m2m

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: (Django 1.1) I have a Project model that keeps track of its members using a m2m field. It looks like this: class Project ( models . Model ): members = models . ManyToManyField ( User ) sales_rep = models . ForeignKey ( User ) sales_mgr = models . ForeignKey ( User ) project_mgr = models . ForeignKey ( User ) ... ( more FK user fields ) ... When the project is created, the selected sales_rep , sales_mgr , project_mgr , etc User s are added to members to make it easier to keep track of project permissions. This approach has worked

I have the following model classes: class Category(models.Model): category = models.CharField('category', max_length=200, blank=False) class Book(models.Model): title = models.CharField('title', max_length=200, blank=False) categories = models.ManyToManyField(Category, blank=False, through='Book_Category') class Book_Category(models.Model): book = models.ForeignKey(Book) category = models.ForeignKey(Category) When adding a new book object in admin interface I would like to also add a new category, and book_category relationship. If I include categories in BookAdmin as class BookAdmin(admin

An example Many-to-Many through relationship in Django: class First(models.Model): seconds = models.ManyToManyField(Second, through='Middle') class Middle(models.Model): first = models.ForeignKey(First) second = models.ForeignKey(Second) class Second(models.Model): Following the documentation on intermediary models , only one model of the pair to be related contains the ManytoManyField , model First in the example above. Is this correct? If so, which model should contain the ManytoManyField field? Are there any differences in using the relationship from either end depending on where the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I have a Django model and I want to modify the object permissions on or just after save. I have tried a few solutions and the post_save signal seemed the best candidate for what I want to do: class Project ( models . Model ): title = models . CharField ( max_length = 755 , default = 'default' ) assigned_to = models . ManyToManyField ( User , default = None , blank = True , null = True ) created_by = models . ForeignKey ( User , related_name = "%(app_label)s_%(class)s_related" ) @receiver ( post_save , sender = Project ) def assign

I am using django-restframework for my API. I created a serializer which should list my objects and should be able to create them. I have a Contact entity and Product . There is a standard m2m between it for the likes . Here's my model: class Contact(models.Model): ... products_of_interest = models.ManyToManyField(Product, related_name="interested_contacts") My serializer is as simple as it gets: class ContactSerializer(serializers.ModelSerializer): class Meta: model = Contact When I list my contacts via this serializer I get all my contact objects with an array of product ids - awesome:

I recently started to use signals in my Django project (v. 1.3) and they all work fine except that I just can't figure out why the m2m_changed signal never gets triggered on my model. The Section instance is edited by adding/deleting PageChild inline instances on an django admin form. I tried to register the callback function either way as described in the documentation, but don't get any result. Excerpt from my models.py from django.db import models from django.db.models.signals import m2m_changed class Section(models.Model): name = models.CharField(unique = True, max_length = 100) pages =

Why doesn't my resource with a ManyToManyField update with this PUT request? curl --dump-header - -H "Content-Type: application/json" -X PUT --data '{"uuid":"blah","pass_token":"blah","favorites": ["/api/v1/organizations/1/"]}' http://localhost:8000/api/v1/devices/2/ I get this response: HTTP/1.0 400 BAD REQUEST Date: Wed, 11 Jul 2012 22:21:15 GMT Server: WSGIServer/0.1 Python/2.7.2 Content-Type: application/json; charset=utf-8 {"favorites": ["\"/api/v1/organizations/1/\" is not a valid value for a primary key."]} Here are my resources: class OrganizationResource(ModelResource): parent_org =

I am new to Django and didn't find any reference regarding this issue. I am getting this error when i use many to many field in django model(models.py). i guess the issue is assining m2m filed in view(views.py) from form(forms.py). How to assign m2m field in view. Django version 2.O python 3.5 models.py class User(AbstractUser): username=models.CharField(max_length=20) email = models.EmailField(_('email address'), unique=True) class Setupuser(models.Model): organization=models.CharField(max_length=200,blank=False,null=True) emails_for_help = models.ManyToManyField(User) views.py class Set_user