Re: new installations tryout problem

Thanks a lot Mike Dewhirst. I think that's issue.

Directly check the database, there is no poll record there.

My current  models.py in poll reads like

import datetime

from django.db import models

from django.utils import timezone

# Create your models here.

class Poll(models.Model):

    def __unicode__(self):

        return self.question

    question = models.CharField(max_length=200)

    pub_date = models.DateTimeField('date published')

class Question(models.Model):

    def __unicode__(self):

        return self.question_text

    def was_published_recently(self):

        return self.pub_date >= timezone.now() - datetime.timedelta(days=1)

    question_text = models.CharField(max_length=200)

    pub_date = models.DateTimeField('date published')

class Choice(models.Model):

    def __unicode__(self):

        return self.choice_text

    poll = models.ForeignKey(Poll)

    question = models.ForeignKey(Question)

    choice_text = models.CharField(max_length=200)

    votes = models.IntegerField(default=0)

And the corresponding mysql database tables are

mysql> desc polls_poll;

+----------+--------------+------+-----+---------+----------------+

| Field    | Type         | Null | Key | Default | Extra          |

+----------+--------------+------+-----+---------+----------------+

| id       | int(11)      | NO   | PRI | NULL    | auto_increment |

| question | varchar(200) | NO   |     | NULL    |                |

| pub_date | datetime     | NO   |     | NULL    |                |

+----------+--------------+------+-----+---------+----------------+

3 rows in set (0.00 sec)

mysql> desc polls_question;

+---------------+--------------+------+-----+---------+----------------+

| Field         | Type         | Null | Key | Default | Extra          |

+---------------+--------------+------+-----+---------+----------------+

| id            | int(11)      | NO   | PRI | NULL    | auto_increment |

| question_text | varchar(200) | NO   |     | NULL    |                |

| pub_date      | datetime     | NO   |     | NULL    |                |

+---------------+--------------+------+-----+---------+----------------+

3 rows in set (0.00 sec)

mysql> desc polls_choice;

+-------------+--------------+------+-----+---------+----------------+

| Field       | Type         | Null | Key | Default | Extra          |

+-------------+--------------+------+-----+---------+----------------+

| id          | int(11)      | NO   | PRI | NULL    | auto_increment |

| choice_text | varchar(200) | NO   |     | NULL    |                |

| votes       | int(11)      | NO   |     | NULL    |                |

| poll_id     | int(11)      | NO   | MUL | NULL    |                |

| question_id | int(11)      | NO   | MUL | NULL    |                |

+-------------+--------------+------+-----+---------+----------------+

5 rows in set (0.00 sec)

This tutorial doesn't ask to create poll record, and since question is not modeled related to poll, so I can create and save a question record without poll.

These seem a bit strange, but let's just create a poll record to move on.

It turns out that's not the case:

>>> q.choice_set.create(choice_text='Not much', votes=0)

Cause the exception because

(1) the statement does not contain poll_id value

(2) the statement excutes the database insertion implicitly

(3) the table polls_choice column was set not null.

My guess is that the tutorial is out of sync with the changes of django....

So what's the best doc for learning django?

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