python - What are the steps to make a ModelForm work with a ManyToMany relationship with an intermediary model in Django?

python - What are the steps to make a ModelForm work with a ManyToMany relationship with an intermediary model in Django?

I have a Client and Groupe Model. A Client can be part of multiple groups. Clients that are part of a group can use its group's free rental rate at anytime but only once. That is where the intermedia…


java - Saving bidirectional ManyToMany

I have two entity classes annotated in the following way @Entity class A{@ManyToMany(mappedBy="A", cascade=CascadeType.ALL) private List<B> b;..}@Entity class B{@ManyToMany(cascade=C…


python - Generic many-to-many relationships

I'm trying to create a messaging system where a message's sender and recipients can be generic entities. This seems fine for the sender, where there is only object to reference(GenericForeignKey) but…


sql - Django: Order a model by a many-to-many field

I am writing a Django application that has a model for People, and I have hit a snag. I am assigning Role objects to people using a Many-To-Many relationship-where Roles have a name and a weight. I…


java - How to remove entity with ManyToMany relationship in JPA(and corresponding join table rows)?

Let's say I have two entities: Group and User. Every user can be member of many groups and every group can have many users. @Entity public class User{@ManyToMany Set<Group> groups;//...…


django - How to add data into ManyToMany field?

I can't find it anywhere, so your help will be nice for me:) Here is that field: categories=models.ManyToManyField(fragmentCategory) FragmentCategory: class fragmentCategory(models.Model):…


python - How to update manytomany field in Django?

Here's an example: If I have these classes class Author(models.Model): name=models.CharField(max_length=45) class Book(models.Model): name=models.CharField(max_length=45) authors=mo…


Many to many lookups in Django

This is probably insultingly simple and worthy of a Nelson Muntz laugh, but I'm having a real braindead moment tryng to make many to many connections across various model relationships. I have the fo…


python - Django:select_related with ManyToManyField

I have:class Award(models.Model):name=models.CharField(max_length=100, db_index=True) class Alias(models.Model):awards=models.ManyToManyField('Award', through='Achiever') class Ach…


django - Many to many relationships with additional data on the relationship

I'm trying to create a django database that records all my comic purchases, and I've hit a few problems. I'm trying to model the relationship between a comic issue and the artists that work on it. A c…





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