Flutter firestore - Check if document ID already exists

Question

I want to add data into the firestore database if the document ID doesn\'t already exists. What I\'ve tried so far:

// varuId == the ID that is set to the do         


        

Answer 1

Use the exists method on the snapshot:

final snapShot = await Firestore.instance.collection('posts').document("docID").get();

   if (snapShot.exists){
        //it exists
   }
   else{
        //not exists 
   }