Nested inlines example

nested-inlines.py

# models

class Part(models.Model):
    title = models.CharField(max_length=255)

class PartAttribute(models.Model):
    part = models.ForeignKey(Part, on_delete=models.CASCADE, null=True, related_name='attributes')
    name = models.CharField(max_length=128)

class PartAttributeChoice(models.Model):
    part = models.ForeignKey(Part, on_delete=models.CASCADE, null=True, related_name='choices')
    part_attribute = models.ForeignKey(PartAttribute, on_delete=models.CASCADE, null=True, related_name='attributes')
    name = models.CharField(max_length=128)
  

# admin

class PartAttributeChoiceInline(StackedInline):
    model = PartAttributeChoice
    fields = ('name',)


class PartAttributeInline(StackedInline):
    model = PartAttribute
    fields = ('name',)
    inlines = (PartAttributeChoiceInline,)


@admin.register(Part, site=formula_admin_site)
class PartModelAdmin(ModelAdmin):
    model = Part
    fields = ('title',)
    inlines = (PartAttributeInline, PartAttributeChoiceInline,)