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Aug 18th, 2019
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  1. HashMap<String, ArrayList<GenericTagModel>> myObject = new HashMap<>();
  2. ArrayList<GenericTagModel> toArrayList = new ArrayList<GenericTagModel>(usedModels);
  3. myObject.put("tags",toArrayList);
  4. db.collection("users").document(user.getUid()).set(myObject, SetOptions.merge());
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