Rails update action does not update boolean field

In my Rails app I have a nested form_for in my show action. This form is the same as the one in the edit action, but it has different fields.

Category -> Task -> completed (boolean, check_box) is what I am trying to update, but it doesn't. Although, if I do Category -> Task -> name (string, text_field) it updates fine.

This does NOT work

<%= form_for check_list do |f| %>
  <%= f.error_messages %>
  <% count = 0 %>
  <ol>
  <%= f.fields_for :tasks do |task| %>
    <li>
      <%= task.label :completed, check_list.tasks[count].name %>
      <%= task.check_box :completed %>
    </li>
    <% count += 1 %>
  <% end %>
  </ol>
  <p><%= f.submit 'Update' %></p>
<% end %>

This works

<%= form_for check_list do |f| %>
  <%= f.error_messages %>
  <% count = 0 %>
  <ol>
  <%= f.fields_for :tasks do |task| %>
    <li>
      <%= task.label :name, check_list.tasks[count].name %>
      <%= task.text_field :name %>
    </li>
    <% count += 1 %>
  <% end %>
  </ol>
  <p><%= f.submit 'Update' %></p>
<% end %>

This is a partial, and check_list is a variable I'm pas开发者_如何学JAVAsing

Edit: Here is the source for my models:

class CheckList < ActiveRecord::Base
  has_many :tasks, :dependent => :destroy
  accepts_nested_attributes_for :tasks, :reject_if => lambda { |a| a[:name].blank? }, :allow_destroy => true

  # Validations
  validates :name, :presence => true

end

class Task < ActiveRecord::Base
  belongs_to :check_list
end

---

I'd suggest adding the name as a hidden field on the form, as Rails probably updates all the fields that are passed into the Action.

<%= form_for check_list do |f| %>
  <%= f.error_messages %>
  <% count = 0 %>
  <ol>
  <%= f.fields_for :tasks do |task| %>
    <li>
      <%= task.label :completed, check_list.tasks[count].name %>
      <%= task.check_box :completed %>
      <%= task.hidden_field :name %>
    </li>
    <% count += 1 %>
  <% end %>
  </ol>
  <p><%= f.submit 'Update' %></p>
<% end %>
  <% end %>
  </ol>
  <p><%= f.submit 'Update' %></p>
<% end %>