Question

多个数据库表的连接表在下面的代码中不起作用

class City < ActiveRecord::Base
  establish_connection :cities_db
  self.table_name_prefix = "cities_db."
  has_many :clients
end

class Client < ActiveRecord::Base
  # default connection
  belongs_to :city
  self.table_name = "client"

  def self.with_cities
    joins(:city)
  end
end

Client.with_cities # returns ActiveRecord::StatementInvalid: Mysql2::Error: Table 'cities_db.clients' doesn't exist: SELECT `city_db`.`cities`.* FROM `cities_db`.`cities` INNER JOIN `clients` ON `clients`.`city_id` = `cities_db`.`cities`.`id`

Answer 1

根本原因：设置table_name未设置table_name_prefix

Client.with_cities在以下的上下文中运行：cities_db connection。要修复它，请更改Client.rb

self.table_name = "client"

到

self.table_name = "#{self.connection.current_database}.client"

连接多个数据库表的表不起作用

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