Rails 4 Multiple nested forms

Question

i'm trying to create a multiple nested form I have been following this example http://guides.rubyonrails.org/form_helpers.html#building-complex-forms

here we have

Person > has_many :addresses
Address > belong_to :person

But if I want to add the City table I would have

Person > has_many :addresses
Address > belongs_to :person, belongs_to :city
City > has_many :addresses

The problem comes when I try to add in the form the field City as a text_field NOT as a select. All of the examples I've seen use select instead.

What I want to do is to have a form to create a Person, allow the Person to insert Address and display City as a text field. If the city doesn't exist in the database then create it, if not use the existing one (I guess here I will have to use find_or_create_by?).

Person

class Person < ActiveRecord::Base
  has_many :addresses
  accepts_nested_attributes_for :addresses
end

Address

class Address < ActiveRecord::Base
  belongs_to :person
  belongs_to :city
  accepts_nested_attributes_for :city
end

City

class City < ActiveRecord::Base
  has_many :addresses
end

I dont know how to handle the person params, I have this:

def person_params
    params.require(:person).permit(:name, addresses_attributes: [:id, :kind, :street, cities_attributes: [:id, :city]])
  end

View

<%= form_for @person do |f| %>
  Addresses:
  <ul>
    <%= f.fields_for :addresses do |addresses_form| %>
      <li>
        <%= addresses_form.label :kind %>
        <%= addresses_form.text_field :kind %>

        <%= addresses_form.label :street %>
        <%= addresses_form.text_field :street %>

        <%= addresses_form.fields_for :cities do |cities_form| %>
           <%= cities_form.label :city %>
           <%= cities_form.text_field :city %>
        <% end %>
      </li>
    <% end %>
  </ul>
<% end %>

When i try to add the city i get this error

Unpermitted parameters: cities

And it doesn't add the city to the database nor the Address.

I have been trying to solve this for a while and I haven't able to find a solution. Any idea of what I'm doing wrong?

Show us your Person model.

Pavan
– Pavan

2014-06-05 05:41:00 +00:00
Commented Jun 5, 2014 at 5:41 — Pavan
– Pavan, Commented Jun 5, 2014 at 5:41
I modified the original post to show the 3 models

vander
– vander

2014-06-05 12:48:21 +00:00
Commented Jun 5, 2014 at 12:48 — vander
– vander, Commented Jun 5, 2014 at 12:48

Taryn East · Accepted Answer · 2014-06-05 05:38:06Z

1

That should be city_attributes. An address doesn't have_many :cities, just one. :)

Likewise, you must change the Address so that it belongs_to :city and accepts_nested_attributes_for :city

answered Jun 5, 2014 at 5:38

Taryn East

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3 Comments

vander Over a year ago

Thats how I have it now

Taryn East Over a year ago

Your code above does not have it that way. it has accepts_nested_attributes_for :cities note the pluralisation. it should instead be accepts_nested_attributes_for :city You also have cities_attributes: [:id, :city] and that should be: city_attributes: [:id, :city]

vander Over a year ago

I finally understood what you were traying to say, and it worked! Thanks genius

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