reading-notes

In-Class Notes

• In the model, the way it is represented in the database can be defined with a __str__ function.

  def __str__(self):
    return self.name
  

  • This will render the name of the object as a string in the database for us to reference it and interact with it.

• TextField is used when you do not know the length of the input for a string

Setting up CRUD

• Done in models.py
• Will create a class, which will serve as your model for the data
• Will add the CRUD methods using different view templates and add them to settings.py
  • Import all template views in settings.py
• Use reverse_lazy for the success_url on the delete method
• `` needs to be used as well for security

urlpatterns = [
  path("", ThingListView.as_view(), name='thing_list'),
  path('<int:pk>/', ThingDetailView.as_view(), name='thing_detail'),
  path('create/', ThingCreateView.as_view(), name='thing_create'),
  path('<int:pk>/update/', ThingUpdateView.as_view(), name='thing_update'),
  path('<int:pk>/delete/', ThingDeleteView.as_view(), name='thing_delete'),
]

from django.db import models
from django.contrib.auth import get_user_model
from django.urls import reverse

class Thing(models.Model):
  name = models.CharField(max_length=256)
  rating = models.IntegerField(default=0)
  reviewer = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
  image_url = models.URLField(default='https://http.cat/404')
  reference_url = models.URLField(default='https://http.cat/404')
  description = models.TextField(default='')

  def __str__(self):
    return self.name

  def get_absolute_url(self):
    return reverse('thing_detail', args=[str(self.id)])

class ThingDeleteView(DeleteView):
  template_name = 'thing_delete.html'
  model = Thing
  success_url = reverse_lazy('thing_detail')

• CASCADE = delete everything associated with the removed item
• get_user_model must be imported from django.contrib.auth
  • get_user_model() is a function provided by Django that returns the user model class that is currently active in the project.
  • This function is useful because it allows you to access the user model without having to hard-code the name of the model into your code.
  • When you use get_user_model() in your code, it will automatically return the user model class that is currently in use, whether it’s the default User model or a custom model specified in the AUTH_USER_MODEL setting.
  • This allows you to write more flexible code that can be used with different user models without modification.
• Once you create something in ADMIN view, you’ll need a function that tells the browser where to go after creating a new item
  • See get_absolute_url function we created above