如何在 MySQL 中创建模型表？

Question

I'm trying to replicate a PHP/Symfony project in Python/Django as a python learning exercise. Platform = Windows 10. The expected result is that a migrate command will add tables related to all of the entries in settings.py INSTALLED_APPS{...} . Instead, the migrate command adds all Django tables but none of the tables of models.py .

What, then, must be done to allow migrate to add the 5 MySQL tables?

Result:

mysql> use diet_py;
Database changed
mysql> show tables;
+----------------------------+
| Tables_in_diet_py          |
+----------------------------+
| auth_group                 |
| auth_group_permissions     |
| auth_permission            |
| auth_user                  |
| auth_user_groups           |
| auth_user_user_permissions |
| django_admin_log           |
| django_content_type        |
| django_migrations          |
| django_session             |
+----------------------------+

Following Django tutorial documentation, with slight modifications, I have these directories & files:

Tree:

...DB1-PROJECT
│   db.sqlite3
│   manage.py
│
├───diet
│   │   admin.py
│   │   apps.py
│   │   models.py
│   │   tests.py
│   │   views.py
│   │   __init__.py
│   │
│   ├───migrations
│   │   │   __init__.py
│   │   │
│   │   └───__pycache__
│   │           __init__.cpython-311.pyc
│   │
│   └───__pycache__
│           admin.cpython-311.pyc
│           apps.cpython-311.pyc
│           models.cpython-311.pyc
│           __init__.cpython-311.pyc
│
└───mysite
    │   asgi.py
    │   settings.py
    │   urls.py
    │   wsgi.py
    │   __init__.py
    │
    └───__pycache__
            settings.cpython-311.pyc
            urls.cpython-311.pyc
            wsgi.cpython-311.pyc
            __init__.cpython-311.pyc

..\diet\models.py

from django.db import models

# Create your models here.
from django.db import models


class Food(models.Model):
    food_name = models.CharField(max_length=255)

    class Meta:
        db_table = 'food'


class Gut(models.Model):
    description = models.CharField(max_length=255, blank=True, null=True)
    datetime = models.DateTimeField()
    reaction_id = models.IntegerField()

    class Meta:
        db_table = 'gut'


class Meal(models.Model):
    meal_type = models.CharField(max_length=255)
    date = models.DateTimeField()

    class Meta:
        db_table = 'meal'


class MealFood(models.Model):
    meal = models.OneToOneField(Meal, models.DO_NOTHING, primary_key=True)
    food = models.ForeignKey(Food, models.DO_NOTHING)

    class Meta:
        db_table = 'meal_food'
        unique_together = (('meal', 'food'),)


class Reaction(models.Model):
    reaction = models.CharField(max_length=45)

    class Meta:
        db_table = 'reaction'

...\mysite\settings.py

from pathlib import Path
import pymysql

pymysql.install_as_MySQLdb()
...
INSTALLED_APPS = [
    'diet.apps.DietConfig',
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
]
...
DATABASES = {
        'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'diet_py',
        'USER': 'username',
        'PASSWORD': 'password',
        'HOST': '127.0.0.1',
        'PORT': '3306',
    }
}
...

Answer 1

after model code finished. you need to run makemigrations command in CLI

python manage.py makemigrations

When you run this command you can see the modifications and additions that you are created in the command line some thing like following

diet/migrations/0001_initial.py
- Create model Food

if that not worked. The try the migrate command with app name as parameter like bellow

python manage.py makemigrations diet