Rails - Aug 2013 - I am getting a ' undefined method error ' when saving a comment

hi!! I am a newbie in ROR.

I have two models

Post
has_many :Comment


Comment
belongs_to :Post


the error displays when I try to save a comment related to certain post.
I get the following error
-----------------------------------------------------------------
undefined method `comment'' for nil:NilClass
-----------------------------------------------------------------
my comment controllers

  def new
 @comment = Comment.new
render :layout => false
  end

  def create
    @post = Post.find_by_id(params[:id])
    @post_comment = @post.comment.create(params[:comment])
    if @post_comment.save
      redirect_to post_index_path
      flash[:success] = "comment created!!"
    end

Could someone please explain why am I getting this error..

Thanks in advance :)

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You shold use

*has_many :comments*

instead of

*has_many :comment*

Then you can call

@post.comments

Look this example:
http://guides.rubyonrails.org/association_basics.html#the-has-many-through-association

Take a look at accepts_nested_attributes to create your posts:
http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html



2013/8/22 ank k. <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
> hi!! I am a newbie in ROR.
>
> I have two models
>
> Post
> has_many :Comment
>
>
> Comment
> belongs_to :Post
>
>
> the error displays when I try to save a comment related to certain post.
> I get the following error
> -----------------------------------------------------------------
> undefined method `comment'' for nil:NilClass
> -----------------------------------------------------------------
> my comment controllers
>
>   def new
>  @comment = Comment.new
> render :layout => false
>   end
>
>   def create
>     @post = Post.find_by_id(params[:id])
>     @post_comment = @post.comment.create(params[:comment])
>     if @post_comment.save
>       redirect_to post_index_path
>       flash[:success] = "comment created!!"
>     end
>
> Could someone please explain why am I getting this error..
>
> Thanks in advance :)
>
> --
> Posted via http://www.ruby-forum.com/.
>
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On 22 August 2013 20:56, ank k.
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:
> hi!! I am a newbie in ROR.
>
> I have two models
>
> Post
> has_many :Comment
that should be
has_many :comments
note that it is plural and lower case
>
>
> Comment
> belongs_to :Post
belongs_to :post
>
>
> the error displays when I try to save a comment related to certain post.
> I get the following error
> -----------------------------------------------------------------
> undefined method `comment'' for nil:NilClass
> -----------------------------------------------------------------
> my comment controllers
>
>   def new
>  @comment = Comment.new
> render :layout => false
>   end
>
>   def create
>     @post = Post.find_by_id(params[:id])
>     @post_comment = @post.comment.create(params[:comment])
You have not told us which line the error points to but I guess it is
the one above.  If so then it is saying that @post is nil, so your
find_by_id did not find anything.  You don''t need to use find_by_id,
you can just use
@post = Post.find( params[:id] )
Perhaps there is not a Post object with the correct id.  If you look
in log/development.log you will see the params you are passing which
may give you a clue.

I suggest, however, that as a beginner you work right through a good
tutorial such as railstutorial.org (which is free to use online).
That will show you the basics of rails.

Also see the Rails Guides.

Colin

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