Update child objects in a nested form in Rails

Question

My object is a Section. Each Section can have other Sections. Section responds to #index, index returns its order index. 0 if a section does not have sibling sections.

Let's assume my data structure is:

   a
 /   \
b     c

Where:

a.index = 0

b.index = 0

c.index = 1

If I navigate to /sections/a/manage-child-ordering, I want to be able to edit the order of the subsections of a. This is the code in my view:

<% if @section.children %>
    <%= form_for @section do |child| %>
      <%= f.fields_for :children, @section.children do |c| %>
        <%= c.text_field :index %>
      <% end %>
    <% end %>
<% end %>

<%= f.submit 'Save', class: 'btn-submit' %>

The error I get:

undefined method `errors' for #<Tag::ActiveRecord_Associations_CollectionProxy:0x007f23e60bdbd0>

What am I doing wrong?

Jack · Accepted Answer · 2015-07-09 08:55:16Z

1

Adding this in the model did the trick:

belongs_to :parent, class_name: 'Section'
has_many :children, class_name: 'Section', foreign_key: :parent_id

accepts_nested_attributes_for :children

edited Jul 9, 2015 at 8:55

answered Jul 3, 2015 at 15:04

Jack

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1 Comment

Kurt Mueller Over a year ago

Do you mean the model?

smathy · Accepted Answer · 2015-07-03 14:36:23Z

0

form_for should not take a collection, it should take just the single model which is responsible for implementing the action of the form. For you this is probably @section ie.

= form_for @section do |f|

answered Jul 3, 2015 at 14:36

smathy

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2 Comments

Jack Over a year ago

updated and updated the new error message I am getting.

smathy Over a year ago

Then you'll have to show more code, like where you're setting that @section var (and what to).

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