245 lines
10 KiB
Python
245 lines
10 KiB
Python
from django.contrib.admin.filterspecs import FilterSpec
|
|
from django.contrib.admin.options import IncorrectLookupParameters
|
|
from django.contrib.admin.util import quote
|
|
from django.core.paginator import Paginator, InvalidPage
|
|
from django.db import models
|
|
from django.db.models.query import QuerySet
|
|
from django.utils.encoding import force_unicode, smart_str
|
|
from django.utils.translation import ugettext
|
|
from django.utils.http import urlencode
|
|
import operator
|
|
|
|
try:
|
|
set
|
|
except NameError:
|
|
from sets import Set as set # Python 2.3 fallback
|
|
|
|
# The system will display a "Show all" link on the change list only if the
|
|
# total result count is less than or equal to this setting.
|
|
MAX_SHOW_ALL_ALLOWED = 200
|
|
|
|
# Changelist settings
|
|
ALL_VAR = 'all'
|
|
ORDER_VAR = 'o'
|
|
ORDER_TYPE_VAR = 'ot'
|
|
PAGE_VAR = 'p'
|
|
SEARCH_VAR = 'q'
|
|
TO_FIELD_VAR = 't'
|
|
IS_POPUP_VAR = 'pop'
|
|
ERROR_FLAG = 'e'
|
|
|
|
# Text to display within change-list table cells if the value is blank.
|
|
EMPTY_CHANGELIST_VALUE = '(None)'
|
|
|
|
class ChangeList(object):
|
|
def __init__(self, request, model, list_display, list_display_links, list_filter, date_hierarchy, search_fields, list_select_related, list_per_page, list_editable, model_admin):
|
|
self.model = model
|
|
self.opts = model._meta
|
|
self.lookup_opts = self.opts
|
|
self.root_query_set = model_admin.queryset(request)
|
|
self.list_display = list_display
|
|
self.list_display_links = list_display_links
|
|
self.list_filter = list_filter
|
|
self.date_hierarchy = date_hierarchy
|
|
self.search_fields = search_fields
|
|
self.list_select_related = list_select_related
|
|
self.list_per_page = list_per_page
|
|
self.list_editable = list_editable
|
|
self.model_admin = model_admin
|
|
|
|
# Get search parameters from the query string.
|
|
try:
|
|
self.page_num = int(request.GET.get(PAGE_VAR, 0))
|
|
except ValueError:
|
|
self.page_num = 0
|
|
self.show_all = ALL_VAR in request.GET
|
|
self.is_popup = IS_POPUP_VAR in request.GET
|
|
self.to_field = request.GET.get(TO_FIELD_VAR)
|
|
self.params = dict(request.GET.items())
|
|
if PAGE_VAR in self.params:
|
|
del self.params[PAGE_VAR]
|
|
if TO_FIELD_VAR in self.params:
|
|
del self.params[TO_FIELD_VAR]
|
|
if ERROR_FLAG in self.params:
|
|
del self.params[ERROR_FLAG]
|
|
|
|
self.order_field, self.order_type = self.get_ordering()
|
|
self.query = request.GET.get(SEARCH_VAR, '')
|
|
self.query_set = self.get_query_set()
|
|
self.get_results(request)
|
|
self.title = (self.is_popup and ugettext('Select %s') % force_unicode(self.opts.verbose_name) or ugettext('Select %s to change') % force_unicode(self.opts.verbose_name))
|
|
self.filter_specs, self.has_filters = self.get_filters(request)
|
|
self.pk_attname = self.lookup_opts.pk.attname
|
|
|
|
def get_filters(self, request):
|
|
filter_specs = []
|
|
if self.list_filter:
|
|
filter_fields = [self.lookup_opts.get_field(field_name) for field_name in self.list_filter]
|
|
for f in filter_fields:
|
|
spec = FilterSpec.create(f, request, self.params, self.model, self.model_admin)
|
|
if spec and spec.has_output():
|
|
filter_specs.append(spec)
|
|
return filter_specs, bool(filter_specs)
|
|
|
|
def get_query_string(self, new_params=None, remove=None):
|
|
if new_params is None: new_params = {}
|
|
if remove is None: remove = []
|
|
p = self.params.copy()
|
|
for r in remove:
|
|
for k in p.keys():
|
|
if k.startswith(r):
|
|
del p[k]
|
|
for k, v in new_params.items():
|
|
if v is None:
|
|
if k in p:
|
|
del p[k]
|
|
else:
|
|
p[k] = v
|
|
return '?%s' % urlencode(p)
|
|
|
|
def get_results(self, request):
|
|
paginator = Paginator(self.query_set, self.list_per_page)
|
|
# Get the number of objects, with admin filters applied.
|
|
result_count = paginator.count
|
|
|
|
# Get the total number of objects, with no admin filters applied.
|
|
# Perform a slight optimization: Check to see whether any filters were
|
|
# given. If not, use paginator.hits to calculate the number of objects,
|
|
# because we've already done paginator.hits and the value is cached.
|
|
if not self.query_set.query.where:
|
|
full_result_count = result_count
|
|
else:
|
|
full_result_count = self.root_query_set.count()
