moviewyrm/bookwyrm/views/list.py

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""" book list views"""
from typing import Optional
from urllib.parse import urlencode
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from django.contrib.auth.decorators import login_required
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from django.core.paginator import Paginator
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from django.db import IntegrityError, transaction
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from django.db.models import Avg, Count, DecimalField, Q, Max
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from django.db.models.functions import Coalesce
from django.http import HttpResponseBadRequest, HttpResponse
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from django.shortcuts import get_object_or_404, redirect
from django.template.response import TemplateResponse
from django.urls import reverse
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from django.utils.decorators import method_decorator
from django.views import View
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from django.views.decorators.http import require_POST
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from bookwyrm import forms, models
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from bookwyrm.activitypub import ActivitypubResponse
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from bookwyrm.connectors import connector_manager
from bookwyrm.settings import PAGE_LENGTH
from .helpers import is_api_request, privacy_filter
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from .helpers import get_user_from_username
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# pylint: disable=no-self-use
class Lists(View):
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"""book list page"""
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def get(self, request):
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"""display a book list"""
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# hide lists with no approved books
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lists = (
models.List.objects.annotate(
item_count=Count("listitem", filter=Q(listitem__approved=True))
)
.filter(item_count__gt=0)
.select_related("user")
.prefetch_related("listitem_set")
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.order_by("-updated_date")
.distinct()
)
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lists = privacy_filter(
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request.user, lists, privacy_levels=["public", "followers"]
)
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paginated = Paginator(lists, 12)
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data = {
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"lists": paginated.get_page(request.GET.get("page")),
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"list_form": forms.ListForm(),
"path": "/list",
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}
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return TemplateResponse(request, "lists/lists.html", data)
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@method_decorator(login_required, name="dispatch")
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# pylint: disable=unused-argument
def post(self, request):
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"""create a book_list"""
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form = forms.ListForm(request.POST)
if not form.is_valid():
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return redirect("lists")
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book_list = form.save()
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return redirect(book_list.local_path)
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@method_decorator(login_required, name="dispatch")
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class SavedLists(View):
"""saved book list page"""
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def get(self, request):
"""display book lists"""
# hide lists with no approved books
lists = request.user.saved_lists.order_by("-updated_date")
paginated = Paginator(lists, 12)
data = {
"lists": paginated.get_page(request.GET.get("page")),
"list_form": forms.ListForm(),
"path": "/list",
}
return TemplateResponse(request, "lists/lists.html", data)
@method_decorator(login_required, name="dispatch")
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class UserLists(View):
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"""a user's book list page"""
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def get(self, request, username):
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"""display a book list"""
user = get_user_from_username(request.user, username)
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lists = models.List.objects.filter(user=user)
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lists = privacy_filter(request.user, lists)
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paginated = Paginator(lists, 12)
data = {
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"user": user,
"is_self": request.user.id == user.id,
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"lists": paginated.get_page(request.GET.get("page")),
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"list_form": forms.ListForm(),
"path": user.local_path + "/lists",
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}
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return TemplateResponse(request, "user/lists.html", data)
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class List(View):
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"""book list page"""
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def get(self, request, list_id):
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"""display a book list"""
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book_list = get_object_or_404(models.List, id=list_id)
book_list.raise_visible_to_user(request.user)
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if is_api_request(request):
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return ActivitypubResponse(book_list.to_activity(**request.GET))
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query = request.GET.get("q")
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suggestions = None
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# 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"
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directional_sort_by = {
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"order": "order",
"title": "book__title",
"rating": "average_rating",
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}[sort_by]
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if direction == "descending":
directional_sort_by = "-" + directional_sort_by
items = book_list.listitem_set.prefetch_related("user", "book", "book__authors")
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if sort_by == "rating":
items = items.annotate(
average_rating=Avg(
Coalesce("book__review__rating", 0.0),
output_field=DecimalField(),
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)
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)
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items = items.filter(approved=True).order_by(directional_sort_by)
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paginated = Paginator(items, PAGE_LENGTH)
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if query and request.user.is_authenticated:
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# search for books
suggestions = connector_manager.local_search(
query,
raw=True,
filters=[~Q(parent_work__editions__in=book_list.books.all())],
)
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elif request.user.is_authenticated:
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# just suggest whatever books are nearby
suggestions = request.user.shelfbook_set.filter(
~Q(book__in=book_list.books.all())
)
suggestions = [s.book for s in suggestions[:5]]
if len(suggestions) < 5:
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suggestions += [
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s.default_edition
for s in models.Work.objects.filter(
~Q(editions__in=book_list.books.all()),
).order_by("-updated_date")
][: 5 - len(suggestions)]
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page = paginated.get_page(request.GET.get("page"))
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data = {
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"list": book_list,
"items": page,
"page_range": paginated.get_elided_page_range(
page.number, on_each_side=2, on_ends=1
),
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"pending_count": book_list.listitem_set.filter(approved=False).count(),
"suggested_books": suggestions,
"list_form": forms.ListForm(instance=book_list),
"query": query or "",
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"sort_form": forms.SortListForm(
{"direction": direction, "sort_by": sort_by}
),
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}
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return TemplateResponse(request, "lists/list.html", data)
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@method_decorator(login_required, name="dispatch")
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# pylint: disable=unused-argument
def post(self, request, list_id):
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"""edit a list"""
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book_list = get_object_or_404(models.List, id=list_id)
book_list.raise_not_editable(request.user)
