I'm trying to check if my collection has a document by a function
this is the function:
@override
Future<bool> exist(String uid) async {
final snapShot = await collectionRef.doc(uid).get();
if (snapShot.exists){
return true;
}
return false;
}
the result is: Instance of 'Future',, (neither True nor false)
pointing that my function into Provider
The method is fine, you probably aren't awaiting it when calling it elsewhere.
Also, a slight improvement would be to just return snapShot.exists
instead of the if(exists) return true, else false
.
Since it's a future when you call this method like
bool something = exist("someId");
Will throw an error saying its an instance of future.
But if you await to get a return you should get a bool
bool something = await exist("someId");
To check it in a condition
void checkSomething() async{
if(await exist("someId") == true)
{
}
}
[![enter image description here][1]][1]
when quick fix to code M I got these
[![enter image description here][2]][2]
[1]: https://i.stack.imgur.com/2HpJM.jpg
[2]: https://i.stack.imgur.com/XCpW3.jpg
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.