Has_many_polymorphs and acts_as_list?

Rails
1

First, BRAVO for this wonderful plugin: has_many_polymorphs ! Now my
problem:

4 models : Collection, Page, Fragment, Belonging (which is the join
table):

1 class Collection <
ActiveRecord::Base
2 has_many_polymorphs :elements,
3 :through => :belongings,
4 :from => [:pages, :fragments, :collections],
5 :as => :collector,
6 :parent_order => ‘belongings.position’
7 end

1 class Page <
ActiveRecord::Base
2 has_many :fragments
3 end

1 class Fragment <
ActiveRecord::Base
2 belongs_to :page
3 end

1 class Belonging <
ActiveRecord::Base
2 belongs_to :collector,
3 :class_name => “Collection”,
4 :foreign_key => “collector_id”
5 belongs_to :element, :polymorphic => true
6 acts_as_list :scope => ‘element_id=#{element_id} and
element_type=#{quote_value element_type}’
7 end

The belongings database table structure:

collector_id (integer) ; element_id (integer) ; element_type
(string) ; position (integer)

The self referential polymorphic aspect works like a charm!
But the acts_as_list doesn’t!
Here a demonstration inside the console:

c = Collection.create(:name => “C1”)
c.elements << Page.create(:name => “P1”)
c.elements << Page.create(:name => “P2”)
y c
— &id006 !ruby/object:Collection
attributes:
name: C1
updated_at: &id001 2007-11-14 13:17:45.877143 +01:00
id: 1
created_at: *id001
belongings:

  • !ruby/object:Belonging
    attributes:
    updated_at: 2007-11-14 13:18:39
    element_id: “1”
    id: “1”
    collector_id: “1”
    element_type: Page
    position: “1”
    created_at: 2007-11-14 13:18:39

  • !ruby/object:Belonging
    attributes:
    updated_at: 2007-11-14 13:19:06
    element_id: “2”
    id: “2”
    collector_id: “1”
    element_type: Page
    position: “1”
    created_at: 2007-11-14 13:19:06
    elements:

  • &id003 !ruby/object:Page
    attributes:
    name: P1
    updated_at: &id002 2007-11-14 13:18:39.397292 +01:00
    id: 1
    created_at: *id002
    errors: !ruby/object:ActiveRecord::Errors
    base: *id003
    errors: {}

    new_record: false
    new_record_before_save: true

  • &id005 !ruby/object:Page
    attributes:
    name: P2
    updated_at: &id004 2007-11-14 13:19:06.052972 +01:00
    id: 2
    created_at: *id004
    errors: !ruby/object:ActiveRecord::Errors
    base: *id005
    errors: {}

    new_record: false
    new_record_before_save: true
    errors: !ruby/object:ActiveRecord::Errors
    base: *id006
    errors: {}

new_record: false
new_record_before_save: true
=> nil

c.elements.first.move_to_bottom
NoMethodError: undefined method move_to_bottom' for #<Page:0x3318ba4> from /opt/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/ active_record/base.rb:1860:inmethod_missing’
from (irb):8
from :0

I would be very pleased if you could help me …

2

Just for completness …
In fact I have to refer to the belongings table when interested by the
acts_as_list behavior. So:
c.belongings.first.move_to_bottom
And not:
c.elements.first.move_to_bottom
etc. etc.

And in my case the scope I meant wasn’t:
element_id=#{element_id} and element_type=#{quote_value
element_type}’
But:
collector_id
Since I want the elements inside a collection to act as a list.

On 14 nov, 13:46, peportier [email protected]