383 lines
16 KiB
Python
383 lines
16 KiB
Python
import sys
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from collections import OrderedDict
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from django.contrib.admin import FieldListFilter
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from django.contrib.admin.exceptions import (
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DisallowedModelAdminLookup, DisallowedModelAdminToField,
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)
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from django.contrib.admin.options import (
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IS_POPUP_VAR, TO_FIELD_VAR, IncorrectLookupParameters,
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)
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from django.contrib.admin.utils import (
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get_fields_from_path, lookup_needs_distinct, prepare_lookup_value, quote,
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)
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from django.core.exceptions import (
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FieldDoesNotExist, ImproperlyConfigured, SuspiciousOperation,
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)
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from django.core.paginator import InvalidPage
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from django.db import models
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from django.urls import reverse
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from django.utils import six
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from django.utils.encoding import force_text
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from django.utils.http import urlencode
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from django.utils.translation import ugettext
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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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ERROR_FLAG = 'e'
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IGNORED_PARAMS = (
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ALL_VAR, ORDER_VAR, ORDER_TYPE_VAR, SEARCH_VAR, IS_POPUP_VAR, TO_FIELD_VAR)
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class ChangeList(object):
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def __init__(self, request, model, list_display, list_display_links,
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list_filter, date_hierarchy, search_fields, list_select_related,
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list_per_page, list_max_show_all, list_editable, 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_queryset = model_admin.get_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.list_max_show_all = list_max_show_all
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self.model_admin = model_admin
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self.preserved_filters = model_admin.get_preserved_filters(request)
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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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to_field = request.GET.get(TO_FIELD_VAR)
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if to_field and not model_admin.to_field_allowed(request, to_field):
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raise DisallowedModelAdminToField("The field %s cannot be referenced." % to_field)
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self.to_field = to_field
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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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if self.is_popup:
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self.list_editable = ()
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else:
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self.list_editable = list_editable
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self.query = request.GET.get(SEARCH_VAR, '')
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self.queryset = self.get_queryset(request)
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self.get_results(request)
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if self.is_popup:
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title = ugettext('Select %s')
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else:
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title = ugettext('Select %s to change')
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self.title = title % force_text(self.opts.verbose_name)
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self.pk_attname = self.lookup_opts.pk.attname
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def get_filters_params(self, params=None):
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"""
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Returns all params except IGNORED_PARAMS
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"""
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if not params:
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params = self.params
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lookup_params = params.copy() # a dictionary of the query string
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# Remove all the parameters that are globally and systematically
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# ignored.
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for ignored in IGNORED_PARAMS:
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if ignored in lookup_params:
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del lookup_params[ignored]
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return lookup_params
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def get_filters(self, request):
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lookup_params = self.get_filters_params()
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use_distinct = False
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for key, value in lookup_params.items():
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if not self.model_admin.lookup_allowed(key, value):
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raise DisallowedModelAdminLookup("Filtering by %s not allowed" % key)
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filter_specs = []
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if self.list_filter:
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for list_filter in self.list_filter:
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if callable(list_filter):
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# This is simply a custom list filter class.
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spec = list_filter(request, lookup_params, self.model, self.model_admin)
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else:
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field_path = None
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if isinstance(list_filter, (tuple, list)):
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# This is a custom FieldListFilter class for a given field.
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field, field_list_filter_class = list_filter
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else:
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# This is simply a field name, so use the default
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# FieldListFilter class that has been registered for
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# the type of the given field.
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field, field_list_filter_class = list_filter, FieldListFilter.create
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if not isinstance(field, models.Field):
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field_path = field
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field = get_fields_from_path(self.model, field_path)[-1]
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spec = field_list_filter_class(
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field, request, lookup_params,
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self.model, self.model_admin, field_path=field_path
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)
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# Check if we need to use distinct()
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use_distinct = use_distinct or lookup_needs_distinct(self.lookup_opts, field_path)
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if spec and spec.has_output():
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filter_specs.append(spec)
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# At this point, all the parameters used by the various ListFilters
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# have been removed from lookup_params, which now only contains other
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# parameters passed via the query string. We now loop through the
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# remaining parameters both to ensure that all the parameters are valid
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# fields and to determine if at least one of them needs distinct(). If
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# the lookup parameters aren't real fields, then bail out.
