/**
     * Method to read the Grade List from the database
     */

    private void readGrades() {
        managerAdminApi.grade(new Callback<String>() {
            @Override
            public void onResponse(@NonNull Call<String> call, @NonNull Response<String> response) {
                Log.i("Response String:", response.body().toString());
                if (response.isSuccessful()) {
                    Log.i("onSuccess: ", response.body().toString());
                    String jsonresponse = response.body().toString();
                    displayGrades(jsonresponse);
                } else {
                    Log.i("onEmptyResponse: ", "Returned Empty Response");
                    Toast.makeText(getContext(),"Nothing returned", Toast.LENGTH_LONG).show();

                }

            }

            @Override
            public void onFailure(Call<String> call, Throwable t) {

            }
        });
    }

    private void displayGrades(String response){
        try {
            JSONObject obj = new JSONObject(response);
            if(obj.optString("success").equals("true")) {
                gradeList = new ArrayList<>();
                JSONArray dataArray = obj.getJSONArray("data");
                for (int i=0; i < dataArray.length(); i++) {
                    ObjectGrade gradeSpinner = new ObjectGrade();
                    JSONObject dataObj = dataArray.getJSONObject(i);
                    gradeSpinner.setId(dataObj.getInt("id"));
                    gradeSpinner.setGrade(dataObj.getString("grade"));
                    gradeList.add(gradeSpinner);
                }
                for (int i = 0; i < gradeList.size(); i++){
                    gradeNames.add(gradeList.get(i).getGrade());
                }
                ArrayAdapter<String> gradeArrayAdapter = new ArrayAdapter<String> (Objects.requireNonNull(getActivity()), simple_spinner_item, gradeNames);
                gradeArrayAdapter.setDropDownViewResource(android.R.layout.simple_selectable_list_item);
                gradeSpinner.setAdapter(gradeArrayAdapter);

            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }