Reverse foreign key lookups

Now we have M2M, it makes sense to add something similar for reverse foreign key lookups.

This needs doing before v1.

Here’s an example API design:

class Manager(Table):
    name = Varchar()
    bands = ReverseLookup(LazyTableReference('Band', module_path=__module__))


class Band(Table):
    name = Varchar()
    manager = ForeignKey(Manager)


>>> await Manager.select(Manager.name, Manager.bands(Band.name, as_list=True))
[
    {
        "name": "Guido",
        "bands": ["Pythonistas"]
    }
]

[dantownsend]

One option is for the user to do something like this, which would give better tab completion:

class Manager(Table):
   name = Varchar()
   bands: ReverseLookup


class Band(Table):
    name = Varchar()
    manager = ForeignKey(Manager, reverse_lookup='bands')

[sinisaos]

@dantownsend Thank you for your reply. No need to add this to the docs because if anyone needs a workaround, they can find it here. I’ve updated the gist with your suggestion so it’s all there.