ruby-on-rails-4 - 使用 splat 匹配路线。它有什么作用？

Question

我看到这条路线:

将“*a”匹配到:“application#some_error_handler”，通过::all

这在 Rails 中起什么作用？这是一个“a”吗？

Answer 1

这称为路由通配，并在 Routing guide's section on route globbing 中进行了解释。 :

Route globbing is a way to specify that a particular parameter should be matched to all the remaining parts of a route. For example:

get 'photos/*other', to: 'photos#unknown'

This route would match photos/12 or /photos/long/path/to/12, setting params[:other] to "12" or "long/path/to/12". The fragments prefixed with a star are called "wildcard segments".

Wildcard segments can occur anywhere in a route. For example:

get 'books/*section/:title', to: 'books#show'