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584 sorting of lists

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This commit is contained in:
Pablo Barton 2021-04-08 12:05:21 -04:00
parent 797c3a12c8
commit f6824268ed
14 changed files with 2048 additions and 293 deletions
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19
bookwyrm/forms.py
View file

@ -3,7 +3,7 @@ import datetime
from collections import defaultdict
from django import forms
from django.forms import ModelForm, PasswordInput, widgets
from django.forms import ModelForm, PasswordInput, widgets, ChoiceField
from django.forms.widgets import Textarea
from django.utils import timezone
from django.utils.translation import gettext_lazy as _
@ -287,3 +287,20 @@ class ServerForm(CustomForm):
class Meta:
model = models.FederatedServer
exclude = ["remote_id"]
class SortListForm(forms.Form):
sort_by = ChoiceField(
choices=(
("order", _("List Order")),
("title", _("Book Title")),
("rating", _("Rating")),
),
label=_("Sort By"),
)
direction = ChoiceField(
choices=(
("ascending", _("Ascending")),
("descending", _("Descending")),
),
)

30
bookwyrm/migrations/0067_denullify_list_item_order.py Normal file
View file

@ -0,0 +1,30 @@
from django.db import migrations
def forwards_func(apps, schema_editor):
# Set all values for ListItem.order
BookList = apps.get_model("bookwyrm", "List")
db_alias = schema_editor.connection.alias
for book_list in BookList.objects.using(db_alias).all():
for i, item in enumerate(book_list.listitem_set.order_by("id"), 1):
item.order = i
item.save()
def reverse_func(apps, schema_editor):
# null all values for ListItem.order
BookList = apps.get_model("bookwyrm", "List")
db_alias = schema_editor.connection.alias
for book_list in BookList.objects.using(db_alias).all():
for item in book_list.listitem_set.order_by("id"):
item.order = None
item.save()
class Migration(migrations.Migration):
dependencies = [
("bookwyrm", "0066_user_deactivation_reason"),
]
operations = [migrations.RunPython(forwards_func, reverse_func)]

23
bookwyrm/migrations/0068_ordering_for_list_items.py Normal file
View file

@ -0,0 +1,23 @@
# Generated by Django 3.1.6 on 2021-04-08 16:15
import bookwyrm.models.fields
from django.db import migrations
class Migration(migrations.Migration):
dependencies = [
("bookwyrm", "0067_denullify_list_item_order"),
]
operations = [
migrations.AlterField(
model_name="listitem",
name="order",
field=bookwyrm.models.fields.IntegerField(),
),
migrations.AlterUniqueTogether(
name="listitem",
unique_together={("order", "book_list"), ("book", "book_list")},
),
]

8
bookwyrm/models/list.py
View file

@ -67,7 +67,7 @@ class ListItem(CollectionItemMixin, BookWyrmModel):
)
notes = fields.TextField(blank=True, null=True)
approved = models.BooleanField(default=True)
order = fields.IntegerField(blank=True, null=True)
order = fields.IntegerField()
endorsement = models.ManyToManyField("User", related_name="endorsers")
activity_serializer = activitypub.ListItem
@ -93,7 +93,7 @@ class ListItem(CollectionItemMixin, BookWyrmModel):
)
class Meta:
""" an opinionated constraint! you can't put a book on a list twice """
unique_together = ("book", "book_list")
# A book may only be placed into a list once, and each order in the list may be used only
# once
unique_together = (("book", "book_list"), ("order", "book_list"))
ordering = ("-created_date",)

