Ruby on Rails - nested attributes: How do I access the parent model from child model
- by TMaYaD
I have a couple of models like so
class Bill < ActiveRecord::Base
has_many :bill_items
belongs_to :store
accepts_nested_attributes_for :bill_items
end
class BillItem <ActiveRecord::Base
belongs_to :product
belongs_to :bill
validate :has_enough_stock
def has_enough_stock
stock_available = Inventory.product_is(self.product).store_is(self.bill.store).one.quantity
errors.add(:quantity, "only #{stock_available} is available") if stock_available < self.quantity
end
end
The above validation so obviously doesn't work because when I'm reading the bill_items from nested attributes inside the bill form, the attributes bill_item.bill_id or bill_item.bill are not available before being saved.
So how do I go about doing something like that?
