Introduction

Here's the basics of Django's model.

settings in models.py

`models.py`


from django.db import models


class SampleModel(models.Model):
    # id = models.AutoField(primary_key=True)
    char_sample = models.CharField(max_length=200)
    char_with_null = models.CharField(max_length=10, blank=True, null=True)
    char_options = models.CharField(choices=(('one', 1), ('two', 2)))
    text_sample = models.TextField()
    bool_sample = models.BooleanField(default=False)
    datetime_created = models.DateTimeField(auto_now_add=True)
    datetime_updated = models.DateTimeField(auto_now=True)
    date_sample = models.DateField()

    def __str__(self):
        return self.char_sample

Primary key

The primary key is set automatically, even if you don't specify it. In views etc., you can refer to it in the form of pk etc.

CharField

A field for entering characters. HTML tags correspond to <input type =" text ">. max_length (maximum number of characters) must always be specified. Also, if blank = True, blank is allowed at the time of validation, and if null = True, null is allowed at the time of data registration. blank = and null = can be used in other fields as well.

TextField

This is also a field for entering characters. The HTML tag corresponds to <textarea>, and you can enter a large number of characters.

BooleanField

A field that accepts boolean values. If default = False is specified, it will be treated as False if it is not specified at the time of data registration. default = can also be used in other fields.

DateTimeField

A field for entering the date and time. If ʻauto_now_add = True, the date and time of that timing is registered only once at the beginning, and it is not updated after that. If ʻauto_now = True, the date and time of registration timing will be updated automatically.

DateField

A field for entering a date.

str () function

The last __str__ function is written to refer to the specified field as the title instead of the primary key when referencing the model on the management screen.

admin.py settings

`admin.py`


from django.contrib import admin

from .models import SampleModel


admin.site.register(SampleModel)

Add ʻadmin.site.register (model name)` to refer to the model on the management screen.

Summary

Here, we explained the model-related settings. Next time, I will explain about views.

Models in Django