fix: Fix get_corporate_announcements() (#480)

* fix: adjust case for test_get_announcements

* fix: fix CorporateActionAnnouncement

alpaca/trading/models.py

@@ -577,9 +577,9 @@ class CorporateActionAnnouncement(ModelWithID):
         target_original_cusip (Optional[str]): CUSIP of the child company involved in the announcement.
         declaration_date (Optional[date]): Date the corporate action or subsequent terms update was announced.
         ex_date (Optional[date]): The first date that purchasing a security will not result in a corporate action entitlement.
-        record_date (date): The date an account must hold a settled position in the security in order to receive the
+        record_date (Optional[date]): The date an account must hold a settled position in the security in order to receive the
             corporate action entitlement.
-        payable_date (date): The date the announcement will take effect. On this date, account stock and cash
+        payable_date (Optional[date]): The date the announcement will take effect. On this date, account stock and cash
             balances are expected to be processed accordingly.
         cash (float): The amount of cash to be paid per share held by an account on the record date.
         old_rate (float): The denominator to determine any quantity change ratios in positions.
@@ -595,8 +595,8 @@ class CorporateActionAnnouncement(ModelWithID):
     target_original_cusip: Optional[str] = None
     declaration_date: Optional[date] = None
     ex_date: Optional[date] = None
-    record_date: date
-    payable_date: date
+    record_date: Optional[date] = None
+    payable_date: Optional[date] = None
     cash: float
     old_rate: float
     new_rate: float

tests/trading/trading_client/test_corporate_announcements.py

@@ -59,8 +59,6 @@ def test_get_announcements(reqmock, trading_client: TradingClient):
             "ca_sub_type": "cash",
             "initiating_symbol": "KKR",
             "initiating_original_cusip": "G52830109",
-            "record_date": "2021-11-15",
-            "payable_date": "2021-11-30",
             "cash": "0.145",
             "old_rate": "1",
             "new_rate": "1"