Polymorphic problema


#1

It appears that I have the models and migrations set up correctly.

In case anyone is wondering why i set it up like this I had it working
with just a contact model and this will save a bunch of coding changes
to my already working CRUD ajax inline contact form. I am adding a
contrator model so I would like to have a polymorphic setup so I can
differentiate the two types of people in the form.

I have a Person that is polymorphic, it will have a contact and
contractor type.

class Person < ActiveRecord::Base
belongs_to :contactable, :polymorphic => true
end

class Contact < ActiveRecord::Base
has_many :people, :as => :contactable
end

When I do:

person = Person.create(params[:person])
@contact = Contact.create(params[:contact])
person.contactable = @contact

It goes without an error but puts NIL in the contactable_type and
contactable_id columns.

Anyone have an idea why? I spent a couple hours with this earlier.


#2

In case anyone is wondering here is the migration:

class CreatePeople < ActiveRecord::Migration
def self.up
create_table :people do |t|
t.integer :company_id
t.references :contactable, :polymorphic => true

  t.timestamps
end

end

def self.down
drop_table :people
end
end


#3

On Apr 19, 1:50 am, Me removed_email_address@domain.invalid wrote:

person = Person.create(params[:person])
@contact = Contact.create(params[:contact])
person.contactable = @contact

It goes without an error but puts NIL in the contactable_type and
contactable_id columns.

Anyone have an idea why? I spent a couple hours with this earlier.

Are you saving the person record after having assigned the
contactable ?

Fred


#4

The Create method saves on creation does it not?

On Sun, Apr 19, 2009 at 12:27 PM, Frederick C. <


#5

Here is my stand alone script i just tried, still putting NIL in the
contactable columns: I even tried person.contactable.save to no avail.

RAILS_ENV = ‘development’

require File.dirname(FILE) + ‘/…/config/boot’
require File.dirname(FILE) + ‘/…/config/environment’

@contact = Contact.create(:name => ‘moo’)
@contact.save
person = Person.create(:company_id => ‘1’)
person.save
person.contactable = @contact

On Sun, Apr 19, 2009 at 12:27 PM, Frederick C. <


#6

I did the example in rails recipe. I can retrieve the addressable_id
and type when I create itfrom the console, but when I go log out and
go back and try to retrieve them they give back NIL just like the DB
shows. Is the ID and TYPE supposed to show up in the DB? I am still
getting NIL for the polymorphic columns. Stumped…


#7

Ok, I was looking at the DB for the contactable.type and id. Why does
it
not show up there but when you query it is is there?

On Sun, Apr 19, 2009 at 12:27 PM, Frederick C. <


#8

Because assignment of the new parent record to a child is not
immideately persisted. You need to call save to persist it in the
database.

So this changes only the object in memory:
person.contactable = @contact

This updates the database:
person.contactable = @contact
person.save

Dmitry


#9

Ok, I did a new method instead of create and then the last thing I did
was a save and it works. Anybody know why?


#10

I did that even with the “create” methid, no luck. I had to use the
“new”
method and save it for it to write to the db.

On Tue, Apr 21, 2009 at 8:21 AM, removed_email_address@domain.invalid <