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/Ruby on Rails 6.0

class ActiveModel::MissingAttributeError

Parent:
NoMethodError

Raised when an attribute is not defined.

class User < ActiveRecord::Base
  has_many :pets
end

user = User.first
user.pets.select(:id).first.user_id
# => ActiveModel::MissingAttributeError: missing attribute: user_id

© 2004–2019 David Heinemeier Hansson
Licensed under the MIT License.