TPT3 - add foreign key

api.py

# ...
from tastypie.resources import ModelResource, fields
# ...

class TodoItemResource(ModelResource):
    todo_list = fields.ForeignKey(TodoListResource, 'todo_list')

    class Meta:
        authentication = SessionAuthentication()
        authorization = AuthorizationByList()
        queryset = TodoItem.objects.all()
        resource_name = 'item'
        filtering = {
            'text': ('icontains',)
        }