from django.urls import re_path
from django.contrib import admin
from django.db.models import Count
from django.http import HttpResponseRedirect
from django.urls import reverse
from django.utils.html import format_html
from django.utils.safestring import mark_safe
from import_export import fields, resources
from import_export.admin import ExportActionMixin, ExportMixin
from parasolr.django import SolrClient
from ppa.archive.models import (
Cluster,
Collection,
DigitizedWork,
ProtectedWorkFieldFlags,
)
from ppa.archive.views import ImportView
from ppa.archive.templatetags.ppa_tags import hathi_page_url, gale_page_url
# import/export resource
[docs]
class DigitizedWorkResource(resources.ModelResource):
# declare export fields to customize output
# - get display value for choice fields
item_type = fields.Field(
attribute="get_item_type_display",
)
source = fields.Field(
attribute="get_source_display",
)
status = fields.Field(
attribute="get_status_display",
)
class Meta:
model = DigitizedWork
exclude = ("protected_fields",)
export_order = (
"id",
"source_id",
"record_id",
"title",
"subtitle",
"sort_title",
"author",
"item_type", # display
"book_journal",
"pub_date",
"pub_place",
"publisher",
"enumcron",
"collections", # multiple, names
"cluster",
"public_notes",
"notes",
"pages_orig",
"pages_digital",
"page_count",
"status",
"source",
"added",
"updated",
)
widgets = {
# customize many-to-many output for collections
"collections": {"separator": "; ", "field": "name"},
# output cluster id instead of pk
"cluster": {"field": "cluster_id"},
}
[docs]
def get_queryset(self):
# prefetch related object to make download more efficient
return super().get_queryset().prefetch_related("collections", "cluster")
[docs]
class DigitizedWorkAdmin(ExportActionMixin, ExportMixin, admin.ModelAdmin):
resource_class = DigitizedWorkResource # resource for export
# enable "save as new" button to copy and create a new record
save_as = True
list_display = (
"display_title",
"subtitle",
"source_link",
"record_id",
"cluster",
"author",
"item_type",
"list_collections",
"enumcron",
"pub_place",
"publisher",
"pub_date",
"is_public",
"added",
"updated",
)
fields = (
("source", "source_id"),
"source_url",
"item_type",
"title",
"subtitle",
"sort_title",
"enumcron",
"author",
"book_journal",
("pages_orig", "pages_digital"),
"pub_place",
"publisher",
"pub_date",
"page_count",
"public_notes",
"notes",
"record_id",
"collections",
"cluster",
"protected_fields",
"status",
"added",
"updated",
)
# fields that are always read only
readonly_fields = ("added", "updated", "protected_fields")
# fields that are read only for HathiTrust records
hathi_readonly_fields = (
"source",
"source_id",
"source_url",
"page_count",
"record_id",
)
search_fields = (
"source_id",
"title",
"subtitle",
"author",
"enumcron",
"pub_date",
"publisher",
"public_notes",
"notes",
"record_id",
"cluster__cluster_id",
)
filter_horizontal = ("collections",)
autocomplete_fields = ["cluster"]
# date_hierarchy = 'added' # is this useful?
list_filter = ["collections", "status", "source", "item_type", "cluster"]
actions = ["add_works_to_collection", "suppress_works"]
[docs]
def get_readonly_fields(self, request, obj=None):
"""
Determine read only fields based on item source, to prevent
editing of HathiTrust fields that should not be changed.
"""
if obj and obj.source == DigitizedWork.HATHI:
return self.hathi_readonly_fields + self.readonly_fields
if request.POST.get("_saveasnew"):
# protected fields must not be read-only in order
# to preserve/copy when saving as new
return ("added", "updated")
return self.readonly_fields
[docs]
def list_collections(self, obj):
"""Return a list of :class:ppa.archive.models.Collection object names
as a comma separated list to populate a change_list column.
"""
return ", ".join([coll.name for coll in obj.collections.all().order_by("name")])
list_collections.short_description = "Collections"
[docs]
def source_link(self, obj):
"""source id as an html link to source record, when source url is available"""
if not obj.source_url:
return obj.source_id
source_url = obj.source_url
# hathi/gale excerpt links should include first page
if obj.pages_digital:
if obj.source == DigitizedWork.HATHI:
# hathi page url method requires source id
source_url = hathi_page_url(obj.source_id, obj.first_page_digital())
if obj.source == DigitizedWork.GALE:
# gale page url method requires source url
source_url = gale_page_url(obj.source_url, obj.first_page_digital())
return mark_safe(
'<a href="%s" target="_blank">%s</a>' % (source_url, obj.source_id)
)
source_link.short_description = "Source id"
source_link.admin_order_field = "source_id"
def change_view(self, request, object_id, form_url="", extra_context=None):
# customize behavior when copying a record and saving as new
if request.POST.get("_saveasnew"):
# if source is unset, this means we are loading the "save as new"
# form for a hathitrust record
if not request.POST.get("source"):
# customize save as new field contents
instance = DigitizedWork.objects.get(pk=object_id)
# make a copy of the querydict so we can update it
post_params = request.POST.copy()
# read-only fields should be preserved
post_params["source"] = instance.source
post_params["source_id"] = instance.source_id
post_params["source_url"] = instance.source_url
post_params["record_id"] = instance.record_id
# copy protected wield flags in simple string format
post_params[
"protected_fields"
] = instance.protected_fields.to_simple_str()
# clear out fields that should be changed when excerpting
clear_fields = [
"title",
"sort_title",
"author",
"pages_orig",
"pages_digital",
# "page_count", # read-only, does not automatically propagate
"notes",
"public_notes",
"collections",
"cluster",
]
for field in clear_fields:
try:
del post_params[field]
except KeyError:
pass
# update request with our modified post parameters
request.POST = post_params
return super().change_view(
request,
object_id,
form_url,
extra_context=extra_context,
)
[docs]
def save_model(self, request, obj, form, change):
"""Note any fields in the protected list that have been changed in
the admin and preserve in database."""
