Chris Bloom wrote:
> Alternate subject title: Validate child of unsaved parent based on
> grandparent attr?
>
> I've got a create view with a form for both the parent object as well as
> multiple child objects. Upon submit, can I validate the parent and child
> objects before either are saved? There are a few caveats:
>
> 1.) The validation of one attribute on all the child objects is based on
> an attribute of the parent's parent! (The grandparent object is already
> saved)
>
> 2.) The parent object may have an attachment that must also be valid.
> (using attachment_fu)
>
> class Project
> has_one :settlement
> end
>
> class Settlement
> belongs_to :project
> has_many :details,
> :class_name => 'SettlementDetail',
> :dependent => :delete_all do
> def total_quantity
> inject(0){|sum, p| sum + (p.quantity.nil? ? 0 : p.quantity)}
> end
>
> def total_weight
> inject(0){|sum, p| sum + (p.weight.nil? ? 0 : p.weight)}
> end
> end
> end
>
> class SettlementDetail < ActiveRecord::Base
> belongs_to :settlement
>
> validates_presence_of :quantity, :if => :quantity_required
>
> def quantity_required
> ### TODO Will this work on a new detail object with an unsaved
> ### parent settlement object?
Yes, as long as you set the settlement association of each
settlement_detail child you build to the new settlement object,
and also set the project association of that settlement object.
>
> if self.settlement.project.billing_method == "Weight"
> # We don't need to validate because the billing method is Weight
> return false
> else
> # Count is required
> return true
> end
> end
> end
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