的ActiveRecord :: StatementInvalid未知列錯誤

Question

爲什麼這項工作很好：

Tag.create(game_id: 1, tagged: u) 

但這：

tags = Tag.where(game_id: 1, tagged: u).includes(:tagged) 

給出了錯誤：

ActiveRecord::StatementInvalid: Mysql2::Error: Unknown column 'tags.tagged' in 'where clause': SELECT `tags`.* FROM `tags` WHERE `tags`.`game_id` = 1 AND `tags`.`tagged` = 1 

BTW，u是ActiveRecord::Base sublcass。

Tag表結構：

create_table :tags, force: true do |t| 
    t.references :game 
    t.references :tagged_by 
    t.references :tagged 
    t.timestamps 
end 

Answer 1

嘗試做

tags = Tag.includes(:tagged).where(game_id: 1, tagged_id: u.id)