Fix Search model to make sure _start_date and _end_date privateAttr are cleared on model initialization

CHANGELOG.md

@@ -1,6 +1,10 @@
 
 ## Unreleased
 
+## 3.1.5 (2025-02-28)
+
+- Fix `Search` model to make sure `_start_date` and `_end_date` privateAttr are cleared on model initialization
+
 ## 3.1.4 (2025-01-08)
 
 - Fix URL comparison for Landing page conformance (#163, @gadomski)

stac_pydantic/api/search.py

@@ -10,7 +10,15 @@
     Point,
     Polygon,
 )
-from pydantic import BaseModel, Field, TypeAdapter, field_validator, model_validator
+from pydantic import (
+    BaseModel,
+    Field,
+    PrivateAttr,
+    TypeAdapter,
+    ValidationInfo,
+    field_validator,
+    model_validator,
+)
 
 from stac_pydantic.api.extensions.fields import FieldsExtension
 from stac_pydantic.api.extensions.query import Operator
@@ -45,8 +53,8 @@ class Search(BaseModel):
     limit: Optional[int] = 10
 
     # Private properties to store the parsed datetime values. Not part of the model schema.
-    _start_date: Optional[dt] = None
-    _end_date: Optional[dt] = None
+    _start_date: Optional[dt] = PrivateAttr(default=None)
+    _end_date: Optional[dt] = PrivateAttr(default=None)
 
     # Properties to return the private values
     @property
@@ -96,9 +104,11 @@ def validate_bbox(cls, v: BBox) -> BBox:
 
         return v
 
-    @field_validator("datetime")
+    @field_validator("datetime", mode="after")
     @classmethod
-    def validate_datetime(cls, value: Optional[str]) -> Optional[str]:
+    def validate_datetime(
+        cls, value: Optional[str], info: ValidationInfo
+    ) -> Optional[str]:
         # Split on "/" and replace no value or ".." with None
         if value is None:
             return value
@@ -133,8 +143,9 @@ def validate_datetime(cls, value: Optional[str]) -> Optional[str]:
             )
 
         # Store the parsed dates
-        cls._start_date = dates[0]
-        cls._end_date = dates[1]
+        info.data["_start_date"] = dates[0]
+        info.data["_end_date"] = dates[1]
+
         # Return the original string value
         return value
 

tests/api/test_search.py

@@ -62,6 +62,19 @@ def test_temporal_search_single_tailed():
     assert search.end_date == utcnow
 
 
+def test_datetime_clean():
+    # ref: https://github.com/stac-utils/stac-pydantic/issues/170
+    utcnow = datetime.now(timezone.utc)
+    utcnow_str = utcnow.isoformat()
+    search = Search(datetime=utcnow_str)
+    assert search.start_date == utcnow
+    assert search.end_date == utcnow
+
+    search = Search()
+    assert not search.start_date
+    assert not search.end_date
+
+
 def test_temporal_search_two_tailed():
     # Test two tailed
     utcnow = datetime.now(timezone.utc)