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A ManyToManyField in Django is a field that allows multiple objects to be stored. This is useful and applicable for things such as shopping carts, where a user can buy multiple products. To add an item to a ManyToManyField, we can use the add() function.
You would have to add blank=True as well in field definition. If the model field has blank=True, then required is set to False on the form field. Otherwise, required=True. Don't forget to reset and sync DB again after changing this.
A ManyToMany field is used when a model needs to reference multiple instances of another model. Use cases include: A user needs to assign multiple categories to a blog post. A user wants to add multiple blog posts to a publication.
If you want to be able to specify ManyToMany relation without making it required just use blank=True:
class Group(models.Model):
...
events = models.ManyToManyField(Event, blank=True)
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