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Readings: Django Models

Model

A model is the single, definitive source of information about your data. It contains the essential fields and behaviors of the data you’re storing. Generally, each model maps to a single database table.

The basics of Models

Each model is a Python class that subclasses django.db.models.Model.
Each attribute of the model represents a database field.
With all of this, Django gives you an automatically-generated database-access AP

Fields:

The most important part of a model – and the only required part of a model – is the list of database fields it defines. Fields are specified by class attributes.

Feilds type:

CharField is used to define short-to-mid sized fixed-length strings.
TextField is used for large arbitrary-length strings.
IntegerField is a field for storing integer (whole number) values, and for validating entered values as integers in forms.
DateField and DateTimeField are used for storing/representing dates and date/time information.
EmailField is used to store and validate email addresses.
FileField and ImageField are used to upload files and images respectively.
AutoField is a special type of IntegerField that automatically increments.
ForeignKey is used to specify a one-to-many relationship to another database model
ManyToManyField is used to specify a many-to-many relationship

model example:

from django.db import models

class MyModelName(models.Model):
    """A typical class defining a model, derived from the Model class."""

    # Fields
    my_field_name = models.CharField(max_length=20, help_text='Enter field documentation')

Django admin site

he Django admin application can use your models to automatically build a site area that you can use to create, view, update, and delete records. This can save you a lot of time during development, making it very easy to test your models and get a feel for whether you have the right data.

Registering models :

on admin.py page :

from .models import your_model

admin.site.register(your_model)

Creating a superuser:

from terminal :

    python3 manage.py createsuperuser

Logging in and using the site

To login to the site, open the /admin URL (e.g. http://127.0.0.1:8000/admin and enter your name and password that you used them to register as a superuser.
to add data to the model click add and fill the fields
to save the data in the database click save

changing the default names of the new data object:

to change the default name use str majic method in the model to return different value