Class: RailsParam::ParamEvaluator

Inherits:
Object
  • Object
show all
Defined in:
lib/rails_param/param_evaluator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params, context = nil) ⇒ ParamEvaluator

Returns a new instance of ParamEvaluator.



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# File 'lib/rails_param/param_evaluator.rb', line 5

def initialize(params, context = nil)
  @params = params
  @context = context
end

Instance Attribute Details

#params ⇒ Object

Returns the value of attribute params.



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# File 'lib/rails_param/param_evaluator.rb', line 3

def params
  @params
end

Instance Method Details

#param!(name, type, options = {}, &block) ⇒ Object 



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# File 'lib/rails_param/param_evaluator.rb', line 10

def param!(name, type, options = {}, &block)
  name = name.is_a?(Integer)? name : name.to_s
  return unless params.include?(name) || check_param_presence?(options[:default]) || options[:required]

  parameter_name = @context ? "#{@context}[#{name}]" : name
  coerced_value = coerce(parameter_name, params[name], type, options)

  parameter = RailsParam::Parameter.new(
    name: parameter_name,
    value: coerced_value,
    type: type,
    options: options,
    &block
  )

  parameter.set_default if parameter.should_set_default?

  # validate presence
  if params[name].nil? && options[:required]
    raise InvalidParameterError.new(
      "Parameter #{parameter_name} is required",
      param: parameter_name,
      options: options
    )
  end

  recurse_on_parameter(parameter, &block) if block_given?

  # apply transformation
  parameter.transform if options[:transform]

  # validate
  validate!(parameter)

  # set params value
  params[name] = parameter.value
end