class ActionController::UnpermittedParameters

# => ActionController::UnpermittedParameters: found unexpected keys: a, b
params.permit(:c)
params = ActionController::Parameters.new(a: “123”, b: “456”)
Raised when a supplied parameter is not expected.

def initialize(params) # :nodoc:

:nodoc: 
def initialize(params) # :nodoc:
  @params = params
  super("found unpermitted parameters: #{params.join(", ")}")
end