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496 lines
21 KiB
Python
496 lines
21 KiB
Python
5 years ago
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from datetime import datetime, timedelta
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from django import forms
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from django.conf import settings
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from django.contrib import messages
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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.db.models.expressions import Combinable, F, OrderBy
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from django.urls import reverse
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from django.utils.http import urlencode
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from django.utils.timezone import make_aware
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from django.utils.translation import gettext
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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 ChangeListSearchForm(forms.Form):
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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# Populate "fields" dynamically because SEARCH_VAR is a variable:
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self.fields = {
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SEARCH_VAR: forms.CharField(required=False, strip=False),
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}
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class ChangeList:
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search_form_class = ChangeListSearchForm
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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, sortable_by):
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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.has_filters = None
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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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self.sortable_by = sortable_by
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# Get search parameters from the query string.
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_search_form = self.search_form_class(request.GET)
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if not _search_form.is_valid():
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for error in _search_form.errors.values():
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messages.error(request, ', '.join(error))
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self.query = _search_form.cleaned_data.get(SEARCH_VAR) or ''
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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.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 = gettext('Select %s')
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elif self.model_admin.has_change_permission(request):
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title = gettext('Select %s to change')
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else:
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title = gettext('Select %s to view')
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self.title = title % 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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Return all params except IGNORED_PARAMS.
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"""
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params = params or 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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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 the
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# 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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lookup_params_count = len(lookup_params)
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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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# field_list_filter_class removes any lookup_params it
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# processes. If that happened, check if distinct() is needed to
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# remove duplicate results.
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if lookup_params_count > len(lookup_params):
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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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if self.date_hierarchy:
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# Create bounded lookup parameters so that the query is more
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# efficient.
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year = lookup_params.pop('%s__year' % self.date_hierarchy, None)
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if year is not None:
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month = lookup_params.pop('%s__month' % self.date_hierarchy, None)
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day = lookup_params.pop('%s__day' % self.date_hierarchy, None)
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try:
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from_date = datetime(
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int(year),
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int(month if month is not None else 1),
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int(day if day is not None else 1),
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)
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except ValueError as e:
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raise IncorrectLookupParameters(e) from e
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if settings.USE_TZ:
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from_date = make_aware(from_date)
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if day:
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to_date = from_date + timedelta(days=1)
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elif month:
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# In this branch, from_date will always be the first of a
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# month, so advancing 32 days gives the next month.
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to_date = (from_date + timedelta(days=32)).replace(day=1)
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else:
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to_date = from_date.replace(year=from_date.year + 1)
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lookup_params.update({
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'%s__gte' % self.date_hierarchy: from_date,
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'%s__lt' % self.date_hierarchy: to_date,
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})
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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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raise IncorrectLookupParameters(e) from e
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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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Return 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. Return 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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if isinstance(attr, property) and hasattr(attr, 'fget'):
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attr = attr.fget
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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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Return the list of ordering fields for the change list.
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First check the get_ordering() method in model admin, then 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 calling _get_deterministic_ordering() with the
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constructed ordering.
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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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if hasattr(order_field, 'as_sql'):
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# order_field is an expression.
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ordering.append(order_field.desc() if pfx == '-' else order_field.asc())
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# reverse order if order_field has already "-" as prefix
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elif 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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return self._get_deterministic_ordering(ordering)
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def _get_deterministic_ordering(self, ordering):
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"""
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Ensure a deterministic order across all database backends. Search for a
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single field or unique together set of fields providing a total
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ordering. If these are missing, augment the ordering with a descendant
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primary key.
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"""
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ordering = list(ordering)
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ordering_fields = set()
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total_ordering_fields = {'pk'} | {
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field.attname for field in self.lookup_opts.fields
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if field.unique and not field.null
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}
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for part in ordering:
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# Search for single field providing a total ordering.
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field_name = None
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if isinstance(part, str):
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field_name = part.lstrip('-')
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elif isinstance(part, F):
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field_name = part.name
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|
elif isinstance(part, OrderBy) and isinstance(part.expression, F):
|
||
|
|
field_name = part.expression.name
|
||
|
|
if field_name:
|
||
|
|
# Normalize attname references by using get_field().
|
||
|
|
try:
|
||
|
|
field = self.lookup_opts.get_field(field_name)
|
||
|
|
except FieldDoesNotExist:
|
||
|
|
# Could be "?" for random ordering or a related field
|
||
|
|
# lookup. Skip this part of introspection for now.
|
||
|
|
continue
|
||
|
|
# Ordering by a related field name orders by the referenced
|
||
|
|
# model's ordering. Skip this part of introspection for now.
|
||
|
|
if field.remote_field and field_name == field.name:
|
||
|
|
continue
|
||
|
|
if field.attname in total_ordering_fields:
|
||
|
|
break
|
||
|
|
ordering_fields.add(field.attname)
|
||
|
|
else:
|
||
|
|
# No single total ordering field, try unique_together.
|
||
|
|
for field_names in self.lookup_opts.unique_together:
|
||
|
|
# Normalize attname references by using get_field().
|
||
|
|
fields = [self.lookup_opts.get_field(field_name) for field_name in field_names]
|
||
|
|
# Composite unique constraints containing a nullable column
|
||
|
|
# cannot ensure total ordering.
|
||
|
|
if any(field.null for field in fields):
|
||
|
|
continue
|
||
|
|
if ordering_fields.issuperset(field.attname for field in fields):
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
# If no set of unique fields is present in the ordering, rely
|
||
|
|
# on the primary key to provide total ordering.
|
||
|
|
ordering.append('-pk')
|
||
|
|
return ordering
|
||
|
|
|
||
|
|
def get_ordering_field_columns(self):
|
||
|
|
"""
|
||
|
|
Return a dictionary of ordering field column numbers and asc/desc.
