Position field missing for Module Bay bulk creation

[sleepinggenius2]

NetBox version

v3.2.1

Python version

3.8

Steps to Reproduce

1. Select one of more devices from the Devices list
2. Click on Add Components > Module Bays
3. Observe there is no Position field

Expected Behavior

The bulk creation form for Module Bays should have a Position field just like the singular add form.

Observed Behavior

The Position field does not exist on the bulk creation form.

[sleepinggenius2]

I've checked this in v3.2.2 and v3.2.3 and it doesn't actually seem to be working. The field shows up in the form and the module bays are created, but the position fields are empty.

[sleepinggenius2]

@jeremystretch, can we reopen this issue or do you need me to open a new one? I finally tracked down what I believe to be the source of this bug and I'm not 100% on how to fix it, but I'm willing to give it a shot.

The DeviceBulkAddModuleBayView class in netbox/dcim/views.py inherits from generic.BulkComponentCreateView, but in that class (within netbox/netbox/views/generic/bulk_views.py), the post function is hard-coded for name_pattern and label_pattern.

The ModuleBayCreateView class in netbox/dcim/views.py inherits from generic.ComponentCreateView and sets patterned_fields = ('name', 'label', 'position'), then in that class (within netbox/netbox/views/generic/object_views.py), the post function uses the patterned_fields variable to set the appropriate values.

This would explain why the position field is being properly set for the single component creation, but not the bulk.

[sleepinggenius2]

I believe that I have a working solution, if you would like me to submit a PR.