[Rails] error message of a child object

class TranslationKey < ActiveRecord::Base
has_many :key_values
has_many :translation_values, :through => :key_values
validates_uniqueness_of :name, :message => "already exist in another
key"
end

class TranslationValue < ActiveRecord::Base
has_many :key_values
has_many :translation_keys, :through => :key_values
has_many :languages
validates_presence_of :text, :message => "can't be empty"
end

in my update action of Key, if the key has non-valid value object I
see this error message:
"Translation values is invalid"

why don't I see: "already exist in another key" instead?

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