35
bookwyrm/templates/lists/list.html
View file

@ -13,10 +13,11 @@
<div class="columns mt-3">
<section class="column is-three-quarters">
{% if not items.exists %}
{% include "snippets/booklist-pagination.html" with page=items %}
{% if not items.object_list.exists %}
<p>{% trans "This list is currently empty" %}</p>
{% else %}
<ol>
<ol start="{{ items.start_index }}">
{% for item in items %}
<li class="block pb-3">
<div class="card">
@ -40,6 +41,16 @@
<input type="hidden" name="item" value="{{ item.id }}">
<button type="submit" class="button is-small is-danger">{% trans "Remove" %}</button>
</form>
</div>
<div class="card-footer has-background-white-bis">
<div>
<form name="set-position" method="post" action="{% url 'list-set-book-position' item.id %}" class="card-footer-item">
{% csrf_token %}
<label for="input-list-position" class="is-sr-only">{% trans "List position" %}</label>
<input id="input-list-position" class="input" type="number" min="1" name="position" value="{{ item.order }}">
<button type="submit" class="button is-small is-info">{% trans "List position" %}</button>
</form>
</div>
{% endif %}
</div>
</div>
@ -49,8 +60,24 @@
{% endif %}
</section>
{% if request.user.is_authenticated and not list.curation == 'closed' or request.user == list.user %}
<section class="column is-one-quarter content">
<h2>{% trans "Sort List" %}</h2>
<form name="sort" action="{% url 'list' list.id %}" method="GET" class="block">
<label class="label" for="id_sort_by">{% trans "Sort By" %}</label>
<div class="select is-fullwidth">
{{ sort_form.sort_by }}
</div>
<label class="label" for="id_direction">{% trans "Direction" %}</label>
<div class="select is-fullwidth">
{{ sort_form.direction }}
</div>
<div>
<button class="button is-primary is-fullwidth" type="submit">
{% trans "Sort List" %}
</button>
</div>
</form>
{% if request.user.is_authenticated and not list.curation == 'closed' or request.user == list.user %}
<h2>{% if list.curation == 'open' or request.user == list.user %}{% trans "Add Books" %}{% else %}{% trans "Suggest Books" %}{% endif %}</h2>
<form name="search" action="{% url 'list' list.id %}" method="GET" class="block">
<div class="field has-addons">
@ -93,7 +120,7 @@
</div>
{% endif %}
{% endfor %}
</section>
{% endif %}
</section>
</div>
{% endblock %}

58
bookwyrm/templates/snippets/booklist-pagination.html Normal file
View file

@ -0,0 +1,58 @@
{% load i18n %}
{% if page.has_other_pages %}
<nav class="pagination is-small" aria-label="pagination">
<a
class="pagination-previous {% if not page.has_previous %}is-disabled{% endif %}"
{% if page.has_previous %}
href="{{ path }}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.previous_page_number }}{{ anchor }}"
{% else %}
aria-hidden="true"
{% endif %}>
<span class="icon icon-arrow-left" aria-hidden="true"></span>
{% trans "Previous" %}
</a>
<a
class="pagination-next {% if not page.has_next %}is-disabled{% endif %}"
{% if page.has_next %}
href="{{ path }}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.next_page_number }}{{ anchor }}"
{% else %}
aria-hidden="true"
{% endif %}>
{% trans "Next" %}
<span class="icon icon-arrow-right" aria-hidden="true"></span>
</a>
<ul class="pagination-list">
{% if page.number == 2 %}
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.previous_page_number }}{{ anchor }}">{{ page.previous_page_number }}</a>
{% elif page.number == 3 %}
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.previous_page_number|add:-1 }}{{ anchor }}">{{ page.previous_page_number|add:-1 }}</a>
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.previous_page_number }}{{ anchor }}">{{ page.previous_page_number }}</a>
{% elif page.number == 4 %}
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.previous_page_number|add:-2 }}{{ anchor }}">{{ page.previous_page_number|add:-2 }}</a>
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.previous_page_number|add:-1 }}{{ anchor }}">{{ page.previous_page_number|add:-1 }}</a>
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.previous_page_number }}{{ anchor }}">{{ page.previous_page_number }}</a>
{% elif page.number > 4 %}
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page=1{{ anchor }}">1</a>
<span class="pagination-ellipsis">&hellip;</span>
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.previous_page_number }}{{ anchor }}">{{ page.previous_page_number }}</a>
{% endif %}
<a class="pagination-link is-link" disabled href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.number }}{{ anchor }}">{{ page.number }}</a>
{% if page.number|add:1 == page.paginator.num_pages %}
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.next_page_number }}{{ anchor }}">{{ page.next_page_number }}</a>
{% elif page.number|add:2 == page.paginator.num_pages %}
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.next_page_number }}{{ anchor }}">{{ page.next_page_number }}</a>
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.next_page_number|add:1 }}{{ anchor }}">{{ page.next_page_number|add:1 }}</a>
{% elif page.number|add:3 == page.paginator.num_pages %}
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.next_page_number }}{{ anchor }}">{{ page.next_page_number }}</a>
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.next_page_number|add:1 }}{{ anchor }}">{{ page.next_page_number|add:1 }}</a>
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.next_page_number|add:2 }}{{ anchor }}">{{ page.next_page_number|add:2 }}</a>
{% elif page.number|add:3 < page.paginator.num_pages %}
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ page.next_page_number }}{{ anchor }}">{{ page.next_page_number }}</a>
<span class="pagination-ellipsis">&hellip;</span>
<a class="pagination-link" href="{% url 'list' list.id %}?{% for k, v in request.GET.items %}{% if k != 'page' %}{{ k }}={{ v }}&{% endif %}{% endfor %}page={{ items.paginator.num_pages }}{{ anchor }}">{{ items.paginator.num_pages }}</a>
{% endif %}
</ul>
</nav>
{% endif %}

