django-models

问题 I have a Django data model like this (data fields omitted): class Atom(Model): pass class State(Model): atom = ForeignKey(Atom) class Transition(Model): atom = ForeignKey(Atom) upstate = ForeignKey(State,related_name='uptrans') lostate = ForeignKey(State,related_name='lotrans') When I query, the fields to be restricted can be in either model, so it is easiest to query on Transition.objects.filter(...) since all fields in the other models can be reached through the foreign keys. Let's call the

问题 I have a Django data model like this (data fields omitted): class Atom(Model): pass class State(Model): atom = ForeignKey(Atom) class Transition(Model): atom = ForeignKey(Atom) upstate = ForeignKey(State,related_name='uptrans') lostate = ForeignKey(State,related_name='lotrans') When I query, the fields to be restricted can be in either model, so it is easiest to query on Transition.objects.filter(...) since all fields in the other models can be reached through the foreign keys. Let's call the

问题 I'm reading and trying to understand django documentation so I have a logical question. There is my models.py file from django.db import models # Create your models here. class Blog(models.Model): name = models.CharField(max_length=255) tagline = models.TextField() def __str__(self): return self.name class Author(models.Model): name = models.CharField(max_length=255) email = models.EmailField() def __str__(self): return self.name class Post(models.Model): blog = models.ForeignKey(Blog)

问题 I'm reading and trying to understand django documentation so I have a logical question. There is my models.py file from django.db import models # Create your models here. class Blog(models.Model): name = models.CharField(max_length=255) tagline = models.TextField() def __str__(self): return self.name class Author(models.Model): name = models.CharField(max_length=255) email = models.EmailField() def __str__(self): return self.name class Post(models.Model): blog = models.ForeignKey(Blog)

问题 I have this "Jobs Server" model that i'm building. I want to include a field that will save which days of the week this job will run on. Ultimately in the UI, i would like the user to be able to have a series of check boxes(one for each day) that they can select. What would be the best way to represent this "days-of-week" data in my mode? class Job(models.Model): name = models.CharField(max_length=32, unique=True) package = models.ForeignKey(Package) binary = models.ForeignKey(Binary) host =

问题 Hello, thanks for your time. i'm trying to import models on seeders.py. Can someone please tell me what am i doing wrong, i've done this a hundred times and tried every single way: from winners.models import Player or from ..models import Player models.py: from django.db import models class Player (models.Model): name = models.CharField(max_length=100) sex = models.CharField(max_length=9, choices=sex_choices) age = models.PositiveIntegerField() height = models.DecimalField(max_digits=3,

问题 Hello, thanks for your time. i'm trying to import models on seeders.py. Can someone please tell me what am i doing wrong, i've done this a hundred times and tried every single way: from winners.models import Player or from ..models import Player models.py: from django.db import models class Player (models.Model): name = models.CharField(max_length=100) sex = models.CharField(max_length=9, choices=sex_choices) age = models.PositiveIntegerField() height = models.DecimalField(max_digits=3,

问题 I am trying to convert my datetime to unix timestamp. I've tried doing several ways and the error is all the same. I am not very sure what I am suppose to do. date_joined is like this 2017-09-30 10:24:44.954981+00:00 function unix_timestamp(timestamp with time zone) does not exist HINT: No function matches the given name and argument types. You might need to add explicit type casts. User.objects.annotate(photo_time=Func(F('date_joined'),function='UNIX_TIMESTAMP')) User.objects.extra(select={

问题 I write the migration manually to quickly add to the new environment. When I try to create a new object of the Operator model I get an error about an empty id. I tried to set managed = False in meta and fake Operator model but none of this brought results. What's wrong with my code? My model: class Operator(models.Model): id = models.IntegerField(primary_key=True) name = models.CharField(max_length=256) class Meta: db_table = '"mts_market"."operator"' managed = False def __str__(self): return

问题 I have a model which contains FileField as below class Employer(models.Model): logo = models.FileField(storage=FileSystemStorage(location=settings.MEDIA_ROOT), upload_to='logos') The question is how can I add a default file like "{{ MEDIA_ROOT}}/logos/anonymous.jpg" to this filefield ? 回答1: You can specify the default file to use for that field as follows: class Employer(models.Model): logo = models.FileField(storage=FileSystemStorage(location=settings.MEDIA_ROOT), upload_to='logos', default=