fix(search): clear datetime between searches

[sbrunato]

Fixes #170

Clears _start_date and _end_date Search class variables between model instances.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.20%. Comparing base (a927d25) to head (274d083).
Report is 81 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #171      +/-   ##
==========================================
- Coverage   96.59%   96.20%   -0.39%     
==========================================
  Files          25       25              
  Lines         587      606      +19     
==========================================
+ Hits          567      583      +16     
- Misses         20       23       +3     

Flag	Coverage Δ
unittests	96.20% <100.00%> (-0.39%)	⬇️

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[vincentsarago]

Thanks for the PR @sbrunato 🙏

I feel we will have the same problem in https://github.com/stac-utils/stac-fastapi/blob/c71a355c46e53af40cd9ebe23bc151fa9faf8776/stac_fastapi/extensions/stac_fastapi/extensions/core/collection_search/request.py#L114-L156

To me it seems weird that the class attribute are not reseted to None on class initialization. I guess there is something I don't understand 🤔

[sbrunato]

I feel we will have the same problem in https://github.com/stac-utils/stac-fastapi/blob/c71a355c46e53af40cd9ebe23bc151fa9faf8776/stac_fastapi/extensions/stac_fastapi/extensions/core/collection_search/request.py#L114-L156

Yes, there is exactly the same issue in collection_search.

To me it seems weird that the class attribute are not reseted to None on class initialization.

I think that is because the attributes belong to the class, and are persistent through each new instantiation. Like in this:

>>> class Foo:
...     bar = None
... 
>>> Foo().bar
>>> Foo.bar = 1
>>> Foo().bar
1