Models and relationships

Rails
1

If I have three models; Post, Comment, and User, and they are all set up
according to Rails naming conventions, and I have established their
relationships in the model code as follows:

class Post < ActiveRecord::Base
has_many :comments
end

class User < ActiveRecord::Base
has_many :comments
end

class Post < ActiveRecord::Base
belongs_to :post
belongs_to :user
end

Then should I be able to do something like this?

01 <% for post in @posts %>
02 <% for comment in post.comments %>
03 <%= comment.user.username %>
04 <% end %>
05 <% end %>

It’s line 03 that’s causing me a problem, as it generates an “undefined
method ‘user’ for #Comment:0xHEX” error. Replacing that line with
User.find(comment.user_id).username works, but Im not sure if I should
be doing it that way or not.

2

David E. wrote:

class Post < ActiveRecord::Base
belongs_to :post
belongs_to :user
end

Ignore my poor copy and pasting, that should be class Comment.

3

David E. wrote:

class Post < ActiveRecord::Base
belongs_to :post
belongs_to :user
end

Then should I be able to do something like this?

01 <% for post in @posts %>
02 <% for comment in post.comments %>
03 <%= comment.user.username %>
04 <% end %>
05 <% end %>

It’s line 03 that’s causing me a problem, as it generates an “undefined
method ‘user’ for #Comment:0xHEX” error. Replacing that line with
User.find(comment.user_id).username works, but Im not sure if I should
be doing it that way or not.

According to your model structure, each post has only one comment… so
it’s post.comment not post.comments…

hope this helps…

ilan

4

Ilan B. wrote:

David E. wrote:

According to your model structure, each post has only one comment… so
it’s post.comment not post.comments…

hope this helps…

ilan

Whoops… missed the edit… sorry…