Rails - 从 Rails 配置中获取命名空间常量 [英] Rails - Get namespaced constant from Rails configuration

问题描述

假设我有几个搜索引擎的实现.

Suppose I have several implementations for a search engine.

module Searcher
  module Engine
    class Elasticsearch
    end

    class Algolia
    end
  end
end

我想要每个环境的搜索引擎配置.

I want a per-environment search engine configuration.

我在我的环境中声明了配置(对于某种桥接模式)

I declared the config in my environment (for some sort of Bridge Pattern)

Rails.application.configure do
  config.search_engine = :elasticsearch
end

(我在特定环境文件中覆盖)

(Which I override in specific environment files)

然后在我的搜索控制器中，我想根据我在 Rails.configuration.search_engine 中放置的符号加载相应的类

Then in my search controller, I want to load the appropriate class according to the symbol I put in Rails.configuration.search_engine

@search_engine = Searcher::Engine::XXX
@search_engine.search

如何从符号 :elasticsearch 解析完整的命名空间常量 Searcher::Engine::XXX ?

How do I resolve the full namespaced constant Searcher::Engine::XXX from the symbol :elasticsearch ?

Searcher::Engine.const_get(Rails.configuration.search_engine.to_s.titleize)

不起作用:它加载 Elasticsearch(来自 gem)而不是 Searcher::Engine::Elasticsearch(我自己的组件)

Does not work : it loads Elasticsearch (from the gem) and not Searcher::Engine::Elasticsearch (my own component)

::Searcher::Engine::Elasticsearch # => Searcher::Engine::Elasticsearch
Searcher::Engine.const_get(Rails.configuration.search_engine.to_s.titleize) # => Elasticsearch
Object.const_get("::Searcher::Engine::#{Rails.configuration.search_engine.to_s.titleize}") # => Elasticsearch

红宝石 2.3.0导轨 5

Ruby 2.3.0 Rails 5

推荐答案

假设你的搜索引擎都在 ::Searcher::Engine 下:

Assuming your search engines are all under ::Searcher::Engine:

"::Searcher::Engine::#{Rails.configuration.search_engine.to_s.titleize}".constantize

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