Ruby on Rails

Xavier Snark wrote:

> I am learning Rails and have run into a bit of difficulty with something
> I suspect is not uncommon, but I'm having difficulty getting my point
> across to Google.
> [snip]
> when I am creating a new event record
> [snip]

I think you've minced some concepts here.

http://guides.rubyonrails.org/association_basics.html#polymorphic-associations
states that you can access the nested model through an instance that has
a polymorphic association with another model, eg. "From an instance of
the Employee model, you can retrieve a collection of pictures:
@employee.pictures."

Polymorphic associations give you the abilities that you're after, but
not entirely. I believe that when you are creating and updating, you
need to rely on NestedAttributes of the ActiveRecord model in order to
use a single form for updating both the "subject" record and the related
record.

http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html

I haven't successfully used this, but the documentation suggests that
you must update your "subject" model with the
'accepts_nested_attributes_for :secondary' where :secondary is the
nested model in order to manipulate the related record through the
subject record's controller. This gives you the ability to modify the
related record through values supplied in the request params hash.

X
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