StackOverflow2013

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7803075
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0
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2
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2011-10-18T06:06:01.767
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2011-10-18T06:06:01.767
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190988
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7802819
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To access the images from an article you need to add an association in the Article class: <pre><code>class Article has_many :images, :foreign_key => :association_id end </code></pre> You mentioned that sometimes images are mapped to travel_guides and slideshows (2 additional tables). You have to add an association for each table. So you might do something like: <pre><code>class Article < ActiveRecord::Base has_many :images, :foreign_key => :association_id has_many :travel_guides, :foreign_key => :association_id has_many :slideshow_images, :foreign_key => :association_id end </code></pre> It is generally also a good idea to set up the reverse associations: <pre><code>class Image < ActiveRecord::Base belongs_to :article, :foreign_key => :association_id end class TravelGuide < ActiveRecord::Base belongs_to :article, :foreign_key => :association_id end class SlideshowImage < ActiveRecord::Base set_table_name :slideshows belongs_to :article, :foreign_key => :association_id end </code></pre> Some things to consider: <ul> <li>I left off the :dependent option in the *has_many* associations. This is generally not a good idea. You can set :depedent => :destroy so that you can call some cleanup logic in your image classes (to delete the image files).</li> <li>If you do not have simple joins, you should consider adding the :conditions option to the has_many (or the belongs to). </li> <li>Single table inheritance and or polymorhpic associations are both other tools you can use if the above suggestions don't solve all of your problems.</li> </ul>
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1. POhow do I build an association between 2 fields that do not follow any naming convention?
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1. USTrevor Rowe
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1. COTo clarify: it is not "article" that has many travel_guides or slideshows. Rather, "images" is polymorphic, and can belong to either "article" or "travel_guides" or "slideshows" (or "magazines").
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2. COI can not get this work, sad to say. If I type "rails c" and run the query, I get back an array that has the article info, but not the image info.
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Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.