One-to-One relationships with Rails

This is a lot easier than I thought it would be and it actually took me longer than it should have because I was trying to do it manually.

First you need to define the relationship on the parent and children models:

<br />
class Person < ActiveRecord::Base<br />
  has_one  :person_details, :dependent=>true<br />
end</p>
<p>class PersonDetails < ActiveRecord::Base<br />
  belongs_to :person<br />
end</p>
<p>

Note that this automatically will provide with a person_details member for person when it gets retrieved.

Now on the controller, here's the CRUD:

<br />
  def create<br />
    @person = Person.new(params[:person])<br />
    @person_details = PersonDetails.new(params[:person_details])<br />
    @person.person_details = @person_details<br />
    if @person.save<br />
       # Cool, you're done! It saves the person_details as well.<br />
    end<br />
  end</p>
<p> def edit<br />
   @person = Person.find(params[:id])<br />
   @person_details = @person.person_details<br />
 end</p>
<p>def update<br />
  @person = Person.find(params[:id])<br />
  if @person.update_attributes(params[:person]) and<br />
     @person.person_details.update_attributes(params[:person_details])<br />
    # Cool, you're done!<br />
  end<br />
end</p>
<p>def destroy<br />
  Person.find(params[:id]).destroy<br />
end<br />
 

Now your rhtml _form.rhtml must have things like:

<br />
 text_field 'person_details', column.name<br />
 text_field 'person, column.name<br />
 

And you will get two sets of parameters (as you can see in your controller code), params[:person], and params[:person_details]. Your instance variables to set the current values on the view side would be @person and @person_details.

And I was sitting there writing custom code to find/save.. Ugh!

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