method

require

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What's this?

require(key) public

Ensures that a parameter is present. If it’s present, returns the parameter at the given key, otherwise raises an ActionController::ParameterMissing error.

ActionController::Parameters.new(person: { name: 'Francesco' }).require(:person)
# => {"name"=>"Francesco"}

ActionController::Parameters.new(person: nil).require(:person)
# => ActionController::ParameterMissing: param not found: person

ActionController::Parameters.new(person: {}).require(:person)
# => ActionController::ParameterMissing: param not found: person

Show source

# File actionpack/lib/action_controller/metal/strong_parameters.rb, line 182
    def require(key)
      value = self[key]
      if value.present? || value == false
        value
      else
        raise ParameterMissing.new(key)
      end
    end

require

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