On Thursday, June 28, 2012 5:06:11 PM UTC-7, Jack wrote:
>
> I have a parent model, Product, that has many Variants. I'm using
> nested_attributes on the Product model. On the Variants model I have a
> presence validation on the :product. When I try to persist the product with
> some :variants_attributes, I get a validation error saying:
>
> gems/sequel-3.36.1/lib/sequel/model/base.rb:1228:in `save': variants
> product is not present (Sequel::ValidationFailed)
>
> If I remove that validation, the product_id gets set correctly in the
> Variant table. Do I have to manually set the product_id somewhere so that
> the validation can pass? It seems like the id is set on save, so the
> validation fails because valid? is called before save.
>
Here's the probable order of events:
1) Product and Variants get validated
2) Product gets saved
3) Variants get saved
You are getting the error because the nested_attributes plugin does the
validation of the associated objects at the same time it validates the
current object, which is before saving the current object. This is by
design so that validation errors in associated objects prevent saving of
the current object.
In the case of a new Product, the product's id will not be available until
after saving, so it's not like you could cheat and assign the keys earlier
in that case. You probably need to either remove that validation from
Variant (or move the check into a before_save hook), or make it conditional
and set some flag that disables it when it is being created via
nested_attributes, i.e.:
def variants_attributes=(vs)
super
associations[:variants].each{|v| v.check_product = false}
end
Jeremy
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