Problem with belongs_to association model naming
Reported by Dan Higham | February 1st, 2008 @ 05:31 PM
It seems when a model has a belongs_to association to a foreign model where the foreign model ends in an "s" an error is raised when trying to use that association.
For example if you have a model called ticket and that ticket has an association to a model called status through a belongs_to association i.e
Class Ticket < DataMapper::Base
property :title, :string, :nullable => false
property :description, :text
belongs_to :status
End
Class Status
property :name, :string, :nullable => false
End
Calling the status property on the ticket causes the following error;
undefined method `to_sym' for nil:NilClass"
hope that makes sense!
Comments and changes to this ticket
-
asceth February 1st, 2008 @ 09:52 PM
Change your Ticket class to have:
class Ticket < DataMapper::Base property :title, :string, :nullable => false property :description, :text belongs_to :status, :class => Status endYou probably want to put a has_many or has_one in the Status class as well:
class Status property :name, :string, :nullable => false has_many :tickets endThe reason behind this is that in belongs_to the class name is passed through the inflector causing problems so defining it like I listed above fixes the problem. I believe afrench is adding this into the documentation to clarify it for future use.
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Dan Higham February 2nd, 2008 @ 02:30 PM
Works like a treat! I did add :class => 'Status' but this didn't work, how come it works by passing actual reference to the class itself?
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asceth February 3rd, 2008 @ 01:26 PM
When you pass a String it still runs through the inflector which assigns the association_constant_name to Statu. Passing the actual reference does not go through the inflector and assigns it properly.
-
Adam French February 9th, 2008 @ 07:17 PM
- State changed from “new” to “open”
things working?
can we close this bad boy out?
-
Nick Plante February 15th, 2008 @ 05:23 PM
- State changed from “open” to “resolved”
Working as described here. Pls reopen if you feel there is still an issue.
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Nick Plante
Rick