我知道如何在管理员视图中创建自定义list_filter
(例如,继承SimpleFilter
)。
我真正想要的是(在管理列表视图中)"检查"在OR公式中组合它们的不同过滤器。
举个例子,假设你有:
# models.py
class Foo(models.Model):
foobar = ...
foofie = ...
...
# admin.py
class FooAdmin(admin.ModelAdmin):
list_filter = ( "foobar", "foofie" )
...
在FooAdmin
生成的管理列表视图中,我可以选择按foobar
或foofie
过滤记录。有没有办法按公式过滤它们:foobar = X OR foofie = Y
,其中X
和Y
是foobar
和foofie
可以假设的两个值?
甚至可能吗?
我知道在django管理员视图中并非一切皆有可能,但这似乎是一个非常常见的请求,我想知道我是否错过理解或阅读的东西。
欢迎使用第三方应用程序。谢谢:))
答案 0 :(得分:4)
我刚刚找到了第三方应用,django-advanced-filters符合您的要求。
它有:
OR字段
OR是添加到每个可用规则的附加字段 字段。
它允许使用OR语句构造查询。你可以使用它 创建一个“空”规则,该字段“介于”一组1或更多 规则。
答案 1 :(得分:2)
首先,我尝试解释django管理过滤器的工作原理。当您想要在管理页面中过滤您的查询集时,django会查找所有已注册的过滤器。如果使用此值为filter django filter queryset设置值。如果你设置多个过滤器django过滤你的查询集两次,这等于queryset = queryset.filter(param1 = 1).filter(param2 = 2)或在SQL中:SELECT ... WHERE param1 = 1 AND param2 = 2。这是因为你无法使用标准的django过滤器。但你可以像这样编写自己的过滤器:
from django.contrib.admin import SimpleListFilter
from django.db.models import Q
from functools import reduce
import operator
from django.core.exceptions import FieldError
class ORListFilter(SimpleListFilter):
title = ''
parameter_name = ''
search_field = ('',)
def queryset(self, request, queryset):
filters = request.GET.copy()
try: #for search
search_field_value = filters.pop('q')[0]
query_params = [Q((key, search_field_value)) for key in self.search_field]
try:
queryset = queryset.filter(reduce(operator.or_, query_params))
except FieldError:
pass
except KeyError:
pass
try:
query_params = [Q((key, value)) for key, value in filters.dict().items()]
queryset = queryset.filter(reduce(operator.or_, query_params))
except TypeError:
pass
return queryset
def lookups(self, request, model_admin):
qs = model_admin.get_queryset(request)
parameters = qs.all().values(self.parameter_name).distinct()
for parameter in parameters:
value = dict(parameter).pop(self.parameter_name, None)
if value:
yield (value, value)
else:
yield (None, 'NULL')
class Field1Filter(ORListFilter):
title = 'title'
parameter_name = 'field1'
search_field = ('search1', 'search2')
class Field2Filter(ORListFilter):
title = 'title'
parameter_name = 'field2'
search_field = ('search1', 'search2')
并在admin:
中注册search_fields = ('search1', 'search2')
list_filter = (Field1Filter, Field2Filter)
它不适用于标准的django过滤器,list_filter中的所有值都必须从ORListFilter类继承。此外,它不适用于日期时间过滤器,但您可以添加此功能。
答案 2 :(得分:2)
找出解决方案:
import operator
from functools import reduce
from django.contrib.admin import ListFilter, FieldListFilter
from django.db.models import Q
from django.contrib.admin.utils import (
get_fields_from_path, lookup_needs_distinct, prepare_lookup_value,
)
from django.http import QueryDict
class OrListFilter(ListFilter):
parameter_prefix = None
fields = None
def __init__(self, request, params, model, model_admin):
super(OrListFilter, self).__init__(
request, params, model, model_admin)
if self.parameter_prefix is None:
raise ImproperlyConfigured(
"The list filter '%s' does not specify "
"a 'parameter_prefix'." % self.__class__.__name__)
self.model_admin = model_admin
self.model = model
self.request = request
self.filter_specs = self.get_filters(request, {}, prefix=self.parameter_prefix+'-')
for p in self.expected_parameters():
if p in params:
value = params.pop(p)
field = p.split('-')[1]
self.used_parameters[field] = prepare_lookup_value(field, value)
def has_output(self):
return True
# see https://github.com/django/django/blob/1.8.5/django/contrib/admin/views/main.py#L104
def get_filters(self, request, params, prefix=''):
filter_specs = []
for field_path in self.fields:
field = get_fields_from_path(self.model, field_path)[-1]
field_list_filter_class = FieldListFilter.create
spec = field_list_filter_class(field, request, params,
self.model, self.model_admin, field_path=prefix + field_path)
# Check if we need to use distinct()
# use_distinct = (use_distinct or
# lookup_needs_distinct(self.lookup_opts,
# field_path))
filter_specs.append(spec)
return filter_specs
def expected_parameters(self):
parameters = []
for spec in self.filter_specs:
parameters += spec.expected_parameters()
return parameters
def choices(self, cl):
return []
def queryset(self, request, queryset):
origin_GET = request.GET.copy()
fake_GET = QueryDict(mutable=True)
fake_GET.update(self.used_parameters)
request.GET = fake_GET
all_params = {}
for spec in self.get_filters(request, self.used_parameters):
if spec and spec.has_output():
all_params.update(spec.used_parameters)
try:
query_params = [Q((key, value)) for key, value in all_params.items()]
queryset = queryset.filter(reduce(operator.or_, query_params))
except TypeError as e:
pass
# restore
request.GET = origin_GET
return queryset
class OrFilter(OrListFilter):
title = 'Or filter'
parameter_prefix = 'or1'
fields = ("foobar", "foofie")
class FooAdmin(admin.ModelAdmin):
list_filter = (OrFilter, )
APP_NAME /模板/管理/ APP_NAME / change_list.html:
{% extends "admin/change_list.html" %}
{% load i18n admin_list %}
{% block filters %}
{% if cl.has_filters %}
<div id="changelist-filter">
<h2>{% trans 'Filter' %}</h2>
{% for spec in cl.filter_specs %}
{% if spec.filter_specs %}
{% admin_list_filter cl spec %}
<ul>
{% for sub_spec in spec.filter_specs %}
<li>{% admin_list_filter cl sub_spec %}</li>
{% endfor %}
</ul>
{% else %}
{% admin_list_filter cl spec %}
{% endif %}
{% endfor %}
</div>
{% endif %}
{% endblock %}
借用@ dima-kudosh的一些代码。
ChangeList.get_filters()
从ListFilter
创建ModelAdmin.list_filter
s(filter_specs),然后使用ListFilter.queryset()
到get_queryset()
。
FieldListFilter.queryset()
使用used_parameters
过滤查询集:queryset.filter(**self.used_parameters)
。
因此,我们可以从FieldListFilter
创建OrListFilter.fields
并使用他们的used_parameters
构建 OR 查询:
all_params = {}
for spec in self.get_filters(request, self.used_parameters):
if spec and spec.has_output():
all_params.update(spec.used_parameters)
try:
query_params = [Q((key, value)) for key, value in all_params.items()]
queryset = queryset.filter(reduce(operator.or_, query_params))
except TypeError as e:
pass
答案 3 :(得分:0)
Django Admin Multiple Choice List Filter是我通过搜索许多类似这样的帖子而编写的,旨在满足这一要求的Django应用。
MultipleChoiceListFilter扩展了SimpleListFilter,使您可以筛选多个选项。
用户界面使用可点击的链接来从“或”查询中“包含”和“排除”选择,而不是选中/取消选中复选框。因此,每次单击后,您都必须等待服务器往返,并刷新页面。这可能是性能/ UX问题,尤其是对于大量对象。
“全部”链接和每个选择链接的行为都保留在SimpleListFilter中-也就是说,您可以将过滤器重置为所有选择项,或仅重置其中一个选择项。
当前包含的选项在过滤器中突出显示(在下面的屏幕截图中以蓝色显示)。
该模板是可重写的,因此您可以根据需要更改界面。我个人认为,选择名称和包含/排除链接之间的空格可能会有助于区分两者。也许开关图标比单词“ include” /“ exclude”更直观。