|
||
|
|
"""
|
||
|
|
# We must cope with more than one column having the same underlying sort
|
||
|
|
# field, so we base things on column numbers.
|
||
|
|
ordering = self._get_default_ordering()
|
||
|
|
ordering_fields = {}
|
||
|
|
if ORDER_VAR not in self.params:
|
||
|
|
# for ordering specified on ModelAdmin or model Meta, we don't know
|
||
|
|
# the right column numbers absolutely, because there might be more
|
||
|
|
# than one column associated with that ordering, so we guess.
|
||
|
|
for field in ordering:
|
||
|
|
if isinstance(field, (Combinable, OrderBy)):
|
||
|
|
if not isinstance(field, OrderBy):
|
||
|
|
field = field.asc()
|
||
|
|
if isinstance(field.expression, F):
|
||
|
|
order_type = 'desc' if field.descending else 'asc'
|
||
|
|
field = field.expression.name
|
||
|
|
else:
|
||
|
|
continue
|
||
|
|
elif field.startswith('-'):
|
||
|
|
field = field[1:]
|
||
|
|
order_type = 'desc'
|
||
|
|
else:
|
||
|
|
order_type = 'asc'
|
||
|
|
for index, attr in enumerate(self.list_display):
|
||
|
|
if self.get_ordering_field(attr) == field:
|
||
|
|
ordering_fields[index] = order_type
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
for p in self.params[ORDER_VAR].split('.'):
|
||
|
|
none, pfx, idx = p.rpartition('-')
|
||
|
|
try:
|
||
|
|
idx = int(idx)
|
||
|
|
except ValueError:
|
||
|
|
continue # skip it
|
||
|
|
ordering_fields[idx] = 'desc' if pfx == '-' else 'asc'
|
||
|
|
return ordering_fields
|
||
|
|
|
||
|
|
def get_queryset(self, request):
|
||
|
|
# First, we collect all the declared list filters.
|
||
|
|
(self.filter_specs, self.has_filters, remaining_lookup_params,
|
||
|
|
filters_use_distinct) = self.get_filters(request)
|
||
|
|
|
||
|
|
# Then, we let every list filter modify the queryset to its liking.
|
||
|
|
qs = self.root_queryset
|
||
|
|
for filter_spec in self.filter_specs:
|
||
|
|
new_qs = filter_spec.queryset(request, qs)
|
||
|
|
if new_qs is not None:
|
||
|
|
qs = new_qs
|
||
|
|
|
||
|
|
try:
|
||
|
|
# Finally, we apply the remaining lookup parameters from the query
|
||
|
|
# string (i.e. those that haven't already been processed by the
|
||
|
|
# filters).
|
||
|
|
qs = qs.filter(**remaining_lookup_params)
|
||
|
|
except (SuspiciousOperation, ImproperlyConfigured):
|
||
|
|
# Allow certain types of errors to be re-raised as-is so that the
|
||
|
|
# caller can treat them in a special way.
|
||
|
|
raise
|
||
|
|
except Exception as e:
|
||
|
|
# Every other error is caught with a naked except, because we don't
|
||
|
|
# have any other way of validating lookup parameters. 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, ValidationError, or ?.
|
||
|
|
raise IncorrectLookupParameters(e)
|
||
|
|
|
||
|
|
if not qs.query.select_related:
|
||
|
|
qs = self.apply_select_related(qs)
|
||
|
|
|
||
|
|
# Set ordering.
|
||
|
|
ordering = self.get_ordering(request, qs)
|
||
|
|
qs = qs.order_by(*ordering)
|
||
|
|
|
||
|
|
# Apply search results
|
||
|
|
qs, search_use_distinct = self.model_admin.get_search_results(request, qs, self.query)
|
||
|
|
|
||
|
|
# Remove duplicates from results, if necessary
|
||
|
|
if filters_use_distinct | search_use_distinct:
|
||
|
|
return qs.distinct()
|
||
|
|
else:
|
||
|
|
return qs
|
||
|
|
|
||
|
|
def apply_select_related(self, qs):
|
||
|
|
if self.list_select_related is True:
|
||
|
|
return qs.select_related()
|
||
|
|
|
||
|
|
if self.list_select_related is False:
|
||
|
|
if self.has_related_field_in_list_display():
|
||
|
|
return qs.select_related()
|
||
|
|
|
||
|
|
if self.list_select_related:
|
||
|
|
return qs.select_related(*self.list_select_related)
|
||
|
|
return qs
|
||
|
|
|
||
|
|
def has_related_field_in_list_display(self):
|
||
|
|
for field_name in self.list_display:
|
||
|
|
try:
|
||
|
|
field = self.lookup_opts.get_field(field_name)
|
||
|
|
except FieldDoesNotExist:
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
if isinstance(field.remote_field, models.ManyToOneRel):
|
||
|
|
# <FK>_id field names don't require a join.
|
||
|
|
if field_name != field.get_attname():
|
||
|
|
return True
|
||
|
|
return False
|
||
|
|
|
||
|
|
def url_for_result(self, result):
|
||
|
|
pk = getattr(result, self.pk_attname)
|
||
|
|
return reverse('admin:%s_%s_change' % (self.opts.app_label,
|
||
|
|
self.opts.model_name),
|
||
|
|
args=(quote(pk),),
|
||
|
|
current_app=self.model_admin.admin_site.name)
|