7
bookwyrm/tests/models/test_list.py
View file

@ -51,6 +51,7 @@ class List(TestCase):
book_list=book_list,
book=self.book,
user=self.local_user,
order=1,
)
self.assertTrue(item.approved)
@ -65,7 +66,11 @@ class List(TestCase):
)
item = models.ListItem.objects.create(
book_list=book_list, book=self.book, user=self.local_user, approved=False
book_list=book_list,
book=self.book,
user=self.local_user,
approved=False,
order=1,
)
self.assertFalse(item.approved)

1
bookwyrm/tests/views/inbox/test_inbox_add.py
View file

@ -94,6 +94,7 @@ class InboxAdd(TestCase):
"type": "ListItem",
"book": self.book.remote_id,
"id": "https://bookwyrm.social/listbook/6189",
"order": 1,
},
"target": "https://bookwyrm.social/user/mouse/list/to-read",
"@context": "https://www.w3.org/ns/activitystreams",

1
bookwyrm/tests/views/inbox/test_inbox_remove.py
View file

@ -80,6 +80,7 @@ class InboxRemove(TestCase):
user=self.local_user,
book=self.book,
book_list=booklist,
order=1,
)
self.assertEqual(booklist.books.count(), 1)

158
bookwyrm/tests/views/test_list.py
View file

@ -39,6 +39,18 @@ class ListViews(TestCase):
remote_id="https://example.com/book/1",
parent_work=work,
)
work_two = models.Work.objects.create(title="Labori")
self.book_two = models.Edition.objects.create(
title="Example Edition 2",
remote_id="https://example.com/book/2",
parent_work=work_two,
)
work_three = models.Work.objects.create(title="Trabajar")
self.book_three = models.Edition.objects.create(
title="Example Edition 3",
remote_id="https://example.com/book/3",
parent_work=work_three,
)
with patch("bookwyrm.models.activitypub_mixin.broadcast_task.delay"):
self.list = models.List.objects.create(
name="Test List", user=self.local_user
@ -194,6 +206,7 @@ class ListViews(TestCase):
user=self.local_user,
book=self.book,
approved=False,
order=1,
)
request = self.factory.post(
@ -228,6 +241,7 @@ class ListViews(TestCase):
user=self.local_user,
book=self.book,
approved=False,
order=1,
)
request = self.factory.post(
@ -268,6 +282,145 @@ class ListViews(TestCase):
self.assertEqual(item.user, self.local_user)
self.assertTrue(item.approved)
def test_add_two_books(self):
"""
Putting two books on the list. The first should have an order value of
1 and the second should have an order value of 2.
"""
request_one = self.factory.post(
"",
{
"book": self.book.id,
"list": self.list.id,
},
)
request_one.user = self.local_user
request_two = self.factory.post(
"",
{
"book": self.book_two.id,
"list": self.list.id,
},
)
request_two.user = self.local_user
views.list.add_book(request_one)
views.list.add_book(request_two)
items = self.list.listitem_set.order_by("order").all()
self.assertEqual(items[0].book, self.book)
self.assertEqual(items[1].book, self.book_two)
self.assertEqual(items[0].order, 1)
self.assertEqual(items[1].order, 2)
def test_add_three_books_and_remove_second(self):
"""
Put three books on a list and then remove the one in the middle. The
ordering of the list should adjust to not have a gap.
"""
request_one = self.factory.post(
"",
{
"book": self.book.id,
"list": self.list.id,
},
)
request_one.user = self.local_user
