Question

我遇到了问题，如果我使用类似查询发布一个空文本字段来搜索记录，它就会开始显示记录：

代码是：

SELECT  "question_options".* FROM "question_options" WHERE 
"question_options"."question_id" = $1 AND (quiz_id = 2 AND lower(option) like 
'%%')  ORDER BY created_at asc LIMIT 1

输出：

SELECT * FROM Clients WHERE Room = '2' AND Color = 'red'

Answer 1

这是SQL LIKE语句的默认行为。如果可以阻止，如下所示。

question_options = if self.answer_text.downcase.present?
  question.question_options.where("quiz_id = ? AND 
  lower(option) like ?", self.quiz_id, "%#{self.answer_text.downcase}%").first
end

Answer 2

在option <> ''中添加where，试试这个

where("quiz_id = ? AND lower(option) like ? AND (option <> '' OR option IS NOT NULL)", self.quiz_id, "%#{self.answer_text.downcase}%").first

希望有所帮助！

如果发布为空，则查询返回记录等Rails

2 个答案: