# Generator

**url\_for 方法的重要组成部分。**

```ruby
module ActionDispatch
  module Routing
    class RouteSet
      def generate(route_key, options, recall = {})
        Generator.new(route_key, options, recall, self).generate
      end
    end
  end
end
```

生成失败的话，会报 UrlGenerationError 错误。

各个实例方法：

```ruby
generate

# 以下几个方法 initialize 时被调用
normalize_recall!
normalize_options!
normalize_controller_action_id!
use_relative_controller!
normalize_controller!
normalize_action!
```

initialize 和 `generate` 对外提供的接口。

除上述外，还有：

```
use_recall_for

controller
current_controller

different_controller?
```

和

```ruby
attr_reader :options, :recall, :set, :named_route
```


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