ruby on rails - ActiveRecord::StatementInvalid unknown column error -

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why work fine:

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

but this:

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

gives error:

activerecord::statementinvalid: mysql2::error: unknown column 'tags.tagged' in 'where clause': select `tags`.* `tags`  `tags`.`game_id` = 1 , `tags`.`tagged` = 1

btw, u activerecord::base sublcass.

tag table structure:

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

try doing

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

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