request_two = self.factory.post(
"",
{
"book": self.book_two.id,
"list": self.list.id,
},
)
request_two.user = self.local_user
request_three = self.factory.post(
"",
{
"book": self.book_three.id,
"list": self.list.id,
},
)
request_three.user = self.local_user
views.list.add_book(request_one)
views.list.add_book(request_two)
views.list.add_book(request_three)
items = self.list.listitem_set.order_by("order").all()
self.assertEqual(items[0].book, self.book)
self.assertEqual(items[1].book, self.book_two)
self.assertEqual(items[2].book, self.book_three)
self.assertEqual(items[0].order, 1)
self.assertEqual(items[1].order, 2)
self.assertEqual(items[2].order, 3)
remove_request = self.factory.post("", {"item": items[1].id})
remove_request.user = self.local_user
views.list.remove_book(remove_request, self.list.id)
items = self.list.listitem_set.order_by("order").all()
self.assertEqual(items[0].book, self.book)
self.assertEqual(items[1].book, self.book_three)
self.assertEqual(items[0].order, 1)
self.assertEqual(items[1].order, 2)
def test_add_three_books_and_move_last_to_first(self):
"""
Put three books on the list and move the last book to the first
position.
"""
request_one = self.factory.post(
"",
{
"book": self.book.id,
"list": self.list.id,
},
)
request_one.user = self.local_user
request_two = self.factory.post(
"",
{
"book": self.book_two.id,
"list": self.list.id,
},
)
request_two.user = self.local_user
request_three = self.factory.post(
"",
{
"book": self.book_three.id,
"list": self.list.id,
},
)
request_three.user = self.local_user
views.list.add_book(request_one)
views.list.add_book(request_two)
views.list.add_book(request_three)
items = self.list.listitem_set.order_by("order").all()
self.assertEqual(items[0].book, self.book)
self.assertEqual(items[1].book, self.book_two)
self.assertEqual(items[2].book, self.book_three)
self.assertEqual(items[0].order, 1)
self.assertEqual(items[1].order, 2)
self.assertEqual(items[2].order, 3)
set_position_request = self.factory.post("", {"position": 1})
set_position_request.user = self.local_user
views.list.set_book_position(set_position_request, items[2].id)
items = self.list.listitem_set.order_by("order").all()
self.assertEqual(items[0].book, self.book_three)
self.assertEqual(items[1].book, self.book)
self.assertEqual(items[2].book, self.book_two)
self.assertEqual(items[0].order, 1)
self.assertEqual(items[1].order, 2)
self.assertEqual(items[2].order, 3)
def test_add_book_outsider(self):
""" put a book on a list """
self.list.curation = "open"
@ -358,6 +511,7 @@ class ListViews(TestCase):
book_list=self.list,
user=self.local_user,
book=self.book,
order=1,
)
self.assertTrue(self.list.listitem_set.exists())
@ -377,9 +531,7 @@ class ListViews(TestCase):
""" take an item off a list """
with patch("bookwyrm.models.activitypub_mixin.broadcast_task.delay"):
item = models.ListItem.objects.create(
book_list=self.list,
user=self.local_user,
book=self.book,
book_list=self.list, user=self.local_user, book=self.book, order=1
)
self.assertTrue(self.list.listitem_set.exists())
request = self.factory.post(

