Exception: ActionController::ParameterMissing

Inherits:
KeyError
  • Object
show all
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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(param) ⇒ ParameterMissing

:nodoc:


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# File 'actionpack/lib/action_controller/metal/strong_parameters.rb', line 24

def initialize(param) # :nodoc:
  @param = param
  super("param is missing or the value is empty: #{param}")
end

Instance Attribute Details

#paramObject (readonly)

:nodoc:


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# File 'actionpack/lib/action_controller/metal/strong_parameters.rb', line 22

def param
  @param
end