错误：缺少FROM子句条目表＆QUOT;自＆QUOT; （轨道4活动记录的事务时，PostgreSQL 9.4）） [英] ERROR: missing FROM-clause entry for table "self" (Rails 4 Active Record transaction, postgresql 9.4))

问题描述

在创建模型新政，我用一个after_create创建的DealPrize表奖。

新政和DealPrize有一个属于/的has_many关系：一锤子有很多新政的奖品和Dealprize属于新政

。

它的工作原理是这样的：内幕交易，我有一列'奖号码'，我用一个after_create使evetytime的amdin创建一个新的协议，应用程序借此prize_number列，创建奖品此卷（插入尽可能多的行作为必要）DealPrize表里面。

我无法用我的Rails应用MOEL变量PostgreSQL的查询中。

下面是一个工作查询（用数字代替变量）。它perfetcly在我的数据库写入吧。

模型deals.rb

  CONNEXION =的ActiveRecord :: Base.connection来

    高清create_prizes
      Deal.transaction做
        self.120000.times做|我|
          CONNEXION.executeINSERT INTO deal_prizes（deal_id，created_at，的updated_at）
          值（62，'2009-01-23 20点21分13秒，20点21分13秒2009-01-23'）
        结束
      结束
    结束
 

但是，当我更换示例值的不同而变化，因为它应该是，我得到一个错误。

  CONNEXION =的ActiveRecord :: Base.connection来

    高清create_prizes
      Deal.transaction做
        self.120000.times做|我|
          CONNEXION.executeINSERT INTO deal_prizes（deal_id，created_at，的updated_at）
          值（self.id，'2009-01-23 20时21分13秒，20时21分13秒2009-01-23'）
        结束
      结束
    结束
 

如果我用self.if，我得到错误

 错误：缺少FROM子句条目表自我
 

我也尝试self.id，ID，deal.id，deal_id，self_id，没有任何工程。

感谢您的帮助，

编辑 - 添加了dimakura

在优化与原始的SQL和交易：

 高清create_prizes
      self.1200000.times做
        奖品= DealPrize.create（：deal_id =＆GT; self.id，：admin_user_id =＆GT; self.admin_user_id）
        prizes.save
      结束
    结束
 

最新code的帮助下dimakura

  CONNEXION =的ActiveRecord :: Base.connection来

高清create_prizes
  Deal.transaction做
    self.1200000.times做|我|
      ST = CONNEXION.raw_connection。prepare（INSERT INTO deal_prizes（deal_id，created_at，的updated_at）值（？，？，？））
      st.execute（self.id，Time.now，Time.now）
      st.close
    结束
  结束
结束
 

获取错误：

 错误的参数号（1为2..3）
 

解决方案

它应该是：

  CONNEXION.executeINSERT INTO deal_prizes（deal_id，created_at，的updated_at）
值（＃{self.id}，'2009-01-23 20时21分13秒，20时21分13秒2009-01-23'）
 

但它不是一个推荐的方法。你不应该插参数，是这样的。

更好的方法是：

  ST = CONNEXION.raw_connection。prepare（INSERT INTO deal_prizes（deal_id，created_at，的updated_at）值（？，？，？））
st.execute（self.id，Time.now，Time.now）
st.close
 

When creating a model Deal, I use an after_create to create prizes on the DealPrize table.

Deal and DealPrize have a belong to/has_many relations: a Deal has many Deal prizes and a Dealprize belongs to a Deal.

It works like this: inside Deal, I have a column 'prize-number' and I use an after_create so that evetytime the amdin creates a new deal, the app takes this prize_number column, and create this volume of prizes (inserting as many rows as necessary) inside the DealPrize table.

I fail to use my Rails app moel variable inside a postgresql query.

Here is a working query (using figures instead of variables). It perfetcly writes it on my database.

model deals.rb

CONNEXION = ActiveRecord::Base.connection

    def create_prizes
      Deal.transaction do        
        self.120000.times do |i|
          CONNEXION.execute "INSERT INTO deal_prizes (deal_id, created_at, updated_at) 
          values ( 62, '2009-01-23 20:21:13', '2009-01-23 20:21:13')"
        end
      end
    end

But when I replace the example values by variables as it should be, I get an error.

CONNEXION = ActiveRecord::Base.connection

    def create_prizes
      Deal.transaction do        
        self.120000.times do |i|
          CONNEXION.execute "INSERT INTO deal_prizes (deal_id, created_at, updated_at)
          values ( self.id, '2009-01-23 20:21:13', '2009-01-23 20:21:13')"
        end
      end
    end

If I use self.if, I get error

ERROR: missing FROM-clause entry for table "self"

I tried also self.id, id, deal.id, deal_id, self_id, nothing works.

thanks for your help,

EDIT - ADDED for dimakura

Before optimizing with raw sql and transactions:

def create_prizes
      self.1200000.times do
        prizes = DealPrize.create(:deal_id => self.id, :admin_user_id => self.admin_user_id)
        prizes.save
      end
    end

LATEST CODE with the help of dimakura

CONNEXION = ActiveRecord::Base.connection

def create_prizes
  Deal.transaction do  
    self.1200000.times do |i| 
      st = CONNEXION.raw_connection.prepare("INSERT INTO deal_prizes (deal_id, created_at, updated_at) values (?, ?, ?)")
      st.execute(self.id, Time.now, Time.now)
      st.close
    end
  end
end

Getting error:

wrong number of arguments (1 for 2..3)

解决方案

It should be:

CONNEXION.execute "INSERT INTO deal_prizes (deal_id, created_at, updated_at)
values ( #{self.id}, '2009-01-23 20:21:13', '2009-01-23 20:21:13')"

But it's not a recommended approach. You should never interpolate parameters like this.

The better approach is:

st = CONNEXION.raw_connection.prepare("INSERT INTO deal_prizes (deal_id, created_at, updated_at) values (?, ?, ?)")
st.execute(self.id, Time.now, Time.now)
st.close

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