On Viernes, 7 de Mayo de 2010 01:03:38 Iñaki Baz Castillo escribió:
> Hi, I'm not sure if the following is a common issue in ActiveRecords
> or in ActiveScaffold and how it manages models in subforms:
>
> - Client has_many Routes (through "client_id" in "routes" table as usual).
>
> - In Client model I need this validation:
> validates_presence_of :client_id, :if => Proc.new { |route|
> route.enabled }
Validations should be added to association:
validates_presence_of :client, :if => Proc.new { |route| route.enabled }
>
> - I need such validation because it's also possible to directly create
> Routes in a separate way (without the need of creating a Client and a
> Route(s) belonging ot it). In such case I need to ensure that the
> route entry belongs to a Client just if the "enabled" field is checked
> (in the Clientcontroller subform for Route such checkbox is hidden).
>
> - If I want to create a Client with a Route (by filling the subform)
> then I get this error:
> "client_id cannot be empty"
>
You get that error because client is not saved when validations are checked,
so it has no id and client_id is still nil. If you set the validation in
client association, it will work.
> I think this error occurs because AS creates first the Route model
> (just in memory, not yet in DB) for which, of course, there is not yet
> a client_value, am I right? what is the workaround for this?
There is a client in route, but there is no client_id. The actual code is
like:
@record = Client.new [some params]
@record.routes.build [some params]
@record.save if @record.valid? && @record.routes.all?(&:valid?)
Associations are set when valid? is called, but primary keys aren't set
because records are not saved yet.
>
> PS: If this is a pure ActiveRecord related question please just tell
> it to me so I'll investigate in Rails/ActiveRecords forums.
Really is an ActiveRecord related question, because the usual way to save a
record with associations from a form is build all records, check validations
and after that save them. So you should add validations in associations
instead of foreign keys.
Also, I wouldn't add a validation for client present if a route can exist
without client. When you are filling a client form with routes subforms you
ensure in the controller client is set, so I would remove that validation and
hidden field
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