Engine 文件下的内容

对外提供接口

实例方法：

app

config

eager_load!

endpoint

env_config

helpers
helpers_paths

load_console
load_generators
load_runner
load_seed
load_tasks

railties

routes

类方法：

endpoint

find
find_root

isolate_namespace

# 并且

isolated? & isolated

engine_name & railtie_name

其它方法：

delegate :middleware, :root, :paths, to: :config
delegate :engine_name, :isolated?, to: :class

有哪些 initializer ？

设置 load path 设置 autoload paths 添加 routing paths 添加 locales 添加 view paths 加载 environment config Append assets path Prepend helpers path 加载 config initializers Engines blank point