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?
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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