check if Document exist in a collection failed-CodePudding

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

CodePudding user response：

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.

CodePudding user response：

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