[Rails] Nested Forms with belongs_to association

[Sereno Mendes]

Hi all,

I have a relationship in this form: A person belongs to an address and a
address can have many persons like below:

class Person < ActiveRecord::Base
belongs_to :address
end

class Address < ActiveRecord::Base
has_many: persons
end

The ideia behind this is, if two or more persons share the same address,
isn't necessary create two indetical rows in the database. But, like i'm
new in the rails development, i want to create a form for person
creation and edition that wraps the creation of related address, as a
nested form. I already made a search for a solution for this problem,
but the solutions that i found in others sites are for the inverse
associations, any idea?

Thanks.
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[Mlle]

You should probably have the Person have an Address, that way you can
nest the Address creation form within your Person form.
Logically, you shouldn't nest the form of an Address within a Person
form since it's the Address that owns the Person according to your
current model...

On Apr 29, 2:18 pm, Sereno Mendes <li...@ruby-forum.com> wrote:
> Hi all,
>
> I have a relationship in this form: A person belongs to an address and a
> address can have many persons like below:
>
> class Person < ActiveRecord::Base
>   belongs_to :address
> end
>
> class Address < ActiveRecord::Base
>   has_many: persons
> end
>
> The ideia behind this is, if two or more persons share the same address,
> isn't necessary create two indetical rows in the database. But, like i'm
> new in the rails development, i want to create a form for person
> creation and edition that wraps the creation of related address, as a
> nested form. I already made a search for a solution for this problem,
> but the solutions that i found in others sites are for the inverse
> associations, any idea?
>
> Thanks.
> --

> Posted viahttp://www.ruby-forum.com/.

[Sereno Mendes]

Mlle wrote:
> You should probably have the Person have an Address, that way you can
> nest the Address creation form within your Person form.
> Logically, you shouldn't nest the form of an Address within a Person
> form since it's the Address that owns the Person according to your
> current model...

No, no. I solved the issue and the creation makes sense. View this post
and you will understand why.

http://stackoverflow.com/questions/1313149/getting-fields-for-and-accepts-nested-attributes-for-to-work-with-a-belongs-to-re
--
Posted via http://www.ruby-forum.com/.

[Mike]

I'm relatively new to Rails myself, though I've been somewhat
successful with nested model associations in both directions.

Models:

class Person < ActiveRecord::Base
belongs_to :address

accepts_nested_attributes_for :address

end

class Address < ActiveRecord::Base
has_many: persons

accepts_nested_attributes_for :persons
end

Controller:
class PersonsController < ApplicationController
def new
@person = Person.new
@person.address = Address.new
end
def create
@person = Person.new params[:person]
if @person.save
redirect_to :show
else
render :new
end
end
end
class AddressesController < ApplicationController
def new
@address = Address.new
1.times { @address.persons.build } # increase 1 to default number of
people at address
end
def create
@address = Address.new params[:address]
if @address.save
redirect_to :show
else
render :new
end
end

Views:
# persons/new.html.erb
<% form_for @person do |person_fields| %>
<% person_fields.fields_for :address do |address_fields| %>
<%= address_fields.label ... %>
<% end %>
<% end %>
# addresses/new.html.erb
<% form_for @address do |address_fields| %>
<% address_fields.fields_for :persons do |person_fields| %>
<%= person_fields.label ... %>
<% end %>
<% end %>

If you get weird errors such as HashWithIndifferentAccess, try
refreshing your browser, so it pulls in a fresh form.

Hope that helps,
Mike

On Apr 29, 5:18 am, Sereno Mendes <li...@ruby-forum.com> wrote:
> Hi all,
>
> I have a relationship in this form: A person belongs to an address and a
> address can have many persons like below:
>
> class Person < ActiveRecord::Base
>   belongs_to :address
> end
>
> class Address < ActiveRecord::Base
>   has_many: persons
> end
>
> The ideia behind this is, if two or more persons share the same address,
> isn't necessary create two indetical rows in the database. But, like i'm
> new in the rails development, i want to create a form for person

> creation and edition that wraps the creation of related address, as anestedform. I already made a search for a solution for this problem,

> but the solutions that i found in others sites are for the inverse
> associations, any idea?
>
> Thanks.
> --

> Posted viahttp://www.ruby-forum.com/.