PHPORM-75 Defer Model::unset($field) to the save()

[GromNaN]

Fix #2566 and PHPORM-75.

• Breaking change: All calls to $model->unset($field), $model->drop($field), unset($model[$field]), unset($model->field) must be followed by $model->save() so they are persisted.

  $user = User::find($key);
  unset($user->age);
+ $user->save();

• Deprecate Model::drop($field), it's a duplicate of Model::unset($field). The native unset($model->field) is recommended.

• Query\Builder::update() accept a mix of field names and update operators.

DB::collection('users')->where(...)->update([
    '$inc' => ['age' => 1],
    'last_birthday' => new UTCDateTime(),
]);

Todo:

• changelog
• relations
• nested model / objects

[codecov-commenter]

Codecov Report

Patch coverage: 78.26% and project coverage change: -0.20% ⚠️

Comparison is base (f330412) 90.83% compared to head (61cbb31) 90.64%.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2578      +/-   ##
============================================
- Coverage     90.83%   90.64%   -0.20%     
- Complexity      752      758       +6     
============================================
  Files            34       34              
  Lines          1834     1849      +15     
============================================
+ Hits           1666     1676      +10     
- Misses          168      173       +5     

Files Changed	Coverage Δ
src/Eloquent/Model.php	90.15% <73.68%> (-2.07%)	⬇️
src/Query/Builder.php	94.53% <100.00%> (+0.02%)	⬆️

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[alcaeus]

It's nice to see this gone! :)

[GromNaN]

I'm not sure why the method unset was not declared. It might be to allow a relation named unset.

[alcaeus]

I believe there was a separate issue where the model was not marked as dirty - maybe assert on isDirty as well?

[GromNaN]

It was not dirty since the change was done directly in the database.
I added the assertions on isDirty for exhautivity.