Question

class Program < ActiveRecord::Base
 belongs_to :channel
end


class ProgramSchedule < ActiveRecord::Base
  belongs_to :program
end

Schema.rb

create_table "channels", :force => true do |t|
    t.string   "site"
    t.string   "name"
    t.string   "icon"
    t.string   "type"
    t.string   "country"
    t.integer  "ordertab"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.boolean  "homepage"
  end

  add_index "channels", ["site"], :name => "index_channels_on_site", :unique => true

  create_table "program_schedules", :force => true do |t|
    t.integer  "program_id"
    t.datetime "start"
    t.datetime "stop"
  end

  add_index "program_schedules", ["program_id"], :name => "index_program_schedules_on_program_id"

  create_table "programs", :force => true do |t|
    t.integer  "channel_id"
    t.string   "title"
    t.string   "subtitle"
    t.text     "description"
    t.float    "official_rating"
    t.float    "rating"
    t.string   "type"
    t.integer  "likes"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  add_index "programs", ["channel_id"], :name => "index_programs_on_channel_id"
  add_index "programs", ["title", "channel_id"], :name => "index_programs_on_title_and_channel_id", :unique => true

我必须运行此SQL查询：

  DELETE program_schedules.*
 FROM program_schedules INNER JOIN programs ON program_schedules.pid = programs.id
                        WHERE programs.channel_id = '1'
                        AND (
                               program_schedules.start >= '2011-12-12'
                                AND program_schedules.start <= '2011-12-12'
                           )

Ruby on Rails中的

......

ProgramSchedule.joins(:program).delete_all(
    :start => (dates_array.min)..(dates_array.max),
    :programs => {:channel_id => 1}
    )

错误：（ActiveRecord :: StatementInvalid） /Library/Ruby/Gems/1.8/gems/activerecord-3.1.3/lib/active_record/connection_adapters/mysql2_adapter.rb:283:in`query'：

     Mysql2::Error: Unknown column 'programs.channel_id' in 'where clause':
     DELETE FROM `program_schedules` WHERE `programs`.`channel_id` = 1 AND (`program_schedules`.`start` BETWEEN '2011-12-09 23:00:00' AND
 '2011-12-10 22:20:00')

Answer 1

您的表实际上是programs（带有尾随s）还是program（没有）。因为在您的手写查询中，您引用的是没有's'的表，并且在您的Rails查询中使用...

Answer 2

生成的SQL似乎并没有真正执行连接。尝试重构查询，如下所示：

ProgramSchedule.joins(:program)
               .where(start: (dates_array.min) ..(dates_array.max)
               .where(programs: {channel_id: 1})
               .delete_all

你不必使用2 where子句，我只是这样做是为了让我的连接条件与原始表格中的条件分开。

在连接表中删除记录的问题

2 个答案: