Delete cascade

[wwwy3y3]

Is your feature request related to a problem? Please describe.
Delete mutation should have cascade feature.

Describe the solution you'd like
When deleting a record, the relationship data at other places (relation table, foreign key) should be deleted as well.

[jonesnc]

Maybe a directive could be provided that denotes whether a deletion should also cascade delete related records, leave related records alone, or throw an error when deletion of a record with related data is attempted.

Django offers these options with the on_delete argument of their ForeignKey relationship.

https://docs.djangoproject.com/en/2.1/ref/models/fields/#arguments

[wwwy3y3]

@jonesnc haven't check out Django api on the relationship before. Looks like we can actually use similar arguments on the cascade deletes part.

Thanks for the helpful information!