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