class ParameterMissing
Ruby on Rails 7.0.10
Since v4.0.13Raised 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