Rails - Sep 2007 - Passing foreign key when creating new child record

What would be considered the "standard" way of setting the foreign key
on a child record when starting from a view of the parent record? E.g.
you''re on a view to a person record and use a link_to load a form that
will enable you to add an address for that person (addresses are
stored in a separate table):

<%= link_to ''New address'', { :controller =>
''addresses'', :action =>
''new'' } %>

The create action in the addresses controller needs to set the
person_id.

Thanks for your input.


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One way is to add person_id to the link to the address construction form:

<%= link_to ''New address'', { :controller =>
''addresses'', :action
=>''new'', :person_id => person } %>

Then pass the person_id to the address construction view and store it in 
a hidden field

then in the create method:
@person = Person.find(params[:person_id])
@person.create_address(params[:address])

Chris Bartlett wrote:
> What would be considered the "standard" way of setting the
foreign key
> on a child record when starting from a view of the parent record? E.g.
> you''re on a view to a person record and use a link_to load a form
that
> will enable you to add an address for that person (addresses are
> stored in a separate table):
>
> <%= link_to ''New address'', { :controller =>
''addresses'', :action =>
> ''new'' } %>
>
> The create action in the addresses controller needs to set the
> person_id.
>
> Thanks for your input.
>
>
> >
>   
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Thanks for the pointer. I''d looked around and couldn''t find a
clear
example. Here''s the relevant code in the various files I used to get
this working.

views/people/show.rhtml

<%= link_to ''New address'', { :controller =>
''addresses'', :action =>
''new'', :person_id => @person } %>


views/addresses/new.rhtml

<% form_for :address, :url => { :action => :create } do |form| %>

	<%= form.hidden_field :person_id, :value => params[:person_id] %>

	[... other form fields, save button, etc.]
<% end %>


models/person.rb

class Person < ActiveRecord::Base
  has_many :addresses
end


models/address.rb

class Address < ActiveRecord::Base
  belongs_to :person
	# So the addresses table needs a ''person_id'' column, which is
the
foreign key
end


controllers/addresses_controller.rb
def new
  @address = Address.new
end
def create
  @address = Address.new(params[:address])
	[...]
end

On Sep 17, 3:31 am, William Pratt
<bi...-YbheRAKfYF4eIZ0/mPfg9Q@public.gmane.org>
wrote:
> One way is to add person_id to the link to the address construction form:
>
> <%= link_to ''New address'', { :controller =>
''addresses'', :action
> =>''new'', :person_id => person } %>
>
> Then pass the person_id to the address construction view and store it in
> a hidden field
>
> then in the create method:
> @person = Person.find(params[:person_id])
> @person.create_address(params[:address])
>
> Chris Bartlett wrote:
> > What would be considered the "standard" way of setting the
foreign key
> > on a child record when starting from a view of the parent record? E.g.
> > you''re on a view to a person record and use a link_to load a
form that
> > will enable you to add an address for that person (addresses are
> > stored in a separate table):
>
> > <%= link_to ''New address'', { :controller =>
''addresses'', :action =>
> > ''new'' } %>
>
> > The create action in the addresses controller needs to set the
> > person_id.
>
> > Thanks for your input.

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