django-models

问题 I have a queryset and I want to apply function (port_to_app) to its field (dst_port). And then access it from template. How do I do that? I've read about filters and tags, but can't understand the way they work. models.py class FlowQuerySets(models.QuerySet): def top_app(self): return self.values('dst_port')\ .annotate(traffic=Sum('bytes')).order_by('-traffic')[:10] class Flow(models.Model): id = models.BigIntegerField(primary_key = True) ip_src = models.CharField(max_length=15) ip_dst =

问题 I want to populate, in my django application, my table from base.html with the results from urlparse.py (this returns a list of 20 URLs from a site). models.py from django.db import models from django.utils.encoding import smart_unicode # Create your models here. urlparse.py import HTMLParser, urllib2 class MyHTMLParser(HTMLParser.HTMLParser): site_list = [] def reset(self): HTMLParser.HTMLParser.reset(self) self.in_a = False self.next_link_text_pair = None def handle_starttag(self, tag,

问题 I want to populate, in my django application, my table from base.html with the results from urlparse.py (this returns a list of 20 URLs from a site). models.py from django.db import models from django.utils.encoding import smart_unicode # Create your models here. urlparse.py import HTMLParser, urllib2 class MyHTMLParser(HTMLParser.HTMLParser): site_list = [] def reset(self): HTMLParser.HTMLParser.reset(self) self.in_a = False self.next_link_text_pair = None def handle_starttag(self, tag,

问题 This example is from the Django documentation. Given the (Django) database model: class Blog(models.Model): name = models.CharField(max_length=100) class Entry(models.Model): blog = models.ForeignKey(Blog) headline = models.CharField(max_length=255) body_text = models.TextField() In Django I can use: Entry.objects.filter(blog__name__exact='Beatles Blog') to get all Entry objects for blogs with the specified name. Question : What is the equivalent SQLAlchemy statement, given the model

问题 I have table project, project has sub project and subproject has developers. Another table sprint, work distribute in sprint 1 2 ..n so on, Each sprint has different developers data. Now How can i calculate sum, current sprint value and percentage complete Using Django Orm. Project has sub project foreign key class project(models.Model): title = models.CharField(max_length=150) project = models.ForeignKey("self", on_delete=models.CASCADE, related_name="subproject", blank=True, null=True)

问题 I have a model containing file field. I want to restrict it to pdf files. I have written clean method in model because I want to check for admin and shell level model creation also. But it is not working in model clean method. However form clean method is working. class mymodel(models.Model): myfile = models.FileField() def clean(): mime = magic.from_buffer(self.myfile.read(), mime=True) print mime if not mime == 'application/pdf': raise ValidationError('File must be a PDF document') class

问题 I recently ask this question Custom Django MultilingualTextField model field but I found no good reason why I should not do this, so I create a model Field that support multilingual text, auto return text in current language. This basically is the field that store custom Language object to database in json format. Here is the code: Github: https://github.com/james4388/django-multilingualfield Ussage: from django.db import models from multilingualfield import MLTextField, MLHTMLField class

问题 I'm having trouble transferring my query to django. In sqlite3 it looked like this: SELECT A, MIN(B), MAX(B) from table GROUP BY A This would output unique values from A with a range of values from B Any hints on how to approach this? Is it even possible in django? 回答1: You can use values() for the GROUP BY , and annotate() for the MIN and MAX : from django.db.models import Min, Max MyModel.objects.values('A').annotate(min_b=Min('B'), max_b=Max('B')) You'll get a list of dictionaries,

问题 I have a Django system that runs billing for thousands of customers on a regular basis. Here are my models: class Invoice(models.Model): balance = models.DecimalField( max_digits=6, decimal_places=2, ) class Transaction(models.Model): amount = models.DecimalField( max_digits=6, decimal_places=2, ) invoice = models.ForeignKey( Invoice, on_delete=models.CASCADE, related_name='invoices', null=False ) When billing is run, thousands of invoices with tens of transactions each are created using

问题 I have a Django system that runs billing for thousands of customers on a regular basis. Here are my models: class Invoice(models.Model): balance = models.DecimalField( max_digits=6, decimal_places=2, ) class Transaction(models.Model): amount = models.DecimalField( max_digits=6, decimal_places=2, ) invoice = models.ForeignKey( Invoice, on_delete=models.CASCADE, related_name='invoices', null=False ) When billing is run, thousands of invoices with tens of transactions each are created using