为什么current_page？当我在完全托管的资源上执行时返回`无路由错误'？

Question

我有以下途径：

resources :profiles do 
    member do 
     patch :speed_rating 
     patch :dribbling_rating 
     patch :passing_rating 
     patch :tackling_rating 
     post :favorite 
     post :unfavorite 
    end 
    collection do 
     get :autocomplete 
    end 
    end 

这产生，我喜欢下面的路线：

# truncated for brevity 
profiles_path GET /profiles(.:format) profiles#index 

profile_path GET /profiles/:id(.:format) profiles#show 

在我application.html.erb，我有这样的：

<% if current_page?(controller: "profiles", action: "show")%> 
     <div id="page-wrapper" class="gray-bg"> 
    <% else %> 
     <div id="page-wrapper" class="image-bg"> 
    <% end %> 

当我去我的Profiles#Show它工作正常，但当我去我的Profiles#Index（又名我的root_path），我得到了其他的东西：

Started GET "/" for ::1 at 2016-11-07 16:52:01 -0500 
    User Load (1.9ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT $2 [["id", 7], ["LIMIT", 1]] 
Processing by ProfilesController#index as HTML 
    Role Load (4.8ms) SELECT "roles".* FROM "roles" INNER JOIN "users_roles" ON "roles"."id" = "users_roles"."role_id" WHERE "users_roles"."user_id" = $1 AND (((roles.name = 'admin') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL))) [["user_id", 7]] 
    Role Load (12.9ms) SELECT "roles".* FROM "roles" INNER JOIN "users_roles" ON "roles"."id" = "users_roles"."role_id" WHERE "users_roles"."user_id" = $1 AND (((roles.name = 'coach') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL))) [["user_id", 7]] 
    Role Load (6.7ms) SELECT "roles".* FROM "roles" INNER JOIN "users_roles" ON "roles"."id" = "users_roles"."role_id" WHERE "users_roles"."user_id" = $1 AND (((roles.name = 'player') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL))) [["user_id", 7]] 
    (4.9ms) SELECT COUNT(*) FROM "roles" INNER JOIN "users_roles" ON "roles"."id" = "users_roles"."role_id" WHERE "users_roles"."user_id" = $1 AND (((roles.name = 'admin') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL)) OR ((roles.name = 'coach') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL))) [["user_id", 7]] 
    CACHE (0.0ms) SELECT "roles".* FROM "roles" INNER JOIN "users_roles" ON "roles"."id" = "users_roles"."role_id" WHERE "users_roles"."user_id" = $1 AND (((roles.name = 'player') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL))) [["user_id", 7]] 
    (2.6ms) SELECT COUNT(*) FROM "roles" INNER JOIN "users_roles" ON "roles"."id" = "users_roles"."role_id" WHERE "users_roles"."user_id" = $1 AND (((roles.name = 'coach') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL)) OR ((roles.name = 'admin') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL))) [["user_id", 7]] 
    Profile Search (23.5ms) curl http://localhost:9200/profiles_development/_search?pretty -d '{"query":{"match_all":{}},"size":1000,"from":0,"timeout":"11s","_source":false}' 
    Tournament Load (2.7ms) SELECT "tournaments".* FROM "tournaments" ORDER BY "tournaments"."id" ASC LIMIT $1 [["LIMIT", 1]] 
    Rendering profiles/index.html.erb within layouts/application 
    Profile Load (1.7ms) SELECT "profiles".* FROM "profiles" WHERE "profiles"."id" IN (14, 22, 12, 21, 9, 5, 4, 15, 6, 7, 16, 18, 13, 23, 17) 
Read fragment views//profiles/14-20161105042425134917/profiles/22-20161106175803133611/profiles/12-20161101225114614189/profiles/21-20161103035514173735/profiles/9-20161104221706306433/profiles/5-20161105043153971213/profiles/4-20161103035528589634/profiles/15-20161029013919242687/profiles/6-20161105043216951643/profiles/7-20161101001052922220/profiles/16-20161029020526832889/profiles/18-20161101223838805685/profiles/13-20161104221749051281/profiles/23-20161104062851335443/profiles/17-20161105043606243802/af785066fd895798884eea54748241db (0.1ms) 
    Rendered profiles/index.html.erb within layouts/application (12.5ms) 
Completed 500 Internal Server Error in 379ms (ActiveRecord: 36.4ms) 


ActionController::UrlGenerationError - No route matches {:action=>"show", :controller=>"profiles"}: 

编辑1

为了记录在案，没有问题了以下工作：

<% if (controller_name.eql? "profiles") && (action_name.eql? "show") %> 

Answer 1

如果你看一看current_page?source code你会发现它使用url_for，这实际上需要有效的选项来构建一个网址并与您在地址栏中看到的网址相匹配。

url_for(controller: "profiles", action: "show")如果没有:id将无法​​找到该路线。如果您尝试使用current_page?(controller: "profiles", action: "show", id: 1)，则会看到不会引发错误。

current_page不适合这个工作你最好的选择，因为它的目的是测试一个完美的比赛，包括其他的查询字符串参数，如：

# http://www.example.com/shop/checkout?order=desc&page=1 
current_page?(controller: 'shop', action: 'checkout', order: 'desc', page: '1') 

你的具体情况，你希望它匹配任何页面呈现显示操作。我认为您在您的解决方案中提供的解决方案是适合的。如果你想清理它，你总是可以把它包装在你自己的帮手里。