method

fetch

Importance_2
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 not found: none params.fetch(:none, 'Francesco') # => "Francesco" params.fetch(:none) { 'Francesco' } # => "Francesco"
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