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has_many in rails

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+2 A:

In your service ticket model, you can add a technician relationship like...

belongs_to :technician, :class_name => "User"

It will use the User model in this case for the technician_id

Beerlington 2010-06-10 18:49:03

Thanks for the quick reply, unfortunately when I entered the suggested constraint into my model, then typed the following code into my view: <% @service_tickets.each do |s| %> <%= s.technician.first_name %> <% end %>I get the following error: "undefined method `first_name' for nil:NilClass"Any ideas what this could be? Do I have to put anything other than "has_many :service_tickets" in the user model?

2010-06-11 12:04:43

By the way, the user model does have a field called 'first_name' in it.

2010-06-11 12:05:35

After rebooting the server, your code worked! Never mind on my previous posts. Thank you!By the way, I put a :foreign_key setting on the end which I read about online like this: belongs_to :technician, :class_name => "User", :foreign_key => "technician_id"Is that okay?

2010-06-11 15:27:46

You shouldn't need to add the `foreign_key` option unless belongs_to "xxx" is different than what you call it in the foreign key table. In your case, using `belongs_to :technician` expects a a field in the service ticket called technician_id. If you were to call it something like "tech_id" in the service ticket table, then you would have needed :foreign_key => "tech_id". See http://rails.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#M001318 for more.

Beerlington 2010-06-13 03:49:20

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