[Fixed]-Override get_instance import-export django

Basically, you need to define custom InstanceLoader class in your resource inner Meta class:

class BookResource(resources.ModelResource):

    class Meta:
        model = Book
        fields = ('id', 'name', 'price',)
        instance_loader_class = MyCustomInstanceLoaderClass

class MyCustomInstanceLoaderClass(BaseInstanceLoader):
    def get_instance(self, row):
        # your implementation here

Something like this should help you.