Question

我有一个PagesController，我正在创建一个这样的新记录：

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

我正在使用Page.create因为用户应该能够立即add page_items到新页面，并且关联需要带有ID的记录。

问题在于，每当我点击“新记录”时，我都会创建两条新记录。不只是一个。

修改：此问题似乎与Turbolinks有关。如果我使用普通的“新页面”链接，则会向服务器发出两个请求，因此会创建两个页面。如果我手动访问链接或在新选项卡中打开链接，我会得到一条记录。

这个问题贯穿整个应用。所有链接都会向服务器创建两个get请求。

编辑2：这是我点击“新页面”链接时的服务器响应：

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，删除了一些额外不必要的代码以使问题更清晰。问题与一个已包含jquery的额外jquery插件有关。这导致远程链接（也是turbolink）被解雇两次。我的回答如下：

对可能出错的任何提示或答案表示赞赏！：）

Answer 1

使用find_or_create_*方法代替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会收到两个不同的请求。可能存在一些客户端错误，例如javascript正在重新加载所有页面，或者用户多次单击该按钮。您可以检查日志并确认。

Rails turbolink请求提交两次

1 个答案: