Add parent reference to embedded containers

[rytilahti]

Allows embedded containers to access data from other embeddeds or the main status.

[codecov-commenter]

Codecov Report

Merging #1711 (20b162a) into master (6a71870) will increase coverage by 0.00%.
The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##           master    #1711   +/-   ##
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  Coverage   81.74%   81.74%           
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  Files         191      191           
  Lines       17935    17937    +2     
  Branches     3845     3845           
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+ Hits        14661    14663    +2     
  Misses       2986     2986           
  Partials      288      288           

Impacted Files	Coverage Δ
miio/devicestatus.py	91.74% <100.00%> (+0.15%)	⬆️

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[starkillerOG]

Should we not make some changes to getattr of DeviceStatus to make sure a embeded container can acces the master/other embeded properties?

[rytilahti]

The embedded container can use _parent to access its parent, and then use _embedded to find other child containers. We could introduce a helper method to access embedded ones by name if that's what you are looking for?

[starkillerOG]

@rytilahti I ment we could make it such that we can use getattr(self, "MapList__map_name_dict") for example from within another embeded status container.
And then maybe getattr(self, "Main__battery") for example to acces stuff from the main container from within a embeded container.

[rytilahti]

You can already access the parent as well as other embedded containers like this:

battery = self._parent.battery  # it's better to use attribute access over getattr
consumables = self._parent.consumables

main_brush_used = self._parent.consumables.main_brush
main_brush_used_another_syntax = self._parent.consumables__main_brush  # the one above is preferred

Is that not enough for the use case at hand?

[starkillerOG]

@rytilahti fair, I think this will surfice, we will do it as you illustrated.
I do think mypy is going to complain about self._parent.consumables not existing, but we will deal with that later.

[starkillerOG]

I tested this and it is working. I implemented it in the Roborock multi map PR: #1614