django – Page 4 – Tarik Billa

SQLAlchemy Model Django like Save Method?

January 7, 2024 by Tarik

You can extend your models with some simple crud methods to achieve something similar to Django ORM / ActiveRecord: # SQLAlchemy db_session setup omitted … Model = declarative_base(name=”Model”) Model.query = db_session.query_property() class CRUD(): def save(self): if self.id == None: db_session.add(self) return db_session.commit() def destroy(self): db_session.delete(self) return db_session.commit() class User(Model, CRUD): __tablename__ = ‘users’ id = … Read more

django.db.utils.OperationalError: fe_sendauth: no password supplied

January 6, 2024 by Tarik

If you want to use a local password less connection then you need to remove the values “HOST”, “PORT” and “PASSWORD”. With this configuration your connector will try to connect using a unix domain socket which is the only allowed password less connection allowed by default in Postgres

What is the difference between a cookie and a session in django?

January 6, 2024 by Tarik

A cookie is something that sits on the client’s browser and is merely a reference to a Session which is, by default, stored in your database. The cookie stores a random ID and doesn’t store any data itself. The session uses the value in the cookie to determine which Session from the database belongs to … Read more

Django REST Framework: using TokenAuthentication with browsable API

January 6, 2024 by Tarik

You can’t use the browsable api with TokenAuthentication. You have to add SessionAuthtication to your settings (http://www.django-rest-framework.org/api-guide/authentication/#sessionauthentication): REST_FRAMEWORK = { ‘DEFAULT_AUTHENTICATION_CLASSES’: ( ‘rest_framework.authentication.TokenAuthentication’, ‘rest_framework.authentication.SessionAuthentication’, ),

Non-database field in Django model

January 5, 2024 by Tarik

As long as you do not want the property to persist, I don’t see why you can’t create a property like you described. I actually do the same thing on certain models to determine which are editable. class Email(EntryObj): ts = models.DateTimeField(auto_now_add=True) body = models.TextField(blank=True) user = models.ForeignKey(User, blank=True, null=True) editable = False … class … Read more

What is the best way to migrate data in django

January 5, 2024 by Tarik

Another technique is to use the dumpdata and loaddata arguments to manage.py, killing your database in-between: python manage.py dumpdata > dump.json With an external tool, drop any affected tables, or kill the whole db python manage.py loaddata dump.json See manage.py docs for more.

Django, global template variables

January 5, 2024 by Tarik

Write your own context processor.

Only showing year in django admin, a YearField instead of DateField?

January 5, 2024 by Tarik

I found this solution which solves the whole thing quite elegantly I think (not my code): import datetime YEAR_CHOICES = [] for r in range(1980, (datetime.datetime.now().year+1)): YEAR_CHOICES.append((r,r)) year = models.IntegerField(_(‘year’), choices=YEAR_CHOICES, default=datetime.datetime.now().year) Edit the range start to extend the list 🙂

Access instance passed to ModelForm from clean(self) method

January 4, 2024 by Tarik

In a ModelForm, the instance is accessible via self.instance self.instance.first == self.cleaned_data.get(“second”) http://docs.djangoproject.com/en/dev/topics/forms/modelforms/#overriding-the-clean-method

comparing querysets in django TestCase

January 4, 2024 by Tarik

The queryset objects will not be identical if they are the result of different queries even if they have the same values in their result (compare ds1.query and ds2.query). If you convert the query set to a list first, you should be able to do a normal comparison (assuming they have the same sort order … Read more