django-models

来源： https://stackoverflow.com/questions/24727697/django-which-file-types-does-djangos-image-field-support-not-support-by-def

来源： https://stackoverflow.com/questions/41848519/how-to-create-a-new-model-object-when-a-user-signs-up-using-django-all-auth

来源： https://stackoverflow.com/questions/56486459/how-to-filter-reduce-a-queryset-to-every-nth-row

问题 Let's say I have a model, employee : Employee Name: CharField Email: EmailField Type: ForeignKey The problem is with the type field. I want the foreign key to be able to be several different types of models . For example, one for Software Developer , another for Janitor , and so on. I could do this by having a foreign key field for all types, and setting many to null, but this seems bad. Does this make sense? How can I achieve this? Thanks!! 回答1: There are many ways you can model this level

问题 Let's say I have a model, employee : Employee Name: CharField Email: EmailField Type: ForeignKey The problem is with the type field. I want the foreign key to be able to be several different types of models . For example, one for Software Developer , another for Janitor , and so on. I could do this by having a foreign key field for all types, and setting many to null, but this seems bad. Does this make sense? How can I achieve this? Thanks!! 回答1: There are many ways you can model this level

问题 I have scenario in which a user can have multiple books. I can create two different models for user and books and relate them using foreign keys (or one-to-many will be right way ?). I have created a django forms for User model but when i do like this {{form.as_p}} in templates only user model fields is shown not books field. I want that with user fields my books model filed also displayed (like book names field more then once because he can have multiple books) , Please let me know if it is

问题 How to override bulk_create method? I try this class SomeModel(models.Model): field = models.CharField() def bulk_create(self, objs, batch_size=None): #do something return super(SomeModel, self).bulk_create(objs, batch_size) But it doesn't work. When I run this code SomeModel.objects.bulk_create(objects_list) It's create new objects, but it doesn't use my override bulk_create method. Is it possible to override bulk_create? And how? 回答1: bulk_create is a method on the Manager class, and

问题 How to override bulk_create method? I try this class SomeModel(models.Model): field = models.CharField() def bulk_create(self, objs, batch_size=None): #do something return super(SomeModel, self).bulk_create(objs, batch_size) But it doesn't work. When I run this code SomeModel.objects.bulk_create(objects_list) It's create new objects, but it doesn't use my override bulk_create method. Is it possible to override bulk_create? And how? 回答1: bulk_create is a method on the Manager class, and

问题 My models.py looks like this: import random random_string = str(random.randint(10000, 99999)) class Content(models.Model): ...... unique_url = models.CharField(default = random_string) When I add a content in admin, an integer in the range is generated and put into the charfield as its default value. From there, I can simple add more words to the charfield. However, the problem with my current set-up is that the integer remains the same every time I add a new article. I want to generate and

问题 My models.py looks like this: import random random_string = str(random.randint(10000, 99999)) class Content(models.Model): ...... unique_url = models.CharField(default = random_string) When I add a content in admin, an integer in the range is generated and put into the charfield as its default value. From there, I can simple add more words to the charfield. However, the problem with my current set-up is that the integer remains the same every time I add a new article. I want to generate and