ruby on rails - Url security trouble -

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i know that's old question, don't understand why code, worked half year ago doesn't work. want make owners can have access posts. thaught written this:

   def create    @post = current_user.posts.new params[:post]   if @post.save     flash[:notice] = 'post created'     redirect_to @post   else     render :new   end     end

and in edit , others controllers

     def edit        if (current_user.id == @post.user_id)     @post = post.find params[:id]   else     flash[:notice] = 'you not owner!'   end end|

but in views get, when i'm logged in:

 undefined method `user_id' nil:nilclass

where problem ?

def edit   # @post nil unless set in before filter.   if (current_user.id == @post.user_id)     @post = post.find params[:id]   else     flash[:notice] = 'you not owner!'   end end

you should find post first.

def edit   @post = post.find params[:id]   if (current_user.id != @post.user_id)     flash[:notice] = 'you not owner!'   end end

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