apply a a number of examine constraint in gorm with sqlite? – Getting Assist

Mainly I’ve this desk:

sort Desk struct {
  Username `gorm:"column:username;sort:textual content;examine:username>=3;examine:username<=20;distinctive;not null"`
}

My purpose is for Username to fulfill this situation:
username >= 3 && username <= 20

However after I run this:

information := Desk{Username: "aValidUsername"}
err := db.Debug().Mannequin(&information).Save(information).Error

I get this error:
constraint failed: CHECK constraint failed: chk_table_username (275)

Which makes me assume my tag is mistaken. What’s the appropriate approach to do it?

I already discovered the reply::

sort Desk struct {
  Username string `gorm:"column:username;sort:textual content;examine:size(username)>=3;examine:size(username)<=20;distinctive;not null"`
}