Mongoid和ActiveRecord的关系：未定义的方法`quoted_table_name“ [英] Mongoid and ActiveRecord relations: undefined method `quoted_table_name'

问题描述

 类竞赛＆LT;的ActiveRecord :: Base的
  HAS_ONE：claim_template
结束

类ClaimTemplate
  包括Mongoid ::文档
  belongs_to的：大赛
结束

＃ 安慰
Contest.new.claim_template
＃=＆GT; NoMethodError：未定义的方法`quoted_table_name'的ClaimTemplate：类
 

好了，让我们添加 quoted_table_name 到 ClaimTemplate ：

 高清self.quoted_table_name
  claim_templates
结束

＃ 安慰
Contest.new.claim_template
＃=＆GT;零
＃ 凉！
＃ 但：
Contest.last.claim_template
＃=＆GT;类型错误：无法转换符号转换成String
 

那么，如何能配置我的模型与对方正常工作

PS：的

现在我有这样的结构，它工作得很好，但我想有关系的好处（ Assosiations ）。

 类竞赛＆LT;的ActiveRecord :: Base的
  ＃HAS_ONE：claim_temlate
  高清claim_template
    ClaimTemplate.where（：contest_id =＆GT; self.id）。首先
  结束

  ＃Mongoid将是疯了没有这个黑客
  高清self.using_object_ids？
    假
  结束
结束
 

解决方案

我不知道这是否已经正式尚未实施。协会通过的ActiveRecord ::反射，这是很难coded到关系表的想法来处理居多，看到这个类：

• 的https://github.com/rails/rails/blob/master/activerecord/lib/active_record/reflection.rb

什么这表明的是，有没有办法ActiveRecord关联可以像Mongoid工作。

我建议，要么建立一个创业板来解决这个问题，通过建立一个类似的反映包装Mongoid，或者只是手动构建相关联的对象。

class Contest < ActiveRecord::Base
  has_one :claim_template
end

class ClaimTemplate
  include Mongoid::Document
  belongs_to :contest
end

# console
Contest.new.claim_template
#=> NoMethodError: undefined method `quoted_table_name' for ClaimTemplate:Class

ok, let's add quoted_table_name to ClaimTemplate:

def self.quoted_table_name
  "claim_templates"
end

# console
Contest.new.claim_template
#=> nil
# Cool!
# But:
Contest.last.claim_template
#=> TypeError: can't convert Symbol into String

So how can I configure my models to work properly with each other

PS:

Now I have this construction, which works fine, but I want to have benefits of Relations (Assosiations).

class Contest < ActiveRecord::Base
  # has_one :claim_temlate
  def claim_template
    ClaimTemplate.where(:contest_id => self.id).first
  end

  # Mongoid going to be crazy without this hack
  def self.using_object_ids?
    false
  end
end

解决方案

I am not sure if this has been formally implemented yet. Associations are handled mostly through ActiveRecord::Reflection, which is hardcoded to the idea of relational tables, see this class:

• https://github.com/rails/rails/blob/master/activerecord/lib/active_record/reflection.rb

What that's suggesting is that there is no way ActiveRecord associations can work with things like Mongoid.

I recommend either building a gem to solve that problem by building a similar reflection wrapper for Mongoid, or just construct the associated objects manually.

这篇关于Mongoid和ActiveRecord的关系：未定义的方法`quoted_table_name“的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！