Apply fixes from StyleCI

[liu21st]

This pull request applies code style fixes from an analysis carried out by StyleCI.

---

For more information, click here.

[codecov-commenter]

Codecov Report

Attention: 415 lines in your changes are missing coverage. Please review.

Comparison is base (99cee09) 12.24% compared to head (fc681a1) 12.24%.

Files	Patch %	Lines
src/model/concern/RelationShip.php	0.00%	61 Missing ⚠️
src/db/BaseQuery.php	4.87%	39 Missing ⚠️
src/db/connector/Mongo.php	0.00%	39 Missing ⚠️
src/model/relation/HasManyThrough.php	0.00%	39 Missing ⚠️
src/model/concern/Attribute.php	0.00%	26 Missing ⚠️
src/model/relation/BelongsTo.php	0.00%	21 Missing ⚠️
src/model/relation/HasOne.php	0.00%	18 Missing ⚠️
src/model/relation/MorphTo.php	0.00%	17 Missing ⚠️
src/model/relation/HasMany.php	0.00%	15 Missing ⚠️
src/Paginator.php	0.00%	14 Missing ⚠️
... and 21 more

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff            @@
##                3.0     #517   +/-   ##
=========================================
  Coverage     12.24%   12.24%           
  Complexity     2965     2965           
=========================================
  Files            64       64           
  Lines          7129     7129           
=========================================
  Hits            873      873           
  Misses         6256     6256           

Flag	Coverage Δ
unittests	12.24% <6.53%> (ø)

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.