Rails的兩次

我有一個PagesController在那裏我創造這樣一個新的紀錄：Rails的兩次

def new 
    @page = Page.create(status: "draft", title: "Temporary title") 
    end

我使用Page.create因爲用戶應該能夠立即向add page_items到新的一頁，該協會需要一個帶有ID的記錄。

問題是，無論何時點擊「新記錄」，我都會創建兩條新記錄。不只是一個。

編輯：該問題似乎與Turbolinks有關。如果我使用正常的「新頁面」鏈接，則向服務器發出兩個請求，因此會創建兩個頁面。如果我手動訪問鏈接或在新標籤中打開鏈接，我會得到一條記錄。

這個問題是整個應用程序。所有鏈接都會向服務器創建兩個獲取請求。

編輯2：這裏是當我點擊「新的一頁」鏈接的服務器響應：

Started GET "/pages/new" for 127.0.0.1 at 2014-02-28 22:39:41 +0100 
Processing by PagesController#new as HTML 
    User Load (0.6ms) SELECT "users".* FROM "users" WHERE "users"."auth_token" = '040__V_8SbdLhYxbjd1sYQ' LIMIT 1 
    User Load (0.3ms) SELECT "users".* FROM "users" WHERE "users"."subdomain" = 'ohenrik' LIMIT 1 
    Page Load (0.3ms) SELECT "pages".* FROM "pages" WHERE "pages"."id" IN (3) 
    (0.1ms) BEGIN 
    SQL (0.4ms) INSERT INTO "pages" ("created_at", "status", "title", "updated_at") VALUES ($1, $2, $3, $4) RETURNING "id" [["created_at", Fri, 28 Feb 2014 21:39:41 UTC +00:00], ["status", "draft"], ["title", "Temporary title"], ["updated_at", Fri, 28 Feb 2014 21:39:41 UTC +00:00]] 
    (1.1ms) COMMIT 
    Rendered shared/_form_errors.html.erb (0.0ms) 
    Rendered pages/_rich_link_button.erb (0.0ms) 
    Rendered pages/_rich_content_toolbar.erb (0.6ms) 
    Rendered pages/_rich_link_button.erb (0.0ms) 
    Rendered pages/_rich_excerpt_toolbar.erb (0.5ms) 
    PageItem Load (0.3ms) SELECT "page_items".* FROM "page_items" WHERE "page_items"."page_id" = $1 ORDER BY (case when page_items.ancestry is null then 0 else 1 end), page_items.ancestry, position [["page_id", 55]] 
    Rendered pages/_form.html.erb (5.6ms) 
    Rendered pages/new.html.erb within layouts/application (6.1ms) 
    Rendered shared/_navigation.html.erb (27.0ms) 
    Rendered shared/_notice.html.erb (0.1ms) 
Completed 200 OK in 53ms (Views: 46.6ms | ActiveRecord: 3.4ms) 


Started GET "/pages/new" for 127.0.0.1 at 2014-02-28 22:39:42 +0100 
Processing by PagesController#new as HTML 
    User Load (0.5ms) SELECT "users".* FROM "users" WHERE "users"."auth_token" = '040__V_8SbdLhYxbjd1sYQ' LIMIT 1 
    User Load (0.3ms) SELECT "users".* FROM "users" WHERE "users"."subdomain" = 'ohenrik' LIMIT 1 
    Page Load (0.3ms) SELECT "pages".* FROM "pages" WHERE "pages"."id" IN (3) 
    (0.1ms) BEGIN 
    SQL (0.4ms) INSERT INTO "pages" ("created_at", "status", "title", "updated_at") VALUES ($1, $2, $3, $4) RETURNING "id" [["created_at", Fri, 28 Feb 2014 21:39:42 UTC +00:00], ["status", "draft"], ["title", "Temporary title"], ["updated_at", Fri, 28 Feb 2014 21:39:42 UTC +00:00]] 
    (0.3ms) COMMIT 
    Rendered shared/_form_errors.html.erb (0.1ms) 
    Rendered pages/_rich_link_button.erb (0.0ms) 
    Rendered pages/_rich_content_toolbar.erb (0.6ms) 
    Rendered pages/_rich_link_button.erb (0.0ms) 
    Rendered pages/_rich_excerpt_toolbar.erb (0.4ms) 
    PageItem Load (0.3ms) SELECT "page_items".* FROM "page_items" WHERE "page_items"."page_id" = $1 ORDER BY (case when page_items.ancestry is null then 0 else 1 end), page_items.ancestry, position [["page_id", 56]] 
    Rendered pages/_form.html.erb (4.9ms) 
    Rendered pages/new.html.erb within layouts/application (5.3ms) 
    Rendered shared/_navigation.html.erb (41.1ms) 
    Rendered shared/_notice.html.erb (0.1ms) 
Completed 200 OK in 66ms (Views: 60.5ms | ActiveRecord: 2.6ms)

注意，刪除了一些額外的不必要的代碼，使問題更加清晰。這個問題與jquery已經包含的額外的jquery插件有關。這導致遠程鏈接（也是turbolink）被激發兩次。我的答案波紋管

任何暗示或答案可能是錯誤的讚賞！ :)

來源

2014-02-28 Ole Henrik Skogstrøm

我在這裏沒有看到任何東西會創建兩個記錄。您是否有任何回調，過濾器或其他可能在您執行創建操作時運行的代碼？ –

不，我沒有額外的回調，除了一個驗證。並刪除沒有幫助。 –

但是我現在注意到，如果我手動訪問locallhost：3000/pages/new鏈接，只創建一條記錄，同樣如果我在新選項卡中打開記錄。只有當我按照「新頁面」鏈接發生錯誤。那麼這可能與turbolinks有關？ –

使用find_or_create_*方法而不是create。

def new 
    @page = Page.find_or_create_by_status_and_title("draft","Temporary title") 
end

唯一可能的原因是您的控制器可能會收到兩個不同的請求。可能會出現一些客戶端錯誤，如javascript正在重新載入所有頁面，或者用戶多次單擊該按鈕。您可以檢查日誌並確認。

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