How to add data to the array of hash map in the document using Firestore?

Question

I want to add data to the existing array without overwriting. And inside each document, I have an array of HashMap. I am trying to add data to the existing one. Kindly check the below code and shed some light.

   public void createNewCase(){
     Map<String, String> caseInfo = new HashMap<String, String>();


    caseInfo.put("chief_complaint", chiefComplaintET.getText().toString());
        caseInfo.put("facility", facilityET.getText().toString());
        caseInfo.put("location", locationET.getText().toString());
        caseInfo.put("assigned_provider", assignProviderET.getText().toString());
        caseInfo.put("referring_provider", referringProviderET.getText().toString());
        caseInfo.put("admit_date", adminDateET.getText().toString());
        caseDictionary.add(caseInfo);
        final String patientID = sharedPrefHelper.getStr("patient_id");



        db.collection("patients").whereEqualTo("patient_id", patientID).get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
            private static final String TAG = "New Case Creation" ;

            @Override
            public void onComplete(@NonNull Task<QuerySnapshot> task) {
                if (task.isSuccessful()) {
                    List<HashMap<String,String>> list = new ArrayList<>();
                    for (QueryDocumentSnapshot document : task.getResult()) {
                        patient patient = new patient();
                        list = (List) document.get("patient_case");
                        for (HashMap<String, String> item:list) {
                            caseDictionary.add(item);
                        }
                    }
                    System.out.println(caseDictionary);
                    HashMap<String, Object> uploadData = new HashMap<>();
                    uploadData.put("patient_case", caseDictionary);
                    DocumentReference caseRef = db.collection("patients").document(patientID); // am stuck here

                }else{
                    Log.w(TAG, "Error getting documents.", task.getException());
                    Toast.makeText(NewCase.this, "Something bad happened", Toast.LENGTH_SHORT).show();
                    Helper.m_Dialog.hide();
                }

            }
        });

}

Edit 1 Below code deleting old data and adding new data. I need to append.

   final String patientID = sharedPrefHelper.getStr("patient_id");
        final CollectionReference collectionReference = db.collection("patients");
    collectionReference.whereEqualTo("patient_id", patientID).get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
        @Override
        public void onComplete(@NonNull Task<QuerySnapshot> task) {
            Toast.makeText(NewCase.this, task.getResult().toString(), Toast.LENGTH_SHORT).show();
            if (task.isSuccessful()) {
                for (QueryDocumentSnapshot document : task.getResult()) {

                    Map<Object, Object> map = new HashMap<>();
                    map.put("patient_case", caseInfo);

                    collectionReference.document(document.getId()).set(map, SetOptions.merge());
                }
            }else{
                Toast.makeText(NewCase.this, task.getResult().toString(), Toast.LENGTH_SHORT).show();
            }
        }
    });

Please add your database structure as a screenshot.

Alex Mamo
– Alex Mamo

2019-08-27 14:48:22 +00:00
Commented Aug 27, 2019 at 14:48 — Alex Mamo
– Alex Mamo, Commented Aug 27, 2019 at 14:48
@AlexMamo added.

Mac_Play
– Mac_Play

2019-08-27 14:51:32 +00:00
Commented Aug 27, 2019 at 14:51 — Mac_Play
– Mac_Play, Commented Aug 27, 2019 at 14:51

Alex Mamo · Accepted Answer · 2019-08-27 15:13:31Z

1

As I see in your screenshot, in your patients collection you have documents that contain an array that holds maps (objects). In order to be able to update those maps that exist within your array you should create a Map object that corresponde to your exact document structure and use DocumentReference's set(Object data, SetOptions options) method for that. So pass as the first argument the map and as the second argument SetOptions.merge(). You can find a simpler example in my answer from the following post:

Firestore firebase Android search and update query

answered Aug 27, 2019 at 15:13

Alex Mamo

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11 Comments

Mac_Play Over a year ago

I was on vacation. I am going to try today and will update you. For more clarity, let me tell you my scenario again, am having an array of hash maps, every time when I add data, it should append to array of hash maps. Can you please edit my code?

Alex Mamo Over a year ago

Yes, an arrays of hash maps, it's correct. Ok, give it a try and tell me if it works.

Mac_Play Over a year ago

Ok. where to mention the patient_case field?

Alex Mamo Over a year ago

If you started to make your own attempt for solving this issue using the information provided in my answer, please consider ask another question if something else comes up. I cannot guide at every step in your development.

Mac_Play Over a year ago

Done @Alex Mamo

|

markand chauhan · Accepted Answer · 2020-11-03 05:30:32Z

This is one of my example

i have done it like this

 List<Map> history = List();  

 History historyObj = History(typee, name, timeStamp, pointsBefore, points, itemPoints);  

 history.add(historyObj.toMap());  

 //Firesore collection object  

 CollectionReference child = _firestore.collection('children');  

 //Firesore document object  

 DocumentReference docRef = child.doc(selectedChild.childId);  

 // "history" is your "patient_case"  

 docRef.update({"history": FieldValue.arrayUnion(history)}).then(
     (value) => print("Update done"));

History is one of my class

History class includes method toMap() which converts all history class variables and its values to 'Key' : 'value' form like this

Map<String, dynamic> toMap() => {  
     "type": type,
     "name": name,
     "timestamp": timestamp,
     "points_before": points_before,
     "points_after": points_after,
     "points_affected": points_affected,
   };

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