代码之家 › 专栏 › 技术社区 › OKMantis

mysql2::错误:MSQL表为外语的未知列

activerecord ruby-on-rails mysql

OKMantis · 技术社区 · 5 年前

我已经构建了一个Rails应用程序,它连接到一个MySQL数据库,该数据库以西班牙语作为表名和列。我已经制作了用英文名称表示表格的模型,并将其放入每个模型中。 self.table_name = "table_name_in_spanish" 将表转换为模型名,这样就不会破坏Rails约定。考虑到这一点,我有一个模型 Ad 一个模型 AdCopy 其中包含对 广告 模型。当我想为一个广告获得这些描述的列表时,我会在里面做以下操作 rails c :

我首先将AD分配给变量:

pry(main)> ad = Ad.last
  Ad Load (0.4ms)  SELECT  `anuncios`.* FROM `anuncios` ORDER BY `anuncios`.`id` DESC LIMIT 1
=> #<Ad:0x00007ff8dc45e2f0
 id: 1241,
 empresa: "Example Ad",
 tel: "555 555 555",
 [...]

然后尝试访问广告副本(描述属于广告):

pry(main)> ad.ad_copies
  AdCopy Load (1.5ms)  SELECT `anuncios_textos`.* FROM `anuncios_textos` WHERE `anuncios_textos`.`ad_id` = 1241
  AdCopy Load (1.3ms)  SELECT  `anuncios_textos`.* FROM `anuncios_textos` WHERE `anuncios_textos`.`ad_id` = 1241 LIMIT 11
=> #<AdCopy::ActiveRecord_Associations_CollectionProxy:0x3ffc6d8fc498>

我在这里的东西已经让我困惑了,因为我不知道 ActiveRecord_Associations_CollectionProxy 是。

因此,最后一步是尝试获取要显示的第一个描述:

pry(main)> ad.ad_copies.first
  AdCopy Load (1.3ms)  SELECT  `anuncios_textos`.* FROM `anuncios_textos` WHERE `anuncios_textos`.`ad_id` = 1241 ORDER BY `anuncios_textos`.`id_anuncio` ASC LIMIT 1
ActiveRecord::StatementInvalid: Mysql2::Error: Unknown column 'anuncios_textos.ad_id' in 'where clause': SELECT  `anuncios_textos`.* FROM `anuncios_textos` WHERE `anuncios_textos`.`ad_id` = 1241 ORDER BY `anuncios_textos`.`id_anuncio` ASC LIMIT 1
from /Users/okmantis/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/mysql2-0.4.10/lib/mysql2/client.rb:120:in `_query'

问题就在这里。我如何能够访问属于我的广告的描述?

以下是我的模型:

class Ad < ApplicationRecord
  self.table_name = "anuncios"
  has_many :ad_copies
  has_many :ad_addresses
  has_many :relationships, foreign_key: 'id_anuncio'
  has_many :magazines
  has_many :categories, through: :relationships
  belongs_to :user
end

class AdCopy < ApplicationRecord
  self.table_name = "anuncios_textos"
  self.primary_key = "id_anuncio"
  belongs_to :ad, foreign_key: "id_anuncio", optional: true
  belongs_to :language, foreign_key: "id_idioma", optional: true
end

模型ad的模式表(西班牙语:anuncios):

create_table "anuncios", id: :integer, options: "ENGINE=MyISAM DEFAULT CHARSET=utf8", force: :cascade do |t|
    t.string "empresa", null: false
    t.string "tel", null: false
    t.string "fax_principal", null: false
    t.string "movil_principal", null: false
    t.string "email_principal", null: false
    t.string "web", null: false
    t.string "facebook", null: false
    t.string "horario_v_principal", null: false
    t.string "horario_i_principal", null: false
    t.string "direccion_principal", null: false
    t.string "poblacion_principal", null: false
    t.string "activo", limit: 2, null: false
    t.string "tam_anuncio", null: false
    t.string "twitter", null: false
    t.string "link", limit: 2, null: false
    t.string "general", limit: 2, null: false
    t.string "isla", limit: 10, null: false
    t.string "subtitulo", null: false
    t.string "comentario", null: false
    t.datetime "modificacion", null: false
    t.integer "promo1", default: 0, null: false
    t.integer "promo2", default: 0, null: false
    t.string "instagram", null: false
    t.string "tel2", null: false
    t.string "tel3", null: false
    t.string "tel4", null: false
    t.string "movil2", null: false
    t.string "movil3", null: false
    t.string "movil4", null: false
  end

模型adcopy的模式表(西班牙语:anuncios-textos):

create_table "anuncios_textos", primary_key: ["id_anuncio", "id_idioma"], options: "ENGINE=MyISAM DEFAULT CHARSET=utf8", force: :cascade do |t|
    t.integer "id_anuncio", null: false
    t.integer "id_idioma", null: false
    t.text "descripcion", null: false
  end

1 回复 | 直到 5 年前

OKMantis 5 年前

我找到了答案。我忘了将广告模型中的外键设置为“id_anuncio”。如果您没有明确地告诉Rails外键列的名称不同,那么它只会通过模型名称+ID来调用它: ad_id . 您可以在控制台内部的错误中看到这一点: WHERE anuncios_textos.ad_id .

因此,我的广告模式必须具备以下条件:

class Ad < ApplicationRecord
  self.table_name = "anuncios"
  has_many :ad_copies, foreign_key: 'id_anuncio'
  [...]
end