比如某个article表的title标题字段，数据库指定空字符串默认值，Gen 生成 model 的时候，gorm 标签如下：
Title string gorm:"column:title;type:character varying(120);default:''::character varying";comment:标题" json:"title"
这个看起来似乎没有问题，但是实际使用的时候，title 字段如果不赋值，数据库插入的默认值是：::character varying 字符串，并不是预期的空字符串。
我不知道这个算不算 bug，我每次生成 model 之后，都需要把 default:''::character varying 批量替换成 default:'' 才达到预期效果。
请你们有空验证一下，不胜感激。
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Comment From: okki-op
遇到同款bug