Flutter/Dart/Firestore：如何将地图列表添加到 firebase？

Question

Sorry if this is a repeated question. I have tried searching around but have been unable to find a solution to this problem.

I have a list of maps in dart. For example:

List<Map<String, String>> questionsAndAnswers = [{'questions':'How many?', 'answer':'five'},
{'question':'How much?', 'answer':'five dollars'}];

I would like to store this list of maps into firestore and I have seen that you can manually create an array of maps but I would like to do this programmatically.

Does anyone know how this can be achieved? I've tried _firestore.collection('Quiz').add(questionsAndAnswers); but this hasn't been successful and I'm receiving the following error: The argument type 'List<Map<String, String>>' can't be assigned to the parameter type 'Map<String, dynamic>'.

Answer 1

Say this is your list of map:

List<Map<String, String>> myData = [
  {'questions': 'How many?', 'answer': 'five'},
  {'question': 'How much?', 'answer': 'five dollars'},
];

Adding it to a

• Collection :

   FirebaseFirestore.instance.collection('collection').add({'some_key': myData});

• Document :

   FirebaseFirestore.instance.doc('collection/document').set({'some_key': myData});