Handle uploading already-present files in new API

[jwodder]

Closes #345.

[codecov]

Codecov Report

Merging #347 (034d3e1) into master (53da9e9) will increase coverage by 1.66%.
The diff coverage is 98.11%.

@@            Coverage Diff             @@
##           master     #347      +/-   ##
==========================================
+ Coverage   82.15%   83.82%   +1.66%     
==========================================
  Files          55       55              
  Lines        5454     5935     +481     
==========================================
+ Hits         4481     4975     +494     
+ Misses        973      960      -13     

Flag	Coverage Δ
unittests	83.82% <98.11%> (+1.66%)	⬆️

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Impacted Files	Coverage Δ
dandi/dandiapi.py	86.79% <75.00%> (+0.58%)	⬆️
dandi/tests/test_dandiapi.py	100.00% <100.00%> (ø)
dandi/tests/test_upload.py	93.30% <100.00%> (+3.94%)	⬆️
dandi/upload.py	79.78% <100.00%> (+9.93%)	⬆️
dandi/download.py	84.86% <0.00%> (-0.33%)	⬇️
dandi/metadata.py	82.07% <0.00%> (+3.04%)	⬆️
dandi/models.py	89.37% <0.00%> (+4.73%)	⬆️

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[jwodder]

The PR includes the requested tests, but several of them currently fail (and are marked xfailing) due to #345 (comment) and dandi/dandi-archive#70 not yet being addressed.

[yarikoptic]

Thank you @jwodder . I guess we are just doomed to wait for dandi/dandi-archive#70 to get implemented (outstanding PR: dandi/dandi-archive#75)

[yarikoptic]

there is dandisets_versions_assets_delete endpoint now, so it is possible to proceed

[jwodder]

Found another blocking bug: dandi/dandi-archive#76

[yarikoptic]

dandi/dandi-archive#76 was addressed, so should be possible to proceed forward.

[jwodder]

A new blocking bug: dandi/dandi-archive#81

[yarikoptic]

I have just merged dandi/dandi-archive#84 which should provide remedy (even if later to be refactored) so we could proceed here.

[jwodder]

@yarikoptic Tests finally pass.

[yarikoptic]

awesome -- let's proceed!