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Exception: ActionController::ParameterMissing

Relationships & Source Files
Namespace Children
Classes:
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, KeyError
Instance Chain:
self, KeyError
Inherits: KeyError
  • ::Object
Defined in: actionpack/lib/action_controller/metal/strong_parameters.rb

Overview

Raised when a required parameter is missing.

params = ActionController::Parameters.new(a: {})
params.fetch(:b)
# => ActionController::ParameterMissing: param is missing or the value is empty: b
params.require(:a)
# => ActionController::ParameterMissing: param is missing or the value is empty: a