Fix negative sign in formula output disappears when cell is selected (baserow#5167)

Author: stribny

backend/src/baserow/contrib/database/api/formula/serializers.py

@@ -19,7 +19,7 @@ class Meta:
         model = FormulaField
         fields = list(
             set(FormulaFieldType.serializer_field_names)
-            - {"available_collaborators", "select_options"}
+            - {"available_collaborators", "select_options", "number_negative"}
         )
 
 

backend/src/baserow/contrib/database/formula/types/formula_type.py

@@ -139,7 +139,7 @@ def get_serializer_field_names(cls) -> List[str]:
         return cls.all_fields()
 
     @classmethod
-    def get_serializer_field_overrides(cls) -> List[str]:
+    def get_serializer_field_overrides(cls) -> dict[str, any]:
         return {}
 
     @property

backend/src/baserow/contrib/database/formula/types/formula_types.py

@@ -379,6 +379,18 @@ class BaserowFormulaNumberType(
     can_group_by = True
     can_have_db_index = True
 
+    @classmethod
+    def get_serializer_field_names(cls):
+        return super().get_serializer_field_names() + ["number_negative"]
+
+    @classmethod
+    def get_serializer_field_overrides(cls):
+        return super().get_serializer_field_overrides() | {
+            "number_negative": serializers.BooleanField(
+                required=False, read_only=True, default=True
+            ),
+        }
+
     def __init__(
         self,
         number_decimal_places: int,

backend/tests/baserow/contrib/database/field/test_formula_field_type.py

@@ -1451,6 +1451,7 @@ def test_updating_formula_field_doesnt_reset_all_fields(data_fixture, api_client
         "formula_type": "date",
         "nullable": True,
         "number_decimal_places": None,
+        "number_negative": True,
     }
     actual = {key: value for key, value in response.json().items() if key in expected}
     assert actual == expected

changelog/entries/unreleased/bug/4323_negative_number_formula.json

@@ -0,0 +1,9 @@
+{
+    "type": "bug",
+    "message": "Fix negative sign in formula output disappearing when a cell is selected",
+    "issue_origin": "github",
+    "issue_number": 4323,
+    "domain": "database",
+    "bullet_points": [],
+    "created_at": "2026-04-10"
+}