Module: RailsParam::Param

Included in:
MockController
Defined in:
lib/rails_param/param.rb

Defined Under Namespace

Classes: InvalidParameterError, MockController

Constant Summary collapse

DEFAULT_PRECISION = 
14

Instance Method Summary collapse

Instance Method Details

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



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# File 'lib/rails_param/param.rb', line 20

def param!(name, type, options = {}, &block)
  name = name.to_s unless name.is_a? Integer # keep index for validating elements

  return unless params.include?(name) || check_param_presence?(options[:default]) || options[:required]

  begin
    params[name] = coerce(params[name], type, options)

    # set default
    if options[:default].respond_to?(:call)
      params[name] = options[:default].call
    elsif params[name].nil? && check_param_presence?(options[:default])
      params[name] = options[:default]
    end

    # apply tranformation
    if params[name] && options[:transform]
      params[name] = options[:transform].to_proc.call(params[name])
    end

    # validate
    validate!(params[name], name, options)

    if block_given?
      if type == Array
        params[name].each_with_index do |element, i|
          if element.is_a?(Hash) || element.is_a?(ActionController::Parameters)
            recurse element, &block
          else
            params[name][i] = recurse({ i => element }, i, &block) # supply index as key unless value is hash
          end
        end
      else
        recurse params[name], &block
      end
    end

    # rename
    if params[name] && options[:rename_to]
      params[options[:rename_to]] = params.delete(name)
      name = options[:rename_to]
    end

    params[name]

  rescue InvalidParameterError => exception
    exception.param ||= name
    exception.options ||= options
    raise exception
  end
end