Mysql2 ::错误：操作数应包含1列

Question

我的控制器中的这一行：

@feedback = Feedback.where("reviewer_id = ?, reviewee_id = ?, strength_id = ?", current_user.id, @report_for.id, @context ).first

当我尝试显示@feedback.something：

时，

会产生此错误

Mysql2::Error: Operand should contain 1 column(s): SELECT  `feedbacks`.* FROM `feedbacks` WHERE (reviewer_id = 1, reviewee_id = 10, strength_id = 0) LIMIT 1

Answer 1

我认为你的SQL错了，试试这个

@feedback = Feedback.where("reviewer_id = ? and reviewee_id = ? and strength_id = ?", current_user.id, @report_for.id, @context ).first