Send a array of objects from a view

rubyonrails-talk
1

Hi everyone.

I´m working on application that has a "has_and_belongs_to_many" betwen two models: "expedientes" and "documentos". When I´m on the console, I need to pass a Expedientes Array to documentos, otherwise I get a ActiveRecord::AssociationTypeMismatch exception.

Example:

d=Documento.new

=> #<Documento id: nil...

d.expedientes=[1]

ActiveRecord::AssociationTypeMismatch: Expediente(#18729340) expected, got Fixnum(#108610)   ...

d.expedientes="1"

ActiveRecord::AssociationTypeMismatch: Expediente(#18729340) expected, got String(#113650) ...

d.expedientes=Expediente.find("1")

NoMethodError: undefined method `each' for #<Expediente:0x23a96a0> ...

d.expedientes=[Expediente.find("1")]

=> [#<Expediente id: 1, ...That´s ok!

How must I made this relationship from the view? I´ve mading a Form.hidden_field from the view "new" with the name "expedientes" and the value of the expediente.id of the relationship,but seems incorrect.

What´s the best way to do that?

2

The best way (for me) is using nested attributes (http:// api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ ClassMethods.html). You can look a very complete example of usage in: http://github.com/alloy/complex-form-examples/tree/master and in http://github.com/soldieron/jquery-nested-forms/tree/master

Regards.

Franco Catena.

3

Thanks Franco...