Error using Requests to PUT task status

[clebio]

So, trying to follow along with Chapter 6, I hit the API via requests:

import requests
import datetime
response = requests.get('http://localhost:9000/api/tasks', auth=('admin', 'admin'))
tasks = response.json()
t0 = tasks['results'][0]
t0['assigned'] = 'admin'
t0['status'] = 2
today = datetime.date.today()
t0['started'] = today
response = requests.put(t0['links']['self'], data=t0, auth=('admin', 'admin'))

But when I PUT the task back, I'm met with a 400 response:

In [21]: response = requests.put(t0['links']['self'], data=t0, auth=('admin', 'admin'))
In [22]: response.text
Out[22]: u'{"non_field_errors":["Backlog tasks must have \\"Not Started\\" status."]}'

I'm also a bit confused, and perhaps this is related, about the statuses as defined in the models versus in the Backbone UI:

In [27]: from board import models
In [28]: models.Task.STATUS_TODO
Out[28]: 1

Whereas when I hit up http://localhost:9000/#sprint/1, I see five statuses:
Backlog, Not Started, In Development, In Testing, Completed

I haven't dug too far down yet, but it seems like there's a conflict in the STATUS codes:
https://github.com/lightweightdjango/examples/blob/chapter-6/scrum/board/static/board/js/views.js#L307

            this.statuses = {
                unassigned: new StatusView({
                    sprint: null, status: 1, title: 'Backlog'}),
                todo: new StatusView({
                    sprint: this.sprintId, status: 1, title: 'Not Started'}),
                active: new StatusView({
                    sprint: this.sprintId, status: 2, title: 'In Development'}),
                testing: new StatusView({
                    sprint: this.sprintId, status: 3, title: 'In Testing'}),
                done: new StatusView({
                    sprint: this.sprintId, status: 4, title: 'Completed'})
            };

versus
https://github.com/lightweightdjango/examples/blob/chapter-6/scrum/board/models.py#L20

    STATUS_TODO = 1
    STATUS_IN_PROGRESS = 2
    STATUS_TESTING = 3
    STATUS_DONE = 4

    STATUS_CHOICES = (
        (STATUS_TODO, _('Not Started')),
        (STATUS_IN_PROGRESS, _('In Progress')),
        (STATUS_TESTING, _('Testing')),
        (STATUS_DONE, _('Done')),
    )

[clebio]

Also, 👍 to the suggestion from #2 that there should be a requirements.txt for each chapter. Without a careful reading of the text, one has to sort of fumble through what pip installs are needed.

[mlavin]

"Backlog" in our model is not another status but rather denotes tasks which are not assigned to a sprint. The UI needs to display them in the sprint detail so that they can be moved into the sprint via drag and drop. In our application we've chosen to enforce that tasks which are not part of a sprint must have the status of TODO. You're seeing that enforced in the PUT call because it attempts to change the status without assigning a sprint.