method

fetch

v5.0.0.1 - Show latest stable - Class: ActionController::Parameters

fetch(key, *args)

public

Returns a parameter for the given key. If the key can’t be found, there are several options: With no other arguments, it will raise an ActionController::ParameterMissing error; if more arguments are given, then that will be returned; if a block is given, then that will be run and its result returned.

params = ActionController::Parameters.new(person: { name: 'Francesco' })
params.fetch(:person)               # => {"name"=>"Francesco"}
params.fetch(:none)                 # => ActionController::ParameterMissing: param is missing or the value is empty: none
params.fetch(:none, 'Francesco')    # => "Francesco"
params.fetch(:none) { 'Francesco' } # => "Francesco"

# File actionpack/lib/action_controller/metal/strong_parameters.rb, line 428
    def fetch(key, *args)
      convert_value_to_parameters(
        @parameters.fetch(key) {
          if block_given?
            yield
          else
            args.fetch(0) { raise ActionController::ParameterMissing.new(key) }
          end
        }
      )
    end

fetch

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