为什么我收到 ArgumentError（错误数量的参数（给定 0，预期为 1）进行销毁操作？Rails 5.2

Question

我有一个自定义销毁操作的链接，该操作通过 AJAX 调用删除记录。问题是，当我单击 link_to 按钮时。我收到 ArgumentError（错误数量的参数（给定 0，预期为 1））：通常，它可以正常工作。但是，我无法识别错误的原因是什么。我正在搜索的记录与范围内的当前对象相关联。在给定参数的情况下，如何使用取消共享操作成功销毁记录？

我尝试更改操作的参数以查找有问题的记录并删除对象。只有一种方法有效，那就是使用 where() 子句，它允许我找到具有 original_post id 和 current_user.id 的对象。最后，我创建了一个与操作相关的 unshare.js.erb。

_post.html.erb

<%= link_to unshare_post_path(post), method: :delete, remote: true, style: 'text-decoration: none;' do %>
   <i class="fas fa-share-square fa-2x post-charm-bar-icon-color"></i>
<% end %>

unshare.js.erb

$('#share_<%= @post.id %>').html('<%= escape_javascript(render :partial => "posts/share", :locals => {:post => @post}) %>');
$("#share_<%= @post.id %>").fadeOut("slow", function () {
$(this).remove();
});

posts_controller.rb

 def unshare
    post = Post.where(original_post_id: @post.id).where(user_id: current_user.id)
    respond_to do |format|
      if post.destroy
        format.html { redirect_to posts_path, notice: "You've successfully unshared the Post" }
        format.js
      end
    end
  end

routes.rb

resources :posts, on: :collection do
    member do
      post :share
      delete :unshare
    end
  end

预期结果：当您点击取消分享时，销毁操作成功启动，帖子消失。

实际结果：我收到一条错误消息，指出销毁操作需要 1 个参数，但在 'block in unshare' 中给出了 0。

Started DELETE "/posts/472epAQhoQfg/unshare" for 127.0.0.1 at 2019-02-09 19:22:02 -0500
Processing by PostsController#unshare as JS
  Parameters: {"on"=>:collection, "id"=>"472epAQhoQfg"}
  User Load (1.0ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 
ORDER BY "users"."id" ASC LIMIT $2  [["id", 2], ["LIMIT", 1]]
  Post Load (1.0ms)  SELECT  "posts".* FROM "posts" WHERE "posts"."hash_id" = $1 LIMIT $2  [["hash_id", "472epAQhoQfg"], ["LIMIT", 1]]
Completed 500 Internal Server Error in 10ms (ActiveRecord: 2.0ms)



ArgumentError (wrong number of arguments (given 0, expected 1)):

app/controllers/posts_controller.rb:70:in `block in unshare'
app/controllers/posts_controller.rb:69:in `unshare'

更新服务器日志

Started GET "/new_notification_check.json" for 127.0.0.1 at 2019-02-09 20:40:12 -0500
Started DELETE "/posts/472epAQhoQfg/unshare" for 127.0.0.1 at 2019-02-09 20:40:13 -0500
Processing by NotificationsController#check_for_new_notifications as JSON
Processing by PostsController#unshare as JS
  Parameters: {"on"=>:collection, "id"=>"472epAQhoQfg"}
  User Load (3.0ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 
ORDER BY "users"."id" ASC LIMIT $2  [["id", 2], ["LIMIT", 1]]
  User Load (3.0ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 
ORDER BY "users"."id" ASC LIMIT $2  [["id", 2], ["LIMIT", 1]]
  Notification Load (2.0ms)  SELECT "notifications".* FROM "notifications" 
WHERE "notifications"."recipient_id" = $1 AND "notifications"."read_at" IS NULL  [["recipient_id", 2]]
Completed 200 OK in 10ms (Views: 1.8ms | ActiveRecord: 5.0ms)


  Post Load (7.0ms)  SELECT  "posts".* FROM "posts" WHERE "posts"."hash_id" = $1 LIMIT $2  [["hash_id", "472epAQhoQfg"], ["LIMIT", 1]]
  Post Load (1.0ms)  SELECT  "posts".* FROM "posts" WHERE "posts"."original_post_id" IS NULL AND "posts"."user_id" = $1 LIMIT $2  [["user_id", 2], ["LIMIT", 1]]
   (1.0ms)  BEGIN
  Impression Destroy (493.9ms)  DELETE FROM "impressions" WHERE "impressions"."impressionable_id" = $1 AND "impressions"."impressionable_type" = $2  [["impressionable_id", 1], ["impressionable_type", "Post"]]
  ActsAsVotable::Vote Load (4.0ms)  SELECT "votes".* FROM "votes" WHERE "votes"."votable_id" = $1 AND "votes"."votable_type" = $2  [["votable_id", 1], ["votable_type", "Post"]]
  Comment Load (3.0ms)  SELECT "comments".* FROM "comments" WHERE "comments"."commentable_id" = $1 AND "comments"."commentable_type" = $2 AND "comments"."parent_id" IS NULL  [["commentable_id", 1], ["commentable_type", "Post"]]
  Comment Load (0.0ms)  SELECT "comments".* FROM "comments" WHERE "comments"."post_id" = $1  [["post_id", 1]]
  Post Destroy (1.0ms)  DELETE FROM "posts" WHERE "posts"."id" = $1  [["id", 1]]
   (38.0ms)  COMMIT
Redirected to http://127.0.0.1:3000/posts
Completed 302 Found in 701ms (ActiveRecord: 554.9ms)


Started DELETE "/posts" for 127.0.0.1 at 2019-02-09 20:40:16 -0500

ActionController::RoutingError (No route matches [DELETE] "/posts"):

更新 2

posts_controller/share 操作

def share
    post = current_user.posts.new(original_post_id: @post.id)
    if post.save
      respond_to do |format|
        format.html {redirect_to :back}
        format.js {render action: 'share'}
      end
    end
 end

share.js.erb

$('#share_<%= @post.id %>').html('<%= escape_javascript(render :partial => "posts/share", :locals => {:post => @post}) %>');

Answer 1

Post.where 返回记录集合，这意味着post 变量包含多条记录。

您必须对每个帖子实例调用post.delete_all 或#destroy 方法，例如：post.each {|p| p.destroy }

但是要修复你的代码，它应该是

  def unshare
    post = Post.find_by(original_post_id: @post.original_post_id, user_id: current_user.id)
    if post.blank?
      respond_to do |format|
        if post.destroy
          format.html { redirect_to :back, notice: "Post is not found" }
        end
      end
      return
    end
    respond_to do |format|
      if post.destroy
        format.html { redirect_to posts_path, notice: "You've successfully unshared the Post" }
        format.js
      end
    end
  end