, c.params, *args).load_resource }
+      end
+      
+      # Sets up a before filter which authorizes the current resource using the instance variable.
+      # For example, if you have an ArticlesController it will check the @article instance variable
+      # and ensure the user can perform the current action on it. Under the hood it is doing
+      # something like the following.
+      # 
+      #   unauthorized! if cannot?(params[:action].to_sym, @article || Article)
+      # 
+      # You would call this method directly on the controller class.
+      # 
+      #   class BooksController < ApplicationController
+      #     authorize_resource
+      #   end
+      # 
+      # See load_and_authorize_resource to automatically load the resource too.
+      def authorize_resource(*args)
+        before_filter { |c| ResourceAuthorization.new(c, c.params, *args).authorize_resource }
+      end
+    end
+    
     def self.included(base)
+      base.extend ClassMethods
       base.helper_method :can?, :cannot?
     end
     
@@ -70,48 +119,6 @@ module CanCan
     def cannot?(*args)
       (@current_ability ||= current_ability).cannot?(*args)
     end
-    
-    # This method loads the appropriate model resource into an instance variable. For example,
-    # given an ArticlesController it will load the current article into the @article instance
-    # variable. It does this by either calling Article.find(params[:id]) or
-    # Article.new(params[:article]) depending upon the action. It does nothing for the "index"
-    # action.
-    # 
-    # You would often use this as a before filter in the controller. See
-    # load_and_authorize_resource to handle authorization too.
-    # 
-    #   before_filter :load_resource
-    # 
-    def load_resource
-      ResourceAuthorization.new(self, params).load_resource
-    end
-    
-    # Authorizes the resource in the current instance variable. For example,
-    # if you have an ArticlesController it will check the @article instance variable
-    # and ensure the user can perform the current action on it.
-    # Under the hood it is doing something like the following.
-    # 
-    #   unauthorized! if cannot?(params[:action].to_sym, @article || Article)
-    # 
-    # You would often use this as a before filter in the controller.
-    # 
-    #   before_filter :authorize_resource
-    # 
-    # See load_and_authorize_resource to automatically load the resource too.
-    def authorize_resource
-      ResourceAuthorization.new(self, params).authorize_resource
-    end
-    
-    # Calls load_resource to load the current resource model into an instance variable. 
-    # Then calls authorize_resource to ensure the current user is authorized to access the page. 
-    # You would often use this as a before filter in the controller.
-    # 
-    #   before_filter :load_and_authorize_resource
-    # 
-    def load_and_authorize_resource
-      load_resource
-      authorize_resource
-    end
   end
 end
 

spec/cancan/controller_additions_spec.rb

@@ -27,19 +27,21 @@ describe CanCan::ControllerAdditions do
     @controller.cannot?(:foo, :bar).should be_true
   end
   
-  it "should load resource" do
-    mock.instance_of(CanCan::ResourceAuthorization).load_resource
-    @controller.load_resource
+  it "load_and_authorize_resource should setup a before filter which passes call to ResourceAuthorization" do
+    stub(CanCan::ResourceAuthorization).new(@controller, @controller.params, :foo => :bar).mock!.load_and_authorize_resource
+    mock(@controller_class).before_filter { |block| block.call(@controller) }
+    @controller_class.load_and_authorize_resource :foo => :bar
   end
   
-  it "should authorize resource" do
-    mock.instance_of(CanCan::ResourceAuthorization).authorize_resource
-    @controller.authorize_resource
+  it "authorize_resource should setup a before filter which passes call to ResourceAuthorization" do
+    stub(CanCan::ResourceAuthorization).new(@controller, @controller.params, :foo => :bar).mock!.authorize_resource
+    mock(@controller_class).before_filter { |block| block.call(@controller) }
+    @controller_class.authorize_resource :foo => :bar
   end
   
-  it "should load and authorize resource in one call through controller" do
-    mock(@controller).load_resource
-    mock(@controller).authorize_resource
-    @controller.load_and_authorize_resource
+  it "load_resource should setup a before filter which passes call to ResourceAuthorization" do
+    stub(CanCan::ResourceAuthorization).new(@controller, @controller.params, :foo => :bar).mock!.load_resource
+    mock(@controller_class).before_filter { |block| block.call(@controller) }
+    @controller_class.load_resource :foo => :bar
   end
 end

spec/cancan/resource_authorization_spec.rb

@@ -56,4 +56,11 @@ describe CanCan::ResourceAuthorization do
       authorization.authorize_resource
     }.should raise_error(CanCan::AccessDenied)
   end
+  
+  it "should call load_resource and authorize_resource for load_and_authorize_resource" do
+    authorization = CanCan::ResourceAuthorization.new(@controller, :controller => "abilities", :action => "show")
+    mock(authorization).load_resource
+    mock(authorization).authorize_resource
+    authorization.load_and_authorize_resource
+  end
 end