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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
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.")