| 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' |
| 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, 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.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.params = dict(request.GET.items()) |
| if PAGE_VAR in self.params: |
| del self.params[PAGE_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. |
| try: |
| result_count = paginator.count |
| # 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 (which would |
| # result in a database error). |
| except: |
| raise IncorrectLookupParameters |
| |
| # 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: |
| attr = getattr(self.model, field_name) |
| order_field = attr.admin_order_field |
| except AttributeError: |
| pass |
| else: |
| if not isinstance(f.rel, models.ManyToOneRel) or not f.null: |
| 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 |
| |
| # Apply lookup parameters from the query string. |
| qs = qs.filter(**lookup_params) |
| |
| # 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 |
| |
| if self.opts.one_to_one_field: |
| qs = qs.complex_filter(self.opts.one_to_one_field.rel.limit_choices_to) |
| |
| return qs |
| |
| def url_for_result(self, result): |
| return "%s/" % quote(getattr(result, self.pk_attname)) |
