将字符串转换为where

Question

我有以下where子句：

OnlineCourseRegistration.where(course_class_id: 6, status: "Completed")
=> #<OnlineCourseRegistration id: 142, cart_id: 150, user_id: 7069, course_class_id: 681, created_at: "2017-07-15 22:06:06", updated_at: "2017-07-20 23:59:01", exam_attempts: 1, exam_completed_at: "2017-07-20 23:57:32", evaluation_completed_at: "2017-07-20 23:59:01", status: "Completed", score: "87", add_extension: false, retest_cart_id: nil, retest_purchased_at: nil>

我还想补充一点，得分将大于70，所以像......

OnlineCourseRegistration.where(course_class_id: 681, status: "Completed", :score.to_i > 70).last

...但当然，这不起作用。有没有办法在where子句中执行此操作？

Answer 1

ActiveRecord，其中string作为查询构造函数

OnlineCourseRegistration.where("course_class_id = ? AND status = ? AND score > ?", 681, "Completed", 70).last

Answer 2

如果您不想使用原始SQL，可以使用Arel方法，例如：

OnlineCourseRegistration.where(course_class_id: 681, status: "Completed").where(OnlineCourseRegistration.arel_table[:score].gt(70)).last

Answer 3

对于后人，我想添加这些cast solutions作为答案：

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