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Problem combining single table inheritance and a has_many relation
Reported by Stefan Kroes | May 3rd, 2008 @ 02:22 PM
Hi all!
I think I've found a bug that occurs when combining single table inheritance with a has_many relation.
My models look something like this:
class Content < ActiveRecord::Base
inheritance_column = 'inheritance_type'
has_many :children, :class_name => 'Content', :foreign_key => 'parent_id'
end
class Page < Content
end
class Section < Content
end
When I have the following data in my database, for example:
{ id => 1, parent_id => nil, inheritance_type => 'Page' }
{ id => 2, parent_id => 1, inheritance_type => 'Section' }
{ id => 3, parent_id => 1, inheritance_type => 'Section' }
Page.find(:all)
Will return one page object and two section objects
Page.find(1).children
Will return two content objects while I'd expect it to return two section objects
Comments and changes to this ticket
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Stephen Celis May 10th, 2008 @ 02:45 PM
I don't think this is a bug.
To use the assignment method, you need to explicitly call "self":
self.inheritance_column = 'inheritance_type'Or, use this friendly method:
set_inheritance_column = 'inheritance_type'Of course, once the inheritance_column is set, your has_many is going to break: I'm pretty sure it's only going to pick up objects with the class name "Content" (not "Section"), because the relationship isn't really polymorphic.
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Stephen Celis May 10th, 2008 @ 05:19 PM
Oops, that second one isn't assignment:
set_inheritance_column 'inheritance_type' -
josh June 13th, 2008 @ 06:57 AM
- State changed from “new” to “invalid”
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josh
Stefan Kroes
Stephen Celis
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