问题
I wonder if anyone would know a way to return the categories related to the session chosen in the select options.
Example:
class Session(models.Model):
name = models.CharField("Sessão", max_length=100)
slug = models.SlugField("Slug", max_length=100)
class Category(models.Model):
session = models.ForeignKey(Session, verbose_name='Sessão', on_delete=models.CASCADE, max_length=100, default=1, blank=True, null=True)
category = models.CharField("Categoria", max_length=100)
slug = models.SlugField("Slug", max_length=100)
class Article(models.Model):
category = models.ForeignKey(Category, verbose_name='Categoria', on_delete=models.CASCADE, max_length=100, default=1, blank=True, null=True)
session = models.ForeignKey(Session, verbose_name='Sessão', on_delete=models.CASCADE, max_length=100, default=1, blank=True, null=True)
When registering an Article, I would define a session for the article, and then I would like to return categories, only the categories related to that session.
Can anybody help me ? I believe this would have to be dynamically ...
Strong hug!
回答1:
1st solution:
Override the template (Django Documentation can help you with that)
Onchange of the field, you need to make an ajax call to an API which takes in session_id and returns you all the categories. Fill the returned result into categories through JS.
Also, you can give a try to django-ajax-selects
2nd solution: (without JS/AJAX)
To register an article, You can first go to session admin and then have a link there to add an article.
a. If you want to do it changeform_view then, You can use inline admin and override its form init() to prepopulate the categories.
b. If you want the link in changelist_view,
http://localhost:8000/admin/<app>/article/add/?session_id=<>
You can override the Article Admin form init() and read the session_id passed and use it accordingly.
来源：https://stackoverflow.com/questions/50799470/limit-the-choices-for-objects-related-to-the-chosen-in-the-select