Cantools has no way to load frame of only one bus

[benuu]

Cantools.db.load_file right now loads all the frames of all the buses. No args in the load_file function to let the user load the frame of a specific bus.
When different buses have frames with the same ID, but different frame definitions, this can be a problem in the final messages returned by Cantools.db.load_file.

[andlaus]

I suppose that fixing this would require a medium-sized overhaul of cantool's current data model, namely to store all message objects within their respective bus objects instead of directly putting them into the database. While this is IMO quite doable, it is quite a bit of work and has the potential for breakage. I'll be happy to accept pull requests for this, though.

[wargithub]

I suppose that fixing this would require a medium-sized overhaul of cantool's current data model, namely to store all message objects within their respective bus objects instead of directly putting them into the database. While this is IMO quite doable, it is quite a bit of work and has the potential for breakage. I'll be happy to accept pull requests for this, though.

we got the same problem while using arxml.
expecting your fixing