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Question

Rails can't render polymorphic associations to XML?

Answer 1

A:

From the Objective Resource google groups, seems like this is a feature that doesn't exist in Rails, so I ended up just using XML builder

ambertch 2010-05-03 01:41:51

Answer 2

A:

I could get this line to return the complete nested XML

format.xml { render :xml => @post.to_xml(:include => [ :links, :assets])}

like

<?xml version="1.0" encoding="UTF-8"?>
<post>
  <body>testing.../body>
  <created-at type="datetime">2010-09-21T06:19:13Z</created-at>
  <id type="integer">1</id>
  <title>1</title>
  <updated-at type="datetime">2010-09-21T06:19:13Z</updated-at>

  <links type="array"/>
  <assets type="array">
    <asset>
      <attachable-id type="integer">1</attachable-id>
      <attachable-type>Post</attachable-type>
      <created-at type="datetime">2010-09-21T06:19:13Z</created-at>
      <data-content-type>image/jpeg</data-content-type>

      <data-file-name>IMG00017-20100906-1226.jpg</data-file-name>
      <data-file-size type="integer">0</data-file-size>
      <id type="integer">1</id>
      <updated-at type="datetime">2010-09-21T06:19:13Z</updated-at>
    </asset>
  </assets>
</post>

Here is our model

class Post < ActiveRecord::Base
  has_many    :assets, :as => :attachable, :dependent => :destroy
  has_many    :links, :as => :linkable, :dependent => :destroy
...

Link Model

class Link < ActiveRecord::Base
  belongs_to :linkable, :polymorphic => true
...

Asset Model

class Asset < ActiveRecord::Base
 belongs_to :attachable, :polymorphic => true
...

In here, assets and links are not bound to any particular model. In the current usage, they are used in Post. Later on other models can use them.

is that what you are trying to achieve?

mv288 2010-09-21 07:41:25

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Rails can't render polymorphic associations to XML?

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