5
bookwyrm/urls.py
View file

@ -184,6 +184,11 @@ urlpatterns = [
views.list.remove_book,
name="list-remove-book",
),
re_path(
r"^list-item/(?P<list_item_id>\d+)/set-position$",
views.list.set_book_position,
name="list-set-book-position",
),
re_path(
r"^list/(?P<list_id>\d+)/curate/?$", views.Curate.as_view(), name="list-curate"
),

156
bookwyrm/views/list.py
View file

@ -1,8 +1,9 @@
""" book list views"""
from django.contrib.auth.decorators import login_required
from django.core.paginator import Paginator
from django.db import IntegrityError
from django.db.models import Count, Q
from django.db import IntegrityError, transaction
from django.db.models import Avg, Count, Q, Max
from django.db.models.functions import Coalesce
from django.http import HttpResponseNotFound, HttpResponseBadRequest
from django.shortcuts import get_object_or_404, redirect
from django.template.response import TemplateResponse
@ -16,6 +17,7 @@ from bookwyrm.connectors import connector_manager
from .helpers import is_api_request, privacy_filter
from .helpers import get_user_from_username
# pylint: disable=no-self-use
class Lists(View):
""" book list page """
@ -35,7 +37,6 @@ class Lists(View):
.filter(item_count__gt=0)
.order_by("-updated_date")
.distinct()
.all()
)
lists = privacy_filter(
@ -100,6 +101,43 @@ class List(View):
query = request.GET.get("q")
suggestions = None
# sort_by shall be "order" unless a valid alternative is given
sort_by = request.GET.get("sort_by", "order")
if sort_by not in ("order", "title", "rating"):
sort_by = "order"
# direction shall be "ascending" unless a valid alternative is given
direction = request.GET.get("direction", "ascending")
if direction not in ("ascending", "descending"):
direction = "ascending"
page = request.GET.get("page", 1)
if sort_by == "order":
directional_sort_by = "order"
if direction == "descending":
directional_sort_by = "-" + directional_sort_by
items = book_list.listitem_set.filter(approved=True).order_by(
directional_sort_by
)
elif sort_by == "title":
directional_sort_by = "book__title"
if direction == "descending":
directional_sort_by = "-" + directional_sort_by
items = book_list.listitem_set.filter(approved=True).order_by(
directional_sort_by
)
elif sort_by == "rating":
directional_sort_by = "average_rating"
if direction == "descending":
directional_sort_by = "-" + directional_sort_by
items = book_list.listitem_set.annotate(
average_rating=Avg(Coalesce("book__review__rating", 0))
).order_by(directional_sort_by)
paginated = Paginator(items, 25)
if query and request.user.is_authenticated:
# search for books
suggestions = connector_manager.local_search(query, raw=True)
@ -119,11 +157,14 @@ class List(View):
data = {
"list": book_list,
"items": book_list.listitem_set.filter(approved=True),
"items": paginated.get_page(page),
"pending_count": book_list.listitem_set.filter(approved=False).count(),
"suggested_books": suggestions,
"list_form": forms.ListForm(instance=book_list),
"query": query or "",
"sort_form": forms.SortListForm(
{"direction": direction, "sort_by": sort_by}
),
}
return TemplateResponse(request, "lists/list.html", data)
@ -168,7 +209,9 @@ class Curate(View):
suggestion.approved = True
suggestion.save()
else:
deleted_order = suggestion.order
suggestion.delete(broadcast=False)
normalize_book_list_ordering(book_list.id, start=deleted_order)
return redirect("list-curate", book_list.id)
@ -179,6 +222,8 @@ def add_book(request):
if not book_list.visible_to_user(request.user):
return HttpResponseNotFound()
order_max = book_list.listitem_set.aggregate(Max("order"))["order__max"] or 0
