lingghh / django-database-view

A django pluggable that allows to work with Database views

django-database-view

A simple pluggable application that allows to work with database views.

Quick start

1. Install the package:

   pip install django-database-view
   

2. In your models.py create classes which extend dbview.models.DbView like this:

   from django.db import models
   from dbview.models import DbView
   
   class ModelA(models.Model):
       fielda = models.CharField(max_length=64)
       fieldc = models.IntegerField()
   
   class MyView(DbView):
       fieldA = models.OneToOneField(ModelA, primary_key=True,
           on_delete=models.DO_NOTHING, db_column='fielda__id')
       fieldB = models.IntegerField(blank=True, null=True, db_column='fieldb')
   
       @classmethod
       def view(cls):
           """
           This method returns the SQL string that creates the view,
           in this example fieldB is the result of annotating another column
           """
           qs = modelA.objects.all(
           ).annotate(
               fieldb=models.Sum('fieldc'),
           ).annotate(
               fielda__id=models.F('pk'),
           ).order_by(
               'fielda__id',
           ).values(
               'fielda__id',
               'fieldb',
           )
           return str(qs.query)

   Alternatively get_view_str method could be used to write a custom SQL:

   class MyView(DbView):
       # ...
   
       @classmethod
       def get_view_str(cls):
           return """
               CREATE VIEW my_view AS (
               SELECT ...
           )"""

3. Then create a migration point for your view generation, edit that migration and modify it, add: from dbview.helpers import CreateView and replace the line the call to migrations.CreateModel with CreateView.

4. Migrate your database and start using your database views.