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try:
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for key, value in lookup_params.items():
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lookup_params[key] = prepare_lookup_value(key, value)
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use_distinct = use_distinct or lookup_needs_distinct(self.lookup_opts, key)
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return filter_specs, bool(filter_specs), lookup_params, use_distinct
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except FieldDoesNotExist as e:
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six.reraise(IncorrectLookupParameters, IncorrectLookupParameters(e), sys.exc_info()[2])
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def get_query_string(self, new_params=None, remove=None):
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if new_params is None:
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new_params = {}
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if remove is None:
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remove = []
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p = self.params.copy()
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for r in remove:
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for k in list(p):
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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(sorted(p.items()))
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def get_results(self, request):
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paginator = self.model_admin.get_paginator(request, self.queryset, self.list_per_page)
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# Get the number of objects, with admin filters applied.
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result_count = paginator.count
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# Get the total number of objects, with no admin filters applied.
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if self.model_admin.show_full_result_count:
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full_result_count = self.root_queryset.count()
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else:
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full_result_count = None
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can_show_all = result_count <= self.list_max_show_all
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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 = self.queryset._clone()
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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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raise IncorrectLookupParameters
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self.result_count = result_count
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self.show_full_result_count = self.model_admin.show_full_result_count
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# Admin actions are shown if there is at least one entry
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# or if entries are not counted because show_full_result_count is disabled
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self.show_admin_actions = not self.show_full_result_count or bool(full_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_default_ordering(self):
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ordering = []
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if self.model_admin.ordering:
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ordering = self.model_admin.ordering
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elif self.lookup_opts.ordering:
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ordering = self.lookup_opts.ordering
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return ordering
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def get_ordering_field(self, field_name):
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"""
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Returns the proper model field name corresponding to the given
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field_name to use for ordering. field_name may either be the name of a
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proper model field or the name of a method (on the admin or model) or a
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callable with the 'admin_order_field' attribute. Returns None if no
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proper model field name can be matched.
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"""
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try:
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field = self.lookup_opts.get_field(field_name)
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return field.name
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except 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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if callable(field_name):
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attr = field_name
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elif hasattr(self.model_admin, field_name):
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attr = getattr(self.model_admin, field_name)
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else:
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attr = getattr(self.model, field_name)
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return getattr(attr, 'admin_order_field', None)
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def get_ordering(self, request, queryset):
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"""
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Returns the list of ordering fields for the change list.
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First we check the get_ordering() method in model admin, then we check
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the object's default ordering. Then, any manually-specified ordering
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from the query string overrides anything. Finally, a deterministic
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order is guaranteed by ensuring the primary key is used as the last
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ordering field.
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"""
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params = self.params
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ordering = list(self.model_admin.get_ordering(request) or self._get_default_ordering())
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if ORDER_VAR in params:
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# Clear ordering and used params
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ordering = []
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order_params = params[ORDER_VAR].split('.')
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for p in order_params:
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try:
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none, pfx, idx = p.rpartition('-')
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field_name = self.list_display[int(idx)]
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order_field = self.get_ordering_field(field_name)
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if not order_field:
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continue # No 'admin_order_field', skip it
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# reverse order if order_field has already "-" as prefix
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if order_field.startswith('-') and pfx == "-":
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ordering.append(order_field[1:])
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else:
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ordering.append(pfx + order_field)
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except (IndexError, ValueError):
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continue # Invalid ordering specified, skip it.
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# Add the given query's ordering fields, if any.