# If new object, created from scratch, nothing to track and preserve
# or if item is not a HathiTrust item, save and return
if not change or obj.source != DigitizedWork.HATHI:
super().save_model(request, obj, form, change)
return
# has_changes only works for objects that have been changed on their
# instance -- obj is a new instance *not* a modified one,
# so compare against database
db_obj = DigitizedWork.objects.get(pk=obj.pk)
changed_fields = obj.compare_protected_fields(db_obj)
# iterate over changed fields and 'append' (OR) to flags
for field in changed_fields:
obj.protected_fields = obj.protected_fields | ProtectedWorkFieldFlags(field)
super().save_model(request, obj, form, change)
[docs]
def add_works_to_collection(self, request, queryset):
"""
Bulk add a queryset of :class:`ppa.archive.DigitizedWork` to
a :class:`ppa.archive.Collection`.
"""
# Uses POST from admin rather than a database query to get the pks
# per the suggested practices in Django documentation
selected = list(queryset.order_by("id").values_list("id", flat=True))
# encode the filter querystring so that the bulk add view can return
# the user to the same admin list view upon completion.
request.session["collection-add-filters"] = request.GET
request.session["collection-add-ids"] = selected
return HttpResponseRedirect(reverse("archive:add-to-collection"))
add_works_to_collection.short_description = (
"Add selected digitized works to collections"
)
add_works_to_collection.allowed_permissions = ("change",)
[docs]
def suppress_works(self, request, queryset):
"""Set status to suppressed for every item in the queryset
that is not already suppressed."""
non_suppressed = queryset.exclude(status=DigitizedWork.SUPPRESSED)
# save the list of ids being suppressed to update the index after
ids_to_suppress = list(non_suppressed.values_list("source_id", flat=True))
# change status in the database
updated = non_suppressed.update(status=DigitizedWork.SUPPRESSED)
# queryset.update does not trigger save signals;
# clear suppressed page + work content from the index
# delete all pages and works associated with any of these source ids
if ids_to_suppress:
solr = SolrClient()
solr.update.delete_by_query(
"source_id:(%s)"
% " OR ".join(['"%s"' % val for val in ids_to_suppress])
)
# report on what was done, including any skipped
skipped = ""
qs_total = queryset.count()
if qs_total != updated:
skipped = " Skipped %d (already suppressed)." % (qs_total - updated)
self.message_user(
request,
"Suppressed %d digitized work%s.%s"
% (updated, "" if updated == 1 else "s", skipped),
)
suppress_works.short_description = "Suppress selected digitized works"
[docs]
def get_urls(self):
"""Add url for import admin form"""
urls = super(DigitizedWorkAdmin, self).get_urls()
my_urls = [
re_path(
r"^import/$",
self.admin_site.admin_view(ImportView.as_view()),
name="import",
),
]
return my_urls + urls
[docs]
class CollectionAdmin(admin.ModelAdmin):
list_display = ("name", "exclude")
list_editable = ("exclude",)
[docs]
class DigitizedWorkInline(admin.TabularInline):
model = DigitizedWork
fields = ("source", "source_id", "title", "subtitle", "author")
extra = 0
[docs]
class ClusterAdmin(admin.ModelAdmin):
list_display = ("cluster_id", "works")
digwork_admin_url = "admin:archive_digitizedwork_changelist"
inlines = [
DigitizedWorkInline,
]
search_fields = ("cluster_id",)
[docs]
def get_queryset(self, request):
# The annotations we use for document count on the list view
# make the search too slow for autocomplete.
# Reset to original, unannotated queryset *only* for autocomplete
qs = super().get_queryset(request)
if request and request.path == "/admin/autocomplete/":
# return without annotations
return qs
# otherwise, annotate with counts
return qs.annotate(Count("digitizedwork"))
[docs]
@admin.display(
ordering="digitizedwork__count",
description="# works in this cluster",
)
def works(self, obj):
"""Custom property to display number of works in a cluster and link
to a filtered view of the digitized works list."""
return format_html(
'<a href="{0}?cluster__id__exact={1!s}">{2}</a>',
reverse(self.digwork_admin_url),
str(obj.id),
obj.digitizedwork__count,
)
admin.site.register(DigitizedWork, DigitizedWorkAdmin)
admin.site.register(Collection, CollectionAdmin)
admin.site.register(Cluster, ClusterAdmin)
