diff --git a/django_remote_submission/models.py b/django_remote_submission/models.py
index ed50c36adbdbae3851feed1e32fe33da88dfb225..f1ffcf15beea36b72556a33bb33f44f8199234de 100644
--- a/django_remote_submission/models.py
+++ b/django_remote_submission/models.py
@@ -64,8 +64,8 @@ class ListField(models.TextField):  # noqa: D101
         return str(value)
 
     def value_to_string(self, obj):  # noqa: D102
-        value = self._get_val_from_obj(obj)
-        return self.get_db_prep_value(value)
+        value = self.value_from_object(obj)
+        return self.get_prep_value(value)
 
 
 class Interpreter(TimeStampedModel):
diff --git a/tests/unit/test_models.py b/tests/unit/test_models.py
index 4919dbbd5a88393923fd032624371b747d8805c8..653757c1c6f0de906898683147d98de1d2dded52 100644
--- a/tests/unit/test_models.py
+++ b/tests/unit/test_models.py
@@ -8,7 +8,7 @@ test_django-remote-submission
 Tests for `django-remote-submission` models module.
 """
 # package imports
-from django_remote_submission.models import IdentityFileModel, Interpreter, Log, Job, Result, Server
+from django_remote_submission.models import ListField, IdentityFileModel, Interpreter, Log, Job, Result, Server
 from django_remote_submission.wrapper.remote import IdentityFile
 
 # third party imports
@@ -20,6 +20,7 @@ import pytest
 # standard imports
 from pathlib import Path
 import os
+from unittest.mock import MagicMock
 
 
 @pytest.fixture
@@ -72,6 +73,13 @@ def result(job):
     )
 
 
+@pytest.mark.django_db
+def test_interpreter_string_representation(interpreter):
+    assert str(interpreter.name) in str(interpreter)
+    assert str(interpreter.path) in str(interpreter)
+    assert str(interpreter.arguments) in str(interpreter)
+
+
 @pytest.mark.django_db
 def test_server_string_representation(server):
     assert str(server.title) in str(server)
@@ -96,6 +104,26 @@ def test_result_string_representation(result):
     assert str(result.job) in str(result)
 
 
+class TestListField:
+    def test_to_python(self):
+        for null_value in (None, "", [], 0):
+            assert isinstance(ListField().to_python(null_value), list)
+        items = [1, 2, 3]
+        assert id(ListField().to_python(items)) == id(items)
+        assert ListField().to_python('[1, 2, "three"]') == [1, 2, "three"]
+
+    def test_get_prep_value(self):
+        for null_value in ("", [], 0):
+            assert ListField().get_prep_value(null_value) == str(null_value)
+
+    def test_value_to_string(self):
+        items = ListField()
+        items.attname = 'mock_object'
+        obj = MagicMock()
+        obj.mock_object = 'fake'
+        assert items.value_to_string(obj) == 'fake'
+
+
 class TestIdentityFileModel:
     r'''
     @pytest.mark.django_db