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form = forms.ListForm(request.POST, instance=book_list)
if not form.is_valid():
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return redirect("list", book_list.id)
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book_list = form.save()
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return redirect(book_list.local_path)
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class Curate(View):
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"""approve or discard list suggestsions"""
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@method_decorator(login_required, name="dispatch")
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def get(self, request, list_id):
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"""display a pending list"""
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book_list = get_object_or_404(models.List, id=list_id)
book_list.raise_not_editable(request.user)
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data = {
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"list": book_list,
"pending": book_list.listitem_set.filter(approved=False),
"list_form": forms.ListForm(instance=book_list),
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}
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return TemplateResponse(request, "lists/curate.html", data)
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@method_decorator(login_required, name="dispatch")
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# pylint: disable=unused-argument
def post(self, request, list_id):
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"""edit a book_list"""
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book_list = get_object_or_404(models.List, id=list_id)
book_list.raise_not_editable(request.user)
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suggestion = get_object_or_404(models.ListItem, id=request.POST.get("item"))
approved = request.POST.get("approved") == "true"
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if approved:
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# update the book and set it to be the last in the order of approved books,
# before any pending books
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suggestion.approved = True
order_max = (
book_list.listitem_set.filter(approved=True).aggregate(Max("order"))[
"order__max"
]
or 0
) + 1
suggestion.order = order_max
increment_order_in_reverse(book_list.id, order_max)
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suggestion.save()
else:
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deleted_order = suggestion.order
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suggestion.delete(broadcast=False)
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normalize_book_list_ordering(book_list.id, start=deleted_order)
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return redirect("list-curate", book_list.id)
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@require_POST
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@login_required
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def save_list(request, list_id):
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"""save a list"""
book_list = get_object_or_404(models.List, id=list_id)
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request.user.saved_lists.add(book_list)
return redirect("list", list_id)
@require_POST
@login_required
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def unsave_list(request, list_id):
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"""unsave a list"""
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book_list = get_object_or_404(models.List, id=list_id)
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request.user.saved_lists.remove(book_list)
return redirect("list", list_id)
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@require_POST
@login_required
def delete_list(request, list_id):
"""delete a list"""
book_list = get_object_or_404(models.List, id=list_id)
# only the owner or a moderator can delete a list
book_list.raise_not_deletable(request.user)
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book_list.delete()
return redirect("lists")
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@require_POST
@login_required
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def add_book(request):
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"""put a book on a list"""
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book_list = get_object_or_404(models.List, id=request.POST.get("list"))
book_list.raise_visible_to_user(request.user)
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book = get_object_or_404(models.Edition, id=request.POST.get("book"))
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# do you have permission to add to the list?
try:
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if request.user == book_list.user or book_list.curation == "open":
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# add the book at the latest order of approved books, before pending books
order_max = (
book_list.listitem_set.filter(approved=True).aggregate(Max("order"))[
"order__max"
]
) or 0
increment_order_in_reverse(book_list.id, order_max + 1)
models.ListItem.objects.create(
book=book,
book_list=book_list,
user=request.user,
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order=order_max + 1,
)
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elif book_list.curation == "curated":
# make a pending entry at the end of the list
order_max = (
book_list.listitem_set.aggregate(Max("order"))["order__max"]
) or 0
models.ListItem.objects.create(
approved=False,
book=book,
book_list=book_list,
user=request.user,
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order=order_max + 1,
)
else:
# you can't add to this list, what were you THINKING
return HttpResponseBadRequest()
except IntegrityError:
# if the book is already on the list, don't flip out
pass
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path = reverse("list", args=[book_list.id])
params = request.GET.copy()
params["updated"] = True
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return redirect(f"{path}?{urlencode(params)}")
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@require_POST
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@login_required
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def remove_book(request, list_id):
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"""remove a book from a list"""
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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"))
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item.raise_not_deletable(request.user)
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deleted_order = item.order
item.delete()
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normalize_book_list_ordering(book_list.id, start=deleted_order)
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return redirect("list", list_id)
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@require_POST
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@login_required
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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.
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"""
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list_item = get_object_or_404(models.ListItem, id=list_item_id)
list_item.list.raise_not_editable(request.user)
try:
int_position = int(request.POST.get("position"))
except ValueError:
return HttpResponseBadRequest(
"bad value for position. should be an integer"
)
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if int_position < 1:
return HttpResponseBadRequest("position cannot be less than 1")
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book_list = list_item.book_list
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# the max position to which a book may be set is the highest order for
# books which are approved
order_max = book_list.listitem_set.filter(approved=True).aggregate(
Max("order")
)["order__max"]
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int_position = min(int_position, order_max)
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original_order = list_item.order
if original_order == int_position:
# no change
return HttpResponse(status=204)
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with transaction.atomic():
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if original_order > int_position:
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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: int, start: int, end: Optional[int] = None
):
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"""increase the order number for every item in a list"""
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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)
if end is not None:
items = items.filter(order__lt=end)
items = items.order_by("-order")
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for item in items:
item.order += 1
item.save()
@transaction.atomic
def decrement_order(book_list_id, start, end):
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"""decrement the order value for every item in a list"""
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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):
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"""gives each book in a list the proper sequential order number"""
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try:
book_list = models.List.objects.get(id=book_list_id)
except models.List.DoesNotExist:
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return
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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()