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

You can get() the document and use the exists property on the snapshot to check whether the document exists or not.

An example:

final snapShot = await Firestore.instance
  .collection('posts')
  .document(docId)
  .get()

if (snapShot == null || !snapShot.exists) {
  // Document with id == docId doesn't exist.
}