Remove the Filter Extension dependency from Aggregation Extension req…

…uests (#716)

* aggregations type

* aggregations type

* remove filter extension dependency

* linting

* update changelog

CHANGES.md

@@ -6,6 +6,10 @@
 
 * Updated default filter language in filter extension's POST search request model to match the extension's documentation [#711](https://github.com/stac-utils/stac-fastapi/issues/711)
 
+### Removed
+
+* Removed the Filter Extension depenency from `AggregationExtensionPostRequest` and `AggregationExtensionGetRequest` [#716](https://github.com/stac-utils/stac-fastapi/pull/716)
+
 ## [3.0.0a3] - 2024-06-13
 
 ### Added

stac_fastapi/extensions/stac_fastapi/extensions/core/aggregation/request.py

@@ -1,24 +1,24 @@
 """Request model for the Aggregation extension."""
 
-from typing import List, Optional, Union
+from typing import List, Optional
 
 import attr
 
-from stac_fastapi.extensions.core.filter.request import (
-    FilterExtensionGetRequest,
-    FilterExtensionPostRequest,
+from stac_fastapi.types.search import (
+    BaseSearchGetRequest,
+    BaseSearchPostRequest,
+    str2list,
 )
-from stac_fastapi.types.search import BaseSearchGetRequest, BaseSearchPostRequest
 
 
 @attr.s
-class AggregationExtensionGetRequest(BaseSearchGetRequest, FilterExtensionGetRequest):
+class AggregationExtensionGetRequest(BaseSearchGetRequest):
     """Aggregation Extension GET request model."""
 
-    aggregations: Optional[str] = attr.ib(default=None)
+    aggregations: Optional[str] = attr.ib(default=None, converter=str2list)
 
 
-class AggregationExtensionPostRequest(BaseSearchPostRequest, FilterExtensionPostRequest):
+class AggregationExtensionPostRequest(BaseSearchPostRequest):
     """Aggregation Extension POST request model."""
 
-    aggregations: Optional[Union[str, List[str]]] = attr.ib(default=None)
+    aggregations: Optional[List[str]] = attr.ib(default=None)