Question

I’ve got a simple one to many relationship between tasks and priorities.

class Task < ActiveRecord::Base
    attr_accessible :subject, :body, :priority_id, :company_id, :status_id, :user_ids
    has_and_belongs_to_many :users
    belongs_to :priority
    belongs_to :company
    belongs_to :status
end


class Priority < ActiveRecord::Base
    attr_accessible :name
    has_many :tasks
end

From my tasks/show.html.erb view

<%= @task.priority.name %>

This works.

However in my tasks/index.html.erb

<% @tasks.each do |task| %>
  <tr>
    <td><%= task.subject %></td>
    <td><%= task.body %></td>
    <td><%= task.priority.name %></td>
    <td><%= link_to 'Show', task %></td>
    <td><%= link_to 'Edit', edit_task_path(task) %></td>
    <td><%= link_to 'Destroy', task, confirm: 'Are you sure?', method: :delete %></td>
  </tr>
<% end %>

The call to task.priority.name does not work.

It throws a NoMethodError.

I’m guessing this is a really stupid newbie mistake but I can’t for the life of me figure it out. It would have assumed that the Active Record magic would have filtered down into a look like this.

Answer 1

I guess your NoMethodError comes on nil:NilClass. Try:

  <%= task.priority.name if task.priority %>