Need to check if a field value exists inside a Firestore document? Here’s the code for it!

January 14, 2023

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I had a use case where I wanted to validate a code entered against a field inside a Firestore collection document. My goal was to get a true/false response. It’s easy to check if the document exists, but I struggled when trying to find if the value exists inside a specific field…

Enter Custom Actions…

Here’s the custom action code I used, then I just run the custom action with the textinput provided and get a boolean response.

				
					Future<bool> checkIfCodeExists (String CODETOCHECK) async {

  QuerySnapshot querySnapshot = await FirebaseFirestore.instance
      .collection('COLLECTION_NAME')
      .where('CODE FIELD NAME', isEqualTo: CODETOCHECK)
      .limit(1)
      .get();

  return querySnapshot.docs.isEmpty;
}

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