Foreign key widget finds more than 1 value, how should i approach this

问题

I am using django-import-export library and I am trying to implement ForeignKey widget which is available to lookup related objects using Author.name instead of Author.pk. Now, the here is the tricky part for the given calendar year I only have one author with the same name, however, next year the author name will be similar. When i try to import, of course, it brings the issue saying that more than Author.name was found.

Is there a suggestion to solve the issue?

回答1:

I've used before_save_instance() to do something similar to this. Here's some pseudo-code for how this might work:

class MyModelResource(ModelResource):
    # Specify fields and Meta information here
    def before_save_instance(self, instance, using_transactions, dry_run):
        # Replace the below with your actual code
        year = instance.year
        author = Author.objects.filter(year=year)
        instance.author = author
        return instance

This assumes that the information you need to get the correct author is available in the row you're importing.

来源：https://stackoverflow.com/questions/55434001/foreign-key-widget-finds-more-than-1-value-how-should-i-approach-this