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Alex Rivera
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It seems that in rails you can define association validations in two places, either on the association itself: class Child belongs_to :parent, :validate => true end Or as a validation callback: class Child belongs_to :parent validates_associated :parent end What is the difference between these two methods? Testing the difference I thought that maybe the former creates a backpressure and enforces that the parent is only valid if the child is valid: i.e. (when setting :validate => true) child.valid? # => false child.parent.valid? # => also evaluates to false because of the :validate => true condition # do whatever it takes to make the child valid again #... child.valid? # => true child.parent.valid? # => true However I tested it and this doesn't happen. So what's the difference (if any) between the two methods?
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