need help - following django tutorial to create polls database - missing "on delete cascade" - using django 2.2.1 with mysql 8.0

Hi, everyone,

This is my first time using Django and I think I'm missing something or there is a bug. I am following the instructions on (https://docs.djangoproject.com/en/2.2/intro/tutorial02/) and I've just added the following chunk of code to "polls/models.py". (I copied/pasted so I know it's correct.)

<quote>

from django.db import models


class Question(models.Model):
    question_text = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')


class Choice(models.Model):
    question = models.ForeignKey(Question, on_delete=models.CASCADE)
    choice_text = models.CharField(max_length=200)
    votes = models.IntegerField(default=0)

</quote>

Then I ran the following command:

<quote>

LITTLEBLACK:www samktan$ python3 manage.py makemigrations polls
Migrations for 'polls':
  polls/migrations/0001_initial.py
    - Create model Question
    - Create model Choice

</quote>

Which is missing one line compared to the tutorial:

    - Add field question to choice

Now when I run this command:

<quote>

LITTLEBLACK:www samktan$ python3 manage.py sqlmigrate polls 0001

BEGIN;
--
-- Create model Question
--
CREATE TABLE `polls_question` (`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `question_text` varchar(200) NOT NULL, `pub_date` datetime(6) NOT NULL);
--
-- Create model Choice
--
CREATE TABLE `polls_choice` (`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `choice_text` varchar(200) NOT NULL, `votes` integer NOT NULL, `question_id` integer NOT NULL);
ALTER TABLE `polls_choice` ADD CONSTRAINT `polls_choice_question_id_c5b4b260_fk_polls_question_id` FOREIGN KEY (`question_id`) REFERENCES `polls_question` (`id`);
COMMIT;

</quote>

It is missing the "on delete cascade" clause, which I suspect it caused by the missing line above.

I have confirmed in MySQL that the "on delete cascade" clause is definitely missing.

<quote>

mysql> show create table `polls_choice`;
+--------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table        | Create Table                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
+--------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| polls_choice | CREATE TABLE `polls_choice` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `choice_text` varchar(200) COLLATE utf8mb4_general_ci NOT NULL,
  `votes` int(11) NOT NULL,
  `question_id` int(11) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `polls_choice_question_id_c5b4b260_fk_polls_question_id` (`question_id`),
  CONSTRAINT `polls_choice_question_id_c5b4b260_fk_polls_question_id` FOREIGN KEY (`question_id`) REFERENCES `polls_question` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci |
+--------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

</quote>

Can someone tell me what I'm doing wrong?

--

/ per ardua ad astra /

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