加入了多個數據庫表的表不起作用

Question

請參見下面

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` 

代碼是否有可能以某種方式解決這個問題？感謝您的提前！

Answer 1

根源：設置TABLE_NAME不設置table_name_prefix

Client.with_cities在的上下文中運行：cities_db連接。要修復它改變Client.rb

self.table_name = "client" 

到

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