|
|
|
|
can_show_all = result_count <= MAX_SHOW_ALL_ALLOWED
|
|
multi_page = result_count > self.list_per_page
|
|
|
|
# Get the list of objects to display on this page.
|
|
if (self.show_all and can_show_all) or not multi_page:
|
|
result_list = list(self.query_set)
|
|
else:
|
|
try:
|
|
result_list = paginator.page(self.page_num+1).object_list
|
|
except InvalidPage:
|
|
result_list = ()
|
|
|
|
self.result_count = result_count
|
|
self.full_result_count = full_result_count
|
|
self.result_list = result_list
|
|
self.can_show_all = can_show_all
|
|
self.multi_page = multi_page
|
|
self.paginator = paginator
|
|
|
|
def get_ordering(self):
|
|
lookup_opts, params = self.lookup_opts, self.params
|
|
# For ordering, first check the "ordering" parameter in the admin
|
|
# options, then check the object's default ordering. If neither of
|
|
# those exist, order descending by ID by default. Finally, look for
|
|
# manually-specified ordering from the query string.
|
|
ordering = self.model_admin.ordering or lookup_opts.ordering or ['-' + lookup_opts.pk.name]
|
|
|
|
if ordering[0].startswith('-'):
|
|
order_field, order_type = ordering[0][1:], 'desc'
|
|
else:
|
|
order_field, order_type = ordering[0], 'asc'
|
|
if ORDER_VAR in params:
|
|
try:
|
|
field_name = self.list_display[int(params[ORDER_VAR])]
|
|
try:
|
|
f = lookup_opts.get_field(field_name)
|
|
except models.FieldDoesNotExist:
|
|
# See whether field_name is a name of a non-field
|
|
# that allows sorting.
|
|
try:
|
|
if callable(field_name):
|
|
attr = field_name
|
|
elif hasattr(self.model_admin, field_name):
|
|
attr = getattr(self.model_admin, field_name)
|
|
else:
|
|
attr = getattr(self.model, field_name)
|
|
order_field = attr.admin_order_field
|
|
except AttributeError:
|
|
pass
|
|
else:
|
|
order_field = f.name
|
|
except (IndexError, ValueError):
|
|
pass # Invalid ordering specified. Just use the default.
|
|
if ORDER_TYPE_VAR in params and params[ORDER_TYPE_VAR] in ('asc', 'desc'):
|
|
order_type = params[ORDER_TYPE_VAR]
|
|
return order_field, order_type
|
|
|
|
def get_query_set(self):
|
|
qs = self.root_query_set
|
|
lookup_params = self.params.copy() # a dictionary of the query string
|
|
for i in (ALL_VAR, ORDER_VAR, ORDER_TYPE_VAR, SEARCH_VAR, IS_POPUP_VAR):
|
|
if i in lookup_params:
|
|
del lookup_params[i]
|
|
for key, value in lookup_params.items():
|
|
if not isinstance(key, str):
|
|
# 'key' will be used as a keyword argument later, so Python
|
|
# requires it to be a string.
|
|
del lookup_params[key]
|
|
lookup_params[smart_str(key)] = value
|
|
|
|
# if key ends with __in, split parameter into separate values
|
|
if key.endswith('__in'):
|
|
lookup_params[key] = value.split(',')
|
|
|
|
# Apply lookup parameters from the query string.
|
|
try:
|
|
qs = qs.filter(**lookup_params)
|
|
# Naked except! Because we don't have any other way of validating "params".
|
|
# They might be invalid if the keyword arguments are incorrect, or if the
|
|
# values are not in the correct type, so we might get FieldError, ValueError,
|
|
# ValicationError, or ? from a custom field that raises yet something else
|
|
# when handed impossible data.
|
|
except:
|
|
raise IncorrectLookupParameters
|
|
|
|
# Use select_related() if one of the list_display options is a field
|
|
# with a relationship.
|
|
if self.list_select_related:
|
|
qs = qs.select_related()
|
|
else:
|
|
for field_name in self.list_display:
|
|
try:
|
|
f = self.lookup_opts.get_field(field_name)
|
|
except models.FieldDoesNotExist:
|
|
pass
|
|
else:
|
|
if isinstance(f.rel, models.ManyToOneRel):
|
|
qs = qs.select_related()
|
|
break
|
|
|
|
# Set ordering.
|
|
if self.order_field:
|
|
qs = qs.order_by('%s%s' % ((self.order_type == 'desc' and '-' or ''), self.order_field))
|
|
|
|
# Apply keyword searches.
|
|
def construct_search(field_name):
|
|
if field_name.startswith('^'):
|
|
return "%s__istartswith" % field_name[1:]
|
|
elif field_name.startswith('='):
|
|
return "%s__iexact" % field_name[1:]
|
|
elif field_name.startswith('@'):
|
|
return "%s__search" % field_name[1:]
|
|
else:
|
|
return "%s__icontains" % field_name
|
|
|
|
if self.search_fields and self.query:
|
|
for bit in self.query.split():
|
|
or_queries = [models.Q(**{construct_search(field_name): bit}) for field_name in self.search_fields]
|
|
other_qs = QuerySet(self.model)
|
|
other_qs.dup_select_related(qs)
|
|
other_qs = other_qs.filter(reduce(operator.or_, or_queries))
|
|
qs = qs & other_qs
|
|
for field_name in self.search_fields:
|
|
if '__' in field_name:
|
|
qs = qs.distinct()
|
|
break
|
|
|
|
return qs
|
|
|
|
def url_for_result(self, result):
|
|
return "%s/" % quote(getattr(result, self.pk_attname))
|