django-models

问题 Is there any way of using get_object_or_404 and select_related together or any other way to achieve the result of using these two together(except from putting it in try/except)?? 回答1: Yes. obj = get_object_or_404(MyModel.objects.select_related(), whatever=whatever) 来源： https://stackoverflow.com/questions/6624530/django-using-select-related-and-get-object-or-404-together

问题 Here I am using a non custom user model for saving the users registered and their details are stored in user_requirement model now I want to validate before logging in to the dashboard My models.py: class user(models.Model): username=models.CharField(max_length=20) email=models.CharField(max_length=50,unique=True) password=models.CharField(max_length=50,default='0000000') created_at = models.DateTimeField(default=datetime.now) updated_at = models.DateTimeField(default=datetime.now) def __str_

问题 Good afternoon, I have seen similar questions but none of the answers really resonate with me. I am new to django development and am trying to get use to the models. My question is how do I utilize a model from one app in another appropriately? For instance, I have a project, Project 1 that consists of the a Person app that manages the users profile. This app has the model for a person, but then that person is used in Activities for the activities they have completed, and another progress in

问题 Good afternoon, I have seen similar questions but none of the answers really resonate with me. I am new to django development and am trying to get use to the models. My question is how do I utilize a model from one app in another appropriately? For instance, I have a project, Project 1 that consists of the a Person app that manages the users profile. This app has the model for a person, but then that person is used in Activities for the activities they have completed, and another progress in

问题 I have already many models in my application. I have already used migrations in my project. But when I want to remove a field from a model, the makemigration command show me : Unknown field(s) (field) specified for Model Where (fields) is equal to the field's name and Model is the model's name ? Do you have any solution to resolve this issue ? 回答1: You may try modifying auto_now and auto_now_add with default = 'xxx', then the field can be called 来源： https://stackoverflow.com/questions

问题 I have already many models in my application. I have already used migrations in my project. But when I want to remove a field from a model, the makemigration command show me : Unknown field(s) (field) specified for Model Where (fields) is equal to the field's name and Model is the model's name ? Do you have any solution to resolve this issue ? 回答1: You may try modifying auto_now and auto_now_add with default = 'xxx', then the field can be called 来源： https://stackoverflow.com/questions

问题 I'm trying to add django-seo into my site. But I can't cope with setting up. I followed instructions documentation, but error occurs. This is what I did: Installed django-seo packacge Added rollyourown.seo to INSTALED_APPS Created seo.py file in my site content app And this is what I wrote into seo.py file: from rollyourown import seo class Metadata(seo.Metadata): title = seo.Tag(head=True, max_length=68) description = seo.MetaTag(max_length=155) keywords = seo.KeywordTag() heading = seo.Tag

问题 I am not able to find the way to annotate a queryset with a count of how many times an element is used in a many-to-many relationship. class Profile(models.Model): [...] # Profile can have multiple roles roles = models.ManyToManyField('Role', blank=True) [...] class Role(models.Model): company = models.ForeignKey(Company, on_delete=models.CASCADE) name = models.CharField(blank=True, max_length=30) description = models.CharField(blank=True, max_length=300) [...] For example I would have 5

问题 I have a form in which, user specifies lawyer-spec and save the data to the database. However I get an error that **null value in column "lawyer_spec" violates not-null constraint** So the data from the form is not processed properly. EDIT: mthod form_invalid prints empty line, and then two numbers ('pk' and 'lawyer_id') forms.py class MakeAppointmentForm(forms.ModelForm): first_name = forms.CharField(required=True) class Meta: model = CalendarAppointmentsReserved fields = ['case'] def __init

问题 In my Django project the in one of the model I need to use two UniqueConstraint instances. But when I add that and do the migration after running makemigrations it gives an error in the terminal. Model class: class MyDays(models.Model): class Meta: verbose_name = "My Day" verbose_name_plural = "My Days" constraints = [ models.UniqueConstraint(fields=['userid', 'date', 'from'], condition=Q(status=1), name='user_date_from_a'), models.UniqueConstraint(fields=['userid', 'date', 'to'], condition=Q