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module MyApp | |
module Parameters | |
class Base | |
include ActiveModel::Validations | |
class << self | |
attr_writer :parameter_names | |
def inherited(base) | |
super.tap do | |
base.parameter_names = parameter_names.dup | |
end | |
end | |
def parameter(parameter_name) | |
parameter_names << parameter_name | |
define_method(parameter_name) do | |
@parameters[parameter_name] | |
end | |
end | |
def parameter_names | |
@parameter_names ||= [] | |
end | |
end | |
def initialize(parameters) | |
@parameters = parameters | |
end | |
def to_hash | |
@parameters.slice(*self.class.parameter_names).symbolize_keys | |
end | |
end | |
end | |
end | |
# これをactionごとに書く | |
module MyApp | |
module Parameters | |
class CreatePreview < Base | |
parameter :raw_body | |
validates :raw_body, length: { allow_nil: false, minimum: 0 } | |
end | |
end | |
end | |
# controllerではこう使う | |
class PreviewsController < ApplicationController | |
before_action :require_valid_parameters_for_create_action, only: [:create] | |
def create | |
render json: Preview.new(params_for_create_action.to_hash) | |
end | |
private | |
def params_for_create_action | |
@params_for_create_action ||= MyApp::Parameters::CreatePreview.new(params) | |
end | |
def require_valid_parameters_for_create_action | |
raise MyApp::Errors::InvalidParameters, params_for_create_action unless params_for_create_action.valid? | |
end | |
end |
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validates :foo, bar: true
とかやるとBarValidatorが使われる。このBarValidatorとかをクラス間で共有できるので便利。あとクラスからvalidationのルールを取り出せるので、actionとクラスの命名規則を揃えておけば、actionの名前からvalidationのルールを取り出せるということになる。この情報からAPIのドキュメントを組み立てられる。