book = get_object_or_404(models.Edition, id=request.POST.get("book"))
# do you have permission to add to the list?
try:
@ -188,6 +233,7 @@ def add_book(request):
book=book,
book_list=book_list,
user=request.user,
order=order_max + 1,
)
elif book_list.curation == "curated":
# make a pending entry
@ -196,6 +242,7 @@ def add_book(request):
book=book,
book_list=book_list,
user=request.user,
order=order_max + 1,
)
else:
# you can't add to this list, what were you THINKING
@ -209,12 +256,101 @@ def add_book(request):
@require_POST
def remove_book(request, list_id):
""" put a book on a list """
book_list = get_object_or_404(models.List, id=list_id)
item = get_object_or_404(models.ListItem, id=request.POST.get("item"))
""" remove a book from a list """
with transaction.atomic():
book_list = get_object_or_404(models.List, id=list_id)
item = get_object_or_404(models.ListItem, id=request.POST.get("item"))
if not book_list.user == request.user and not item.user == request.user:
return HttpResponseNotFound()
if not book_list.user == request.user and not item.user == request.user:
return HttpResponseNotFound()
item.delete()
deleted_order = item.order
item.delete()
normalize_book_list_ordering(book_list.id, start=deleted_order)
return redirect("list", list_id)
@require_POST
def set_book_position(request, list_item_id):
"""
Action for when the list user manually specifies a list position, takes special care with the unique ordering per list
"""
with transaction.atomic():
list_item = get_object_or_404(models.ListItem, id=list_item_id)
try:
int_position = int(request.POST.get("position"))
except ValueError:
return HttpResponseBadRequest(
"bad value for position. should be an integer"
)
if int_position < 1:
return HttpResponseBadRequest("position cannot be less than 1")
book_list = list_item.book_list
order_max = book_list.listitem_set.aggregate(Max("order"))["order__max"]
if int_position > order_max:
int_position = order_max
if request.user not in (book_list.user, list_item.user):
return HttpResponseNotFound()
original_order = list_item.order
if original_order == int_position:
return
elif original_order > int_position:
list_item.order = -1
list_item.save()
increment_order_in_reverse(book_list.id, int_position, original_order)
else:
list_item.order = -1
list_item.save()
decrement_order(book_list.id, original_order, int_position)
list_item.order = int_position
list_item.save()
return redirect("list", book_list.id)
@transaction.atomic
def increment_order_in_reverse(book_list_id, start, end):
try:
book_list = models.List.objects.get(id=book_list_id)
except models.List.DoesNotExist:
return
items = book_list.listitem_set.filter(order__gte=start, order__lt=end).order_by(
"-order"
)
for item in items:
item.order += 1
item.save()
@transaction.atomic
def decrement_order(book_list_id, start, end):
try:
book_list = models.List.objects.get(id=book_list_id)
except models.List.DoesNotExist:
return
items = book_list.listitem_set.filter(order__gt=start, order__lte=end).order_by(
"order"
)
for item in items:
item.order -= 1
item.save()
@transaction.atomic
def normalize_book_list_ordering(book_list_id, start=0, add_offset=0):
try:
book_list = models.List.objects.get(id=book_list_id)
except models.List.DoesNotExist:
return
items = book_list.listitem_set.filter(order__gt=start).order_by("order")
for i, item in enumerate(items, start):
effective_order = i + add_offset
if item.order != effective_order:
item.order = effective_order
item.save()

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