Rails - Feb 2006 - .empty? Method

I am using:

    if @post.empty?
       render_text "Post does not exist."
    end

But it gives me this error:

NoMethodError in Posts#view

undefined method `empty?'' for #<Posts:0x39598d0>

However, if the method list empty? apears and stuff so I am confused.

-- 
Posted via http://www.ruby-forum.com/.

It looks like you are calling it on a Post object, where the .empty is
meant for collections/strings and such. Should the above line read,
if @posts.empty?
..

Notice the s. I''m guessing you are loading posts like:
@posts = Post.find(:all)?

if so then @posts.empty? should work just fine.

-Nick

On 2/11/06, Michael Boutros <me@michaelboutros.com>
wrote:
> I am using:
>
>     if @post.empty?
>        render_text "Post does not exist."
>     end
>
> But it gives me this error:
>
> NoMethodError in Posts#view
>
> undefined method `empty?'' for #<Posts:0x39598d0>
>
> However, if the method list empty? apears and stuff so I am confused.
>
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

Nick Stuart wrote:
> It looks like you are calling it on a Post object, where the .empty is
> meant for collections/strings and such. Should the above line read,
> if @posts.empty?
> ..
> 
> Notice the s. I''m guessing you are loading posts like:
> @posts = Post.find(:all)?
> 
> if so then @posts.empty? should work just fine.
> 
> -Nick
No, I am doing a view page to view an entry seperately. I am using the 
.empty? method to check if the row exists, and if it does not I will 
output an error. This is the entire page code:

class PostsController < ApplicationController
  def index
    @posts = Posts.find_all
  end

  def view
    @post = Posts.find(@params["id"])

    if @post.empty?
       render_text "Post does not exist."
    end

  end

end

-- 
Posted via http://www.ruby-forum.com/.

Michael Boutros wrote:
>   def view
>     @post = Posts.find(@params["id"])
>     if @post.empty?
>        render_text "Post does not exist."
>     end
>   end
You can''t use empty? on a class object. That method isn''t
supported, which i
believe is exactly what the error message tried to tell you. You want to check 
to see if the result of the find command has resulted in a defined @post object.

Change the condition to: if @post.nil?

or: unless @post

-Brian