路由约束不能正确地为Rails参数分配值；使用“ +”分隔值 [英] Routing constraints don't assign values to a Rails parameter correctly; use '+' to delimit values

问题描述

我希望能够在我的应用程序的路线中支持国家或地区代码。例如：

I would like to be able to support country codes and region codes in my application's routes. For example:

• / entities / us


• / entities / us + ca


• / entities / us / mn


• / entities / us / mn / wi + ia


• / entities / us + ca / bc + wa

• /entities/us
• /entities/us+ca
• /entities/us/mn
• /entities/us/mn+wi+ia
• /entities/us+ca/bc+wa

我当前的路线：

  get "/entities/:country_code/(:region_code)" => "entities#index", :constraints => {:country_code=>/[a-zA-Z]{2}[\+\,]?/, :region_code=>/[a-zA-Z]{2}[\+\,]?/}
  resources :entities

尝试 / entities / us + ca 会导致以下异常：

# Use callbacks to share common setup or constraints between actions.
def set_entity
  @entity = Entity.find(params[:id])
end 

Application Trace | Framework Trace | Full Trace

app/controllers/entities_controller.rb:79:in `set_entity'

Request

Parameters:

{"id"=>"us+ca"}

我将路线更改为：

get "/entities/:country_code/(:region_code)" => "entities#index"
resources :entities

这允许多个国家和地区查询工作（即 us + ca 被分配给：country_code 参数），但这破坏了 / entities / new 路径- new 现在被认为是：country_code 参数。

This allows the multiple country and region query to work (i.e. us+ca is assigned to the :country_code parameter), but this broke the /entities/new path--new is now considered to be a :country_code parameter.

我假设问题与正则表达式有关。

I'm assuming that the problem is related the the regular expressions.

是否存在正则表达式

推荐答案

我认为您的正则表达式不太正确。您在那里的那个将匹配2个字符，并可选地跟一个 + 或，。您还需要允许后续的字符对。

I think your regex isn't quite right. The one you have there will match 2 characters optionally followed by a + or a ,. You need to also allow the subsequent character pairs.

尝试以下正则表达式： / [a-zA-Z] {2}（\ + [a-zA-Z] {2}）* / （匹配2个字符，后跟0个或多个 + 序列，后跟2个字符）。

Try this regex: /[a-zA-Z]{2}(\+[a-zA-Z]{2})*/ (that matches 2 characters followed by 0 or more sequences of + followed by 2 characters).

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