我正在尝试进行一次Firestore查询，以告诉我值是否唯一（例如用户名）
isUnique但这似乎不起作用？有想法吗？
此问题的一部分可能源于vuelidate，其中 async isUnique(value) {
/** previousVuelidateUsernameCall and
* previousVuelidateUsernameValue are added to
* prevent too many calls. If cache is added to the `get()`
* the first call occurs too soon and the cache is never updated.
*/
if (this.previousVuelidateUsernameCall === value) {
return this.previousVuelidateUsernameValue
}
let results = await db.collection('users')
.where('username', '==', value)
.get() //{source: 'cache'}
.then((snapshot) => {
return snapshot.size === 0
})
this.previousVuelidateUsernameValue = results
this.previousVuelidateUsernameCall = value
return results
}
},
是文本字段上的验证函数。
{{1}}