have you tried:

assert_difference "Comment.count", blog.comments.count do
  blog(:with_comments).destroy
end

might need to put a minus before the blog.comments.count too.



On Apr 16, 11:29 am, Joshua Muheim <[email protected]>
wrote:
> Fernando Perez wrote:
>
> >> NoMethodError: undefined method `+' for #<Class:0x22cb198>
> > Somewhere in your Blog or Comment code, there is a + hanging around that
> > is trying to add an apple to a car engine.
>
> No idea what you mean... Here's the code:
>
> class Blog < ActiveRecord::Base
>   validates_presence_of :user_id, :title, :content
>
>   belongs_to :user
>
>   has_many :comments,
>     :as => :commentable,
>     :dependent => :destroy
> end
>
> class Comment < ActiveRecord::Base
>   validates_presence_of :commentable,
>                         :subject,
>                         :body
>
>   belongs_to :user
>   belongs_to :article
>   belongs_to :commentable, :polymorphic => true # Kann sowohl einem
> Article als auch einem Blog zugehörig sein
>
>   def html_anchor
>     "comment-#{id}"
>   end
> end
> --
> Posted viahttp://www.ruby-forum.com/.
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