There is built-in Django way to achieve what you want. Add a field to the model of “custom page” with primary_key=True and default= name of key generation function, like this: class CustomPage(models.Model): … mykey = models.CharField(max_length=6, primary_key=True, default=pkgen) … Now, for every model instance page, page.pk becomes an alias for page.mykey, which is being auto-assigned … Read more
Django does not support compound primary keys. You can create a single compound unique key with Meta.unique_together.
Try this code: Message_me = Messages.objects.filter(username=”myname”, status=0).count()
The solution by Masatsugu Hosoi works fine, but you can also use the decorator and set short_description on the property getter (fget): @property def my_property(self): return u’Returns some calculations’ my_property.fget.short_description = u’Property X’
From this answer it seems like it is possible to use ModelAdmin.formfield_overrides to override the ManyToManyField to use CheckBoxSelectMultiple: from django.db import models from django.contrib import admin from django.forms import CheckboxSelectMultiple class MyModelAdmin(admin.ModelAdmin): formfield_overrides = { models.ManyToManyField: {‘widget’: CheckboxSelectMultiple}, } I haven’t tried it and am merely quoting from the source, but it seems plausible. … Read more
For the lazy/pragmatic: class MyModel(models.Model): …other fields… content_type = models.ForeignKey(ContentType, blank=True, null=True, on_delete=models.SET_NULL) object_id = models.PositiveIntegerField(blank=True, null=True) content_object = generic.GenericForeignKey(‘content_type’, ‘object_id’)
While overwriting save() method is a valid solution. I found it useful to deal with this on a Field level as opposed to the Model level by overwriting get_prep_value() method. This way if you ever want to reuse this field in a different model, you can adopt the same consistent strategy. Also the logic is … Read more
Just use django’s safe filter. In your template you would do something like this: {{ instance.my_text_field|safe }}
What you probably want is a custom manager From the django docs: # An example of a custom manager called “objects”. class PersonManager(models.Manager): def get_fun_people(self): return self.filter(fun=True) class Person(models.Model): first_name = models.CharField(max_length=30) last_name = models.CharField(max_length=30) fun = models.BooleanField() objects = PersonManager() def __unicode__(self): return u”%s %s” % (self.first_name, self.last_name) which then allows you to do … Read more
I’m doing the same thing and noticed a nugget in the Django docs that you should think about. Overriding predefined model methods Overriding Delete Note that the delete() method for an object is not necessarily called when deleting objects in bulk using a QuerySet. To ensure customized delete logic gets executed, you can use pre_delete … Read more