Set default value in field dependant on another model?

We have two models: Resources and Quota

Resources model instances include:

- red things

- yellow things 

- blue things

Quota have two fields, one is a FK to a Resource, the other is "desired quota".

When instantiating the Quota request form, we create a form for each Resource.

I'd like to autofill the "desired quota" field on each form, but make it dependent on which Resource it is representing.

IE, when someone makes a resource request, we expect them to want

1 red thing

5 yellow things

10 blue things

Do some searching, there's a lot pointing to Signals, but I remember someone once saying "if you are using signals, you should re-write you logic" or somesuch, so I thought I'd ask here.

FWIW - and this is well beyond my control - we are on Django 1.8

Cheers

L.

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"The fact that you're still saying something like 'feminism gone mad' suggests that feminism hasn't gone mad ENOUGH yet."

Helen Zaltzman / @HelenZaltzman
https://twitter.com/HelenZaltzman/status/1065384934846545920

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