moviewyrm/bookwyrm/views/list/list.py

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""" book list views"""
from typing import Optional
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from django.contrib.auth.decorators import login_required
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from django.core.exceptions import PermissionDenied
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from django.core.paginator import Paginator
from django.db import transaction
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from django.db.models import Avg, DecimalField, Q, Max
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from django.db.models.functions import Coalesce
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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 book_search, forms, models
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from bookwyrm.activitypub import ActivitypubResponse
from bookwyrm.settings import PAGE_LENGTH
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from bookwyrm.views.helpers import is_api_request
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# pylint: disable=no-self-use
class List(View):
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"""book list page"""
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def get(self, request, list_id, add_failed=False, add_succeeded=False):
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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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items = book_list.listitem_set.filter(approved=True).prefetch_related(
"user", "book", "book__authors"
)
items = sort_list(request, items)
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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 = book_search.search(
query,
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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embed_key = str(book_list.embed_key.hex)
embed_url = reverse("embed-list", args=[book_list.id, embed_key])
embed_url = request.build_absolute_uri(embed_url)
if request.GET:
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embed_url = f"{embed_url}?{request.GET.urlencode()}"
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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(request.GET),
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"embed_url": embed_url,
"add_failed": add_failed,
"add_succeeded": add_succeeded,
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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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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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# this shouldn't happen
raise Exception(form.errors)
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book_list = form.save()
if not book_list.curation == "group":
book_list.group = None
book_list.save(broadcast=False)
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return redirect(book_list.local_path)
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def sort_list(request, items):
"""helper to handle the surprisngly involved sorting"""
# 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"
directional_sort_by = {
"order": "order",
"title": "book__title",
"rating": "average_rating",
}[sort_by]
if direction == "descending":
directional_sort_by = "-" + directional_sort_by
if sort_by == "rating":
items = items.annotate(
average_rating=Avg(
Coalesce("book__review__rating", 0.0),
output_field=DecimalField(),
)
)
return items.order_by(directional_sort_by)
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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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@transaction.atomic
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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("book_list"))
# make sure the user is allowed to submit to this list
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book_list.raise_visible_to_user(request.user)
if request.user != book_list.user and book_list.curation == "closed":
raise PermissionDenied()
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is_group_member = models.GroupMember.objects.filter(
group=book_list.group, user=request.user
).exists()
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form = forms.ListItemForm(request.POST)
if not form.is_valid():
return List().get(request, book_list.id, add_failed=True)
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item = form.save(commit=False)
if 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
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item.approved = is_group_member or request.user == book_list.user
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else:
# 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)
item.order = order_max + 1
item.save()
return List().get(request, book_list.id, add_succeeded=True)
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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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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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with transaction.atomic():
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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)
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list_item.book_list.raise_not_editable(request.user)
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try:
int_position = int(request.POST.get("position"))
except ValueError:
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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
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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()