narrow down types for attributes passed to functions like Model.create/Model.build etc

[Danlock]

for issue #239
I wanted to typecheck upsert values as well, but it doesn't seem to have a generic overloaded method like all the others.

[codecov-io]

Codecov Report

Merging #249 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #249   +/-   ##
=======================================
  Coverage   96.71%   96.71%           
=======================================
  Files         115      115           
  Lines        1004     1004           
  Branches      129      129           
=======================================
  Hits          971      971           
  Misses         15       15           
  Partials       18       18

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[RobinBuschmann]

@Danlock Thanks for implementing :) I will look at it very soon!

[RobinBuschmann]

@Danlock Thanks again for your implementation. Works very well. There is one question left from my side: Why do you name the type GetAttributes? Why not ModelAttributes or something like that? :)

[Danlock]

Because rather than simply listing the models attributes, it gets attributes from a model. More of a function than a type really.

[RobinBuschmann]

@Danlock I would be more happy with ModelAttributes or so. But lets do this later. I will merge it. Thank you very much :)

[Danlock]

Maybe ParsedModelAttributes or FilteredModelAttributes? Thanks for merging.

[RobinBuschmann]

FilteredModelAttributes sounds good :)