Rails has_one belongs_to display field in index?

Question

I have two models : season and category. I want to display the category name in the season index view.

class Season < ActiveRecord::Base
  attr_accessible :nb_down, :nb_up, :name, :category_id
  has_one :category
  accepts_nested_attributes_for :category
end

class Category < ActiveRecord::Base
  attr_accessible :color, :name
  belongs_to :season
end

In my season form, I add a category to season like this :

<%= f.collection_select :category_id, Category.all,:id,:name %>

On my season index view, I want to display all season columns AND category name. I'm displaying id cat doing :

<% @seasons.each do |season| %>
  <tr>
    <td><%= link_to season.id, season_path(season) %></td>
    <td><%= season.name %></td>
    <td><%= season.nb_up %></td>
    <td><%= season.nb_down %></td>
    <td><%= season.category_id %></td>
    (...)

I want to display category name, and not id. I try to do "season.category.name" but no working. Where is my mistake please ?

Thanks :)

[EDIT] : i create a migration to add season_id in categories, and replaced I "has_one" by "belongs_to" in season class and it works : I can display the category name in the season index view.

Answer 1

create a migration

and add 'session_id' column in catogeries table

Run this command in project root directory in terminal

rails generate migration add_column_Session_id_to_categories session_id:integer

this will create migration, Now run this command

 rake db:migrate

thats all you are done