fix for custom fields for includes (many-to-one direction)

[srepmub]

by passing missing include_fields parameter.

fixes issue #101 for me.

[m-antonov]

@srepmub thank you for your PR. Please fix the formatting and order of the 'included' in the tests. After that, the changes can be merged into the main branch.

[srepmub]

not entirely sure what you mean, but how about this..? (user1 and user2 are already in the right order though it seems?)

[srepmub]

fix a formatting issue.

[srepmub]

not sure why 'black' insists on putting certain things on a single line, but not similar code elsewhere. another attempt :P

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.44%. Comparing base (a1a4fc5) to head (ad7bc3a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #104   +/-   ##
=======================================
  Coverage   91.44%   91.44%           
=======================================
  Files          44       44           
  Lines        2408     2408           
  Branches      279      279           
=======================================
  Hits         2202     2202           
  Misses        143      143           
  Partials       63       63           

Flag	Coverage Δ
unittests	91.44% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
fastapi_jsonapi/views/view_base.py	93.05% <100.00%> (ø)

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[srepmub]

okay now 'ruff' fails.. will try to fix

[srepmub]

sorry for the delay. hope everything passes now.