django model object create code example

Example 1: django create model from dictionary

# create instance of model
m = MyModel(**data_dict)
# don't forget to save to database!
m.save()

Example 2: django model example

from django.db import models

class myModel(models.Model):
  input1 = models.CharField(max_length=100)
  input2 = models.TextField()
  input3 - models.DateTimeField(auto_now=True)
  
  def __str__(self):
	return self.input1

Example 3: super in django manager

# First, define the Manager subclass.
class DahlBookManager(models.Manager):
    def get_queryset(self):
        return super().get_queryset().filter(author='Roald Dahl')

# Then hook it into the Book model explicitly.
class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.CharField(max_length=50)

    objects = models.Manager() # The default manager.
    dahl_objects = DahlBookManager() # The Dahl-specific manager.

Example 4: django get or create object

try:
    obj = Person.objects.get(first_name='John', last_name='Lennon')
except Person.DoesNotExist:
    obj = Person(first_name='John', last_name='Lennon', birthday=date(1940, 10, 9))
    obj.save()

Here, with concurrent requests, multiple attempts to save a Person with the same parameters may be made. To avoid this race condition, the above example can be rewritten using get_or_create() like so:

obj, created = Person.objects.get_or_create(
    first_name='John',
    last_name='Lennon',
    defaults={'birthday': date(1940, 10, 9)},
)
Any keyword arguments passed to get_or_create() — except an optional one called defaults — will be used in a get() call. If an object is found, get_or_create() returns a tuple of that object and False.

Example 5: .save() in django

>>> one_entry = Entry.objects.get(pk=1)