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ordering.extend(queryset.query.order_by)
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# Ensure that the primary key is systematically present in the list of
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# ordering fields so we can guarantee a deterministic order across all
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# database backends.
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pk_name = self.lookup_opts.pk.name
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if not (set(ordering) & {'pk', '-pk', pk_name, '-' + pk_name}):
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# The two sets do not intersect, meaning the pk isn't present. So
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# we add it.
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ordering.append('-pk')
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return ordering
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def get_ordering_field_columns(self):
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"""
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Returns an OrderedDict of ordering field column numbers and asc/desc
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"""
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# We must cope with more than one column having the same underlying sort
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# field, so we base things on column numbers.
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ordering = self._get_default_ordering()
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ordering_fields = OrderedDict()
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if ORDER_VAR not in self.params:
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# for ordering specified on ModelAdmin or model Meta, we don't know
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# the right column numbers absolutely, because there might be more
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# than one column associated with that ordering, so we guess.
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for field in ordering:
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if field.startswith('-'):
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field = field[1:]
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order_type = 'desc'
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else:
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order_type = 'asc'
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for index, attr in enumerate(self.list_display):
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if self.get_ordering_field(attr) == field:
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ordering_fields[index] = order_type
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break
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else:
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for p in self.params[ORDER_VAR].split('.'):
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none, pfx, idx = p.rpartition('-')
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try:
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idx = int(idx)
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except ValueError:
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continue # skip it
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ordering_fields[idx] = 'desc' if pfx == '-' else 'asc'
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return ordering_fields
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def get_queryset(self, request):
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# First, we collect all the declared list filters.
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(self.filter_specs, self.has_filters, remaining_lookup_params,
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filters_use_distinct) = self.get_filters(request)
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# Then, we let every list filter modify the queryset to its liking.
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qs = self.root_queryset
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for filter_spec in self.filter_specs:
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new_qs = filter_spec.queryset(request, qs)
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if new_qs is not None:
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qs = new_qs
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try:
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# Finally, we apply the remaining lookup parameters from the query
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# string (i.e. those that haven't already been processed by the
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# filters).
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qs = qs.filter(**remaining_lookup_params)
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except (SuspiciousOperation, ImproperlyConfigured):
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# Allow certain types of errors to be re-raised as-is so that the
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# caller can treat them in a special way.
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raise
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except Exception as e:
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# Every other error is caught with a naked except, because we don't
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# have any other way of validating lookup parameters. They might be
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# invalid if the keyword arguments are incorrect, or if the values
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# are not in the correct type, so we might get FieldError,
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# ValueError, ValidationError, or ?.
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raise IncorrectLookupParameters(e)
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if not qs.query.select_related:
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qs = self.apply_select_related(qs)
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# Set ordering.
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ordering = self.get_ordering(request, qs)
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qs = qs.order_by(*ordering)
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# Apply search results
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qs, search_use_distinct = self.model_admin.get_search_results(request, qs, self.query)
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# Remove duplicates from results, if necessary
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if filters_use_distinct | search_use_distinct:
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return qs.distinct()
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else:
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return qs
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def apply_select_related(self, qs):
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if self.list_select_related is True:
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return qs.select_related()
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if self.list_select_related is False:
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if self.has_related_field_in_list_display():
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return qs.select_related()
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if self.list_select_related:
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return qs.select_related(*self.list_select_related)
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return qs
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def has_related_field_in_list_display(self):
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for field_name in self.list_display:
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try:
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field = self.lookup_opts.get_field(field_name)
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except FieldDoesNotExist:
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pass
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else:
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if isinstance(field.remote_field, models.ManyToOneRel):
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return True
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return False
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def url_for_result(self, result):
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pk = getattr(result, self.pk_attname)
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return reverse('admin:%s_%s_change' % (self.opts.app_label,
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self.opts.model_name),
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args=(quote(pk),),
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current_app=self.model_admin.admin_site.name)
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