Question

I have following structure:

class User < ActiveRecord::Base
  has_many :Hobbies, :dependent => :destroy
  accepts_nested_attributes_for :hobbies, :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true
end

class Hobby < ActiveRecord::Base 
  belongs_to :User
end

In my Users_controller.rb

  def index
    @data = User.all(:joins => :hobbies)
  end

In index.html.erb

  <% for item in @data %>
    <tr>
      <td><%= item.id %></td> #from table Users
      <td><%= item.hobby_name %></td> #from table Hobbies
     </tr>
  <% end %>

And this gives me an error undefined method `hobby_name’ for # User:0x103cf7480>

I thought that I have that associations right, but this error makes confused… Can you help me someone, please, where could be a problem?

Answer 1

You must specify the relation, your object doesn’t have an attribute called hobby_name, it has an association to multiple hobbies, and each hobby has an attribute called hobby_name

So:

<% item.hobbies.each do |h| %>
<%= h.hobby_name %>
<% end %>