fix: change date fields in AffiliationOrganizationFields to string type and add date parsing util

Signed-off-by: Yeganathan S <63534555+skwowet@users.noreply.github.com>

Author: skwowet

services/apps/git_integration/src/crowdgit/models/affiliation_info.py

@@ -20,8 +20,8 @@ class AffiliationOrganizationFields(BaseModel):
 
     name: str | None = None
     domain: str | None = None
-    date_start: date | None = Field(default=None, alias="dateStart")
-    date_end: date | None = Field(default=None, alias="dateEnd")
+    date_start: str | None = Field(default=None, alias="dateStart")
+    date_end: str | None = Field(default=None, alias="dateEnd")
     is_unaffiliated: bool = Field(default=False, alias="isUnaffiliated")
 
     model_config = {"populate_by_name": True}

services/apps/git_integration/src/crowdgit/services/affiliation/affiliation_service.py

@@ -348,6 +348,13 @@ def _strip(value: str | None) -> str | None:
         stripped = value.strip()
         return stripped or None
 
+    @staticmethod
+    def _parse_optional_date(value: str | None) -> date | None:
+        stripped = AffiliationService._strip(value)
+        if not stripped:
+            return None
+        return date.fromisoformat(stripped)
+
     @classmethod
     def group_parse_rows(
         cls, rows: list[AffiliationParseRow]
@@ -384,8 +391,8 @@ def group_parse_rows(
                 stint = AffiliationOrganizationStint(
                     name="Individual",
                     domain="individual-noaccount.com",
-                    date_start=organization.date_start,
-                    date_end=organization.date_end,
+                    date_start=cls._parse_optional_date(organization.date_start),
+                    date_end=cls._parse_optional_date(organization.date_end),
                     is_unaffiliated=True,
                 )
             elif not domain:
@@ -394,8 +401,8 @@ def group_parse_rows(
                 stint = AffiliationOrganizationStint(
                     name=cls._strip(organization.name),
                     domain=domain.lower(),
-                    date_start=organization.date_start,
-                    date_end=organization.date_end,
+                    date_start=cls._parse_optional_date(organization.date_start),
+                    date_end=cls._parse_optional_date(organization.date_end),
                     is_unaffiliated=False,
                 )