使用 :anchor 重定向到。 :anchor 在 Show 操作中丢失，但在 Create 上工作正常

Posted 2023-02-24

【中文标题】使用 :anchor 重定向到。 :anchor 在 Show 操作中丢失，但在 Create 上工作正常

【英文标题】：redirect_to with :anchor. The :anchor gets lost on the Show action but works fine on Create

【发布时间】：2014-10-07 04:27:21

【问题描述】：

在我的 Rails 论坛应用程序中，当在主题中创建新帖子时，它将重定向到 topic_path，并带有页面索引和锚点的附加参数，以便滚动到帖子。像这样：

app/controllers/posts_controller.rb

def create
  @topic = Topic.find(params[:topic_id])
  @post = @topic.posts.build(post_params.merge(user_id: current_user.id))

  if @post.save
    flash[:success] = "Post Created"
    redirect_to topic_path(@topic, :page => @post.page, :anchor => @post.anchor) 
  else
    render 'new'
  end
end

重定向后的url为：http://localhost:3000/topics/1?page=3#post-1364

但是我在 Posts 控制器的 Show 动作中做同样的事情。由于我不想单独显示帖子，因此该操作只需重定向到带有页面索引和帖子锚点的主题。

app/controllers/posts_controller.rb

# Post are not displayed on their own. Showing one will jump to the post inside its topic
def show
  post = Post.find(params[:id])
  redirect_to topic_path(post.topic, :page => post.page, :anchor => post.anchor)
end

但是在帖子调用 show 方法后的 url 不包含锚点。它确实包含页面：http://localhost:3000/topics/1?page=3 我调试了 show 方法，post.anchor 被正确解析。

我的终端输出显示锚由于某种原因丢失了

Started GET "/posts/1364" for 127.0.0.1 at 2014-08-13 10:03:31 -0700
Processing by PostsController#show as html
  Parameters: "id"=>"1364"
  Post Load (0.5ms)  SELECT "posts".* FROM "posts" WHERE "posts"."id" = ? LIMIT 1  [["id", "1364"]]
  Topic Load (0.2ms)  SELECT "topics".* FROM "topics" WHERE "topics"."id" = ? LIMIT 1  [["id", 1]]
  Post Load (1.3ms)  SELECT "posts".* FROM "posts" WHERE "posts"."topic_id" = ?  [["topic_id", 1]]
Redirected to http://localhost:3000/topics/1?page=3#post-1364
Completed 302 Found in 165ms (ActiveRecord: 3.7ms)


Started GET "/topics/1?page=3" for 127.0.0.1 at 2014-08-13 10:03:32 -0700

如果有帮助，这里是我的任何涉及帖子的路线。

    topic_posts GET    /topics/:topic_id/posts(.:format)      posts#index
                POST   /topics/:topic_id/posts(.:format)      posts#create
 new_topic_post GET    /topics/:topic_id/posts/new(.:format)  posts#new
      edit_post GET    /posts/:id/edit(.:format)              posts#edit
           post GET    /posts/:id(.:format)                   posts#show
                PATCH  /posts/:id(.:format)                   posts#update
                PUT    /posts/:id(.:format)                   posts#update
                DELETE /posts/:id(.:format)                   posts#destroy

【参考方案1】：

检查以下问题：

URL Fragment and 302 redirects

Is a 302 Redirect to relative URL valid, or invalid?

  redirect_to topic_path(post.topic, :page => post.page, :anchor => post.anchor, :status => 303) 

应该可以。