Exception: ActiveRecord::AssociationTypeMismatch

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, ActiveRecordError, StandardError
Instance Chain: self, ActiveRecordError, StandardError
Inherits:	ActiveRecord::ActiveRecordError ::Object StandardError ActiveRecord::ActiveRecordError ActiveRecord::AssociationTypeMismatch
Defined in:	activerecord/lib/active_record/errors.rb

Overview

Raised when an object assigned to an association has an incorrect type.

class Ticket < ActiveRecord::Base
  has_many :patches
end

class Patch < ActiveRecord::Base
  belongs_to :ticket
end

# Comments are not patches, this assignment raises AssociationTypeMismatch.
@ticket.patches << Comment.new(content: "Please attach tests to your patch.")