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Gianluca Padovani

2011-Nov-24 10:10 UTC

ActiveRecord::AssociationTypeMismatch

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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Matt Jones

2011-Nov-26 00:22 UTC

head link

Re: ActiveRecord::AssociationTypeMismatch

On Nov 24, 5:10 am, Gianluca Padovani
<gpadov...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> 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:
>
> GEThttp://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:
>
> PUThttp://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"}
Looks like you need a slightly different format for the XML:

http://stackoverflow.com/questions/4698266/creating-multiple-resources-in-a-single-restful-post-in-rails

--Matt Jones

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newrails user

2011-Nov-26 02:40 UTC

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Re: ActiveRecord::AssociationTypeMismatch

I got also faced this error . when I was using same column name in two
different tables and trying to access them.I renamed the column in one of
the tables and it started working.

--RorUser

On Thu, Nov 24, 2011 at 3:40 PM, Gianluca Padovani
<gpadovani-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>wrote:
> 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
>
> --
> You received this message because you are subscribed to the Google Groups
> "Ruby on Rails: Talk" group.
> To post to this group, send email to
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> To unsubscribe from this group, send email to
>
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> For more options, visit this group at
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>
>
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Sergio Angeletti - www.primevoices.com

2011-Nov-26 04:40 UTC

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Re: ActiveRecord::AssociationTypeMismatch

Gracias el de una semana es para la semana del 4 al 10. De diciembre

SERGIO
On Nov 24, 2011 7:24 AM, "Gianluca Padovani"
<gpadovani-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> 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
>
> --
> You received this message because you are subscribed to the Google Groups
> "Ruby on Rails: Talk" group.
> To post to this group, send email to
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> To unsubscribe from this group, send email to
>
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>
>
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Gianluca Padovani

2011-Nov-28 12:41 UTC

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Re: Re: ActiveRecord::AssociationTypeMismatch

2011/11/26 Matt Jones
<al2o3cr-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:> Looks like you need a slightly different format for the XML:
>
>
http://stackoverflow.com/questions/4698266/creating-multiple-resources-in-a-single-restful-post-in-rails
I try this type of XML

<playlist>
  <id>7</id>
  <name>metal</name>
  <images_attributes type="array">
    <image>
      <id>3</id>
    </image>
  </images_attributes>
</playlist>

but I receive this error:

Couldn''t find Image with ID=3 for Playlist with ID=7

app/controllers/playlists_controller.rb:43:in `block in update''
app/controllers/playlists_controller.rb:42:in `update''

"playlist"=>{"id"=>"7",
 "name"=>"metal",
 "images_attributes"=>[{"id"=>"3"}]},
 "id"=>"7",
 "format"=>"xml"}

The image ID 3 already exist!

It''s very strange ... I don''t think I''m in a case
corner, It''s common
in REST service have  this type of information ...

bye
Gianluca

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Gianluca Padovani

2011-Nov-29 17:37 UTC

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Re: Re: ActiveRecord::AssociationTypeMismatch

Hi to all,
I think I have understand the problem. When you made a PUT of this type:

<playlist>
 <id>7</id>
 <name>metal</name>
 <images_attributes type="array">
   <image>
     <id>3</id>
   </image>
 </images_attributes>
</playlist>

Rails suppose that:

Or your are creating the playlist and the image or you are updating
the relationship inside the playlist, see the method
assign_nested_attributes_for_collection_association in
activerecord-3.0.10/lib/active_record/associations/has_many_through_association.rb

In may case I have already all the image in the play list and I would
create a playlist selecting some images ...

How can I obtain this behavior?

thanks
Gianluca

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