You can write your own custom validator, based on the code for the built-in validator.
Looking up the source code for validates_associated, we see that it uses the “AssociatedValidator”. The source code for that is:
module ActiveRecord
module Validations
class AssociatedValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
if Array.wrap(value).reject {|r| r.marked_for_destruction? || r.valid?}.any?
record.errors.add(attribute, :invalid, options.merge(:value => value))
end
end
end
module ClassMethods
def validates_associated(*attr_names)
validates_with AssociatedValidator, _merge_attributes(attr_names)
end
end
end
end
So you can use this as an example to create a custom validator that bubbles error messages like this (for instance, add this code to an initializer in config/initializers/associated_bubbling_validator.rb
):
module ActiveRecord
module Validations
class AssociatedBubblingValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
((value.kind_of?(Enumerable) || value.kind_of?(ActiveRecord::Relation)) ? value : [value]).each do |v|
unless v.valid?
v.errors.full_messages.each do |msg|
record.errors.add(attribute, msg, options.merge(:value => value))
end
end
end
end
end
module ClassMethods
def validates_associated_bubbling(*attr_names)
validates_with AssociatedBubblingValidator, _merge_attributes(attr_names)
end
end
end
end
So you can now validate like so:
class User < ActiveRecord::Base
validates_associated_bubbling :account
end
Also, be sure to add a validate: false
in your has_many
association, otherwise, Rails will validate the association by default and you’ll end up with two error messages, one given by your new AssociatedBubblingValidator and one generic given by Rails.