Rails 4.在ActiveAdmin中更新模型时出现Stack level too deep错误

Question

我的问题如下：当我尝试在 ActiveAdmin 面板中更新模型 (comment.rb) 时，出现 Stack level too deep 错误。

更新任何其他模型在 ActiveAdmin 面板中工作正常，当我删除或创建新评论时，也没有错误。

因此，我尝试使用以下命令通过 rails console 更新我在数据库中的评论记录：Comment.first.update_column :body, 'hello' 它工作正常，但每次我尝试更新 ActiveAdmin 面板中的记录时，我得到这个无限递归，老实说，我什至不知道是什么原因造成的。

以下是我在 ActiveAdmin 面板中单击 'update' 按钮时出现的错误堆栈跟踪部分：

Started PATCH "/admin/product_comments/2" for 127.0.0.1 at 2015-08-18 15:24:38 +0300
Processing by Admin::ProductCommentsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"AhytIgM3DisFl4QZJaPL2JxFOC/3wKOawpeg6TT/GK3OyVUeotZ4whiQydKe/Jf4vLTsbrGicuiIr3ZfuQUC3Q==", "comment"=>{"user_id"=>"801", "product_id"=>"817", "body"=>"hello world!"}, "commit"=>"Update Comment", "id"=>"2"}
  AdminUser Load (0.2ms)  SELECT  "admin_users".* FROM "admin_users" WHERE "admin_users"."id" =   ORDER BY "admin_users"."id" ASC LIMIT 1  [["id", 1]]
  Comment Load (0.2ms)  SELECT  "comments".* FROM "comments" WHERE "comments"."id" =  LIMIT 1  [["id", 2]]
   (0.1ms)  BEGIN
  User Load (0.2ms)  SELECT  "users".* FROM "users" WHERE "users"."id" =  LIMIT 1  [["id", 801]]
  User Exists (0.3ms)  SELECT  1 AS one FROM "users" WHERE ("users"."email" = 'user801@example.com' AND "users"."id" != 801) LIMIT 1
  Product Load (0.1ms)  SELECT  "products".* FROM "products" WHERE "products"."id" =  LIMIT 1  [["id", 817]]
  Comment Load (0.1ms)  SELECT "comments".* FROM "comments" WHERE "comments"."product_id" =   [["product_id", 817]]
  CACHE (0.0ms)  SELECT  "users".* FROM "users" WHERE "users"."id" =  LIMIT 1  [["id", 801]]
  User Exists (0.3ms)  SELECT  1 AS one FROM "users" WHERE ("users"."email" = 'user801@example.com' AND "users"."id" != 801) LIMIT 1
  User Exists (0.2ms)  SELECT  1 AS one FROM "users" WHERE ("users"."email" = 'user801@example.com' AND "users"."id" != 801) LIMIT 1

然后 User Exists 行重复了数十亿次。

当 User Exists 行结束时，还有另一段堆栈跟踪：

   (0.1ms)  ROLLBACK
Completed 500 Internal Server Error in 198ms (ActiveRecord: 33.7ms)

SystemStackError - stack level too deep:
  activerecord (4.2.3) lib/active_record/connection_adapters/postgresql/utils.rb:72:in `new'
  activerecord (4.2.3) lib/active_record/connection_adapters/postgresql/utils.rb:72:in `extract_schema_qualified_name'
  activerecord (4.2.3) lib/active_record/connection_adapters/postgresql/quoting.rb:31:in `quote_table_name'
  arel (6.0.2) lib/arel/visitors/to_sql.rb:770:in `quote_table_name'
  arel (6.0.2) lib/arel/visitors/to_sql.rb:705:in `visit_Arel_Attributes_Attribute'
  arel (6.0.2) lib/arel/visitors/reduce.rb:13:in `visit'
  arel (6.0.2) lib/arel/visitors/to_sql.rb:669:in `visit_Arel_Nodes_Equality'
  arel (6.0.2) lib/arel/visitors/reduce.rb:13:in `visit'

它也有大约十亿行长。

这是我的 Comment 模型的样子：

class Comment < ActiveRecord::Base
  belongs_to :user
  belongs_to :product

  validates :body, presence: true, length: { maximum: 500 }
  validates :user_id, :product_id, presence: true, numericality:
            { greater_than: 0, only_integer: true }
  validates_associated :user, :product

  # Method for displaying comment's id, user's full
  # name and product name in AdminPanel. ActiveAdmin
  # uses the `display_name` method in models for its
  # drop-down inputs.
  def display_name
    id.to_s + '. From: ' + user.first_name + ' ' +
      user.last_name + '. On: ' + product.name
  end
end

在 admin/comment.rb 我有以下内容：

ActiveAdmin.register Comment, as: "ProductComment" do
  # Yep, that's a lot of params, but I thought adding them would help :) 
  permit_params :id, :user_id, :product_id, :body, :user, :product

  index do
    selectable_column
    id_column
    column :user
    column :product
    column :body
    actions
  end

  filter :user
  filter :product
  filter :created_at

  form do |f|
    f.inputs "Edit Product Comment" do
      f.input :user
      f.input :product
      f.input :body
    end
    f.actions
  end
end

你能帮我弄清楚这里发生了什么以及如何解决这个问题吗？

PS：如果我没有提供足够的信息，这里有一些来自我的 repository:

的链接

Answer 1

validates_associated表示您在保存评论记录的同时也在验证用户记录。

您对用户记录进行了验证，您在其中指定电子邮件必须是唯一的，但该验证（或用户记录中的某些其他验证）存在缺陷...作为验证的一部分，您尝试保存用户记录，但在保存用户记录时调用验证，并且作为验证的一部分，您尝试保存用户记录...不会结束（直到您运行出栈）。

因此请检查您的用户验证。为了证明这是问题所在，您可以暂时删除 validates_associated

Rails 4.在ActiveAdmin中更新模型时出现Stack level too deep错误

Rails 4. Stack level too deep error when updating model in ActiveAdmin

activeadmin

ruby-on-rails-4