Hi to all,
I have this error and I don't understand why. I have three model,
Image and Playlist and PlaylistItem. Everything works fine. The app
should work also a XML REST service. When I made this call I obtain
this XML because the playlist don't contains images:

GET http://0.0.0.0:3000/playlists/7.xml
<playlist>
  <id>7</id>
  <name>metallo</name>
  <images></images>
</playlist>

I would put some images in playlist (the images are already presents
on server) I should made this call:

PUT http://0.0.0.0:3000/playlists/7.xml

<playlist>
    <id>7</id>
    <name>metal</name>
    <images>
        <image>
            <id>1</id>
            <name>gino</name>
        </image>
        <image>
            <id>2</id>
            <name>pino</name>
        </image>
    </images>
</playlist>

but I obtain this error:

ActiveRecord::AssociationTypeMismatch in PlaylistsController#update
Image(#87559180) expected, got Array(#78093260)

parameters:
{"playlist"=>{"id"=>"7",
 "name"=>"metal",
 "images"=>{"image"=>[{"id"=>"1",
 "name"=>"gino"},
 {"id"=>"2",
 "name"=>"pino"}]}},
 "id"=>"7",
 "format"=>"xml"}

This are the three models:

class Image < ActiveRecord::Base
  attr_accessor :picture
  validates :name, :uniqueness => true, :presence => true
  validates :picture, :presence => true

  has_many :playlist_items
  has_many :playlists, :through => :playlist_items
end

class Playlist < ActiveRecord::Base
  validates :name, :presence => true, :uniqueness => true

  has_many :playlist_items
  has_many :images, :through => :playlist_items
  accepts_nested_attributes_for :images, :allow_destroy => true
end

class PlaylistItem < ActiveRecord::Base
  belongs_to :image
  belongs_to :playlist
end

The project can be found here: https://github.com/gpad/rms

can anybody help?

thanks
Gianluca

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