diff --git a/superset/models/slice.py b/superset/models/slice.py
index f47f424fc3e2..f6379f0e77d9 100644
--- a/superset/models/slice.py
+++ b/superset/models/slice.py
@@ -363,7 +363,7 @@ def get_query_context_factory(self) -> QueryContextFactory:
 
     @classmethod
     def get(cls, id_or_uuid: str) -> Slice:
-        qry = db.session.query(Slice).filter_by(id_or_uuid_filter(id_or_uuid))
+        qry = db.session.query(Slice).filter(id_or_uuid_filter(id_or_uuid))
         return qry.one_or_none()
 
 
diff --git a/tests/integration_tests/charts/api_tests.py b/tests/integration_tests/charts/api_tests.py
index 1b95ed1f6398..381e3f684606 100644
--- a/tests/integration_tests/charts/api_tests.py
+++ b/tests/integration_tests/charts/api_tests.py
@@ -15,6 +15,7 @@
 # specific language governing permissions and limitations
 # under the License.
 
+import uuid
 from io import BytesIO
 from unittest import mock
 from unittest.mock import patch
@@ -1076,6 +1077,43 @@ def test_get_chart_not_found(self):
         rv = self.get_assert_metric(uri, "get")
         assert rv.status_code == 404
 
+    @parameterized.expand(
+        [
+            ("by_id", lambda chart: str(chart.id), "id"),
+            (
+                "by_uuid",
+                lambda chart: str(chart.uuid) if chart.uuid else pytest.skip("No UUID"),
+                "uuid",
+            ),
+        ]
+    )
+    def test_slice_get_existing(self, test_name, get_identifier, field_type):
+        """Test Slice.get() successfully retrieves existing charts."""
+        admin = self.get_user("admin")
+        chart = self.insert_chart(f"test_slice_get_{field_type}", [admin.id], 1)
+
+        identifier = get_identifier(chart)
+        result = Slice.get(identifier)
+
+        assert result is not None
+        assert result.id == chart.id
+        if field_type == "uuid" and chart.uuid:
+            assert result.uuid == chart.uuid
+
+        db.session.delete(chart)
+        db.session.commit()
+
+    @parameterized.expand(
+        [
+            ("nonexistent_id", "999999"),
+            ("nonexistent_uuid", str(uuid.uuid4())),
+        ]
+    )
+    def test_slice_get_not_found(self, test_name, identifier):
+        """Test Slice.get() returns None for non-existent identifiers."""
+        result = Slice.get(identifier)
+        assert result is None
+
     @pytest.mark.usefixtures("load_birth_names_dashboard_with_slices")
     def test_get_chart_no_data_access(self):
         """
diff --git a/tests/unit_tests/models/slice_test.py b/tests/unit_tests/models/slice_test.py
new file mode 100644
index 000000000000..3b9f0666c958
--- /dev/null
+++ b/tests/unit_tests/models/slice_test.py
@@ -0,0 +1,86 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+import uuid
+from unittest.mock import MagicMock, patch
+
+import pytest
+from parameterized import parameterized
+
+from superset.models.slice import id_or_uuid_filter, Slice
+
+
+class TestSlice:
+    """Test cases for Slice model functionality."""
+
+    @parameterized.expand(
+        [
+            ("numeric_id", "123"),
+            ("uuid_string", "550e8400-e29b-41d4-a716-446655440000"),
+        ]
+    )
+    def test_slice_get_calls_filter_correctly(self, test_name, id_or_uuid):
+        """Test Slice.get() calls filter() correctly for ID and UUID."""
+        with patch("superset.models.slice.db") as mock_db:
+            # Setup mock chain
+            mock_query = MagicMock()
+            mock_filtered_query = MagicMock()
+            mock_db.session.query.return_value = mock_query
+            mock_query.filter.return_value = mock_filtered_query
+            mock_filtered_query.one_or_none.return_value = None
+
+            # Call the method
+            result = Slice.get(id_or_uuid)
+
+            # Verify correct methods called
+            mock_db.session.query.assert_called_once_with(Slice)
+            mock_query.filter.assert_called_once()  # Not filter_by!
+            mock_filtered_query.one_or_none.assert_called_once()
+            assert result is None
+
+    @parameterized.expand(
+        [
+            ("numeric_id", "123"),
+            ("large_id", "999999"),
+            ("uuid_string", str(uuid.uuid4())),
+        ]
+    )
+    def test_slice_get_no_type_error(self, test_name, input_value):
+        """Verify Slice.get() doesn't raise TypeError for various inputs."""
+        try:
+            result = Slice.get(input_value)
+            # Success - no TypeError, result can be None or a Slice
+            assert result is None or hasattr(result, "id")
+        except TypeError as e:
+            if "filter_by() takes 1 positional argument" in str(e):
+                pytest.fail(
+                    f"filter_by() bug exists: Slice.get('{input_value}') failed with {e}"  # noqa: E501
+                )
+            else:
+                raise
+
+    @parameterized.expand(
+        [
+            ("numeric_id", "123"),
+            ("uuid_format", "550e8400-e29b-41d4-a716-446655440000"),
+            ("invalid_string", "not-a-number"),
+        ]
+    )
+    def test_id_or_uuid_filter(self, test_name, input_value):
+        """Test id_or_uuid_filter returns correct BinaryExpression."""
+        result = id_or_uuid_filter(input_value)
+        assert result is not None