本文介绍了如何覆盖在list_filter中给出过滤器的查询器?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧! 问题描述 给定以下模型 class AnotherModel(models.Model):n = models.IntegerField() class MyModel(models.Model): somefield = models.ForeignKey(AnotherModel) 和admin class MyModelAdmin(admin.ModelAdmin): list_filter =('somefield' ,) 如何过滤 AnotherModel 只显示管理员过滤器中给定的 n 值的那些 我需要像: / p> 过滤器 By somefield all [给定n的AnotherModel实例的列表] 解决方案请参阅 ModelAdmin.queryset 和 ModelAdmin.formfield_for_foreignkey 。从文档中: ModelAdmin上的查询方法返回可由管理站点编辑的所有模型实例的QuerySet。覆盖此方法的一个用例是显示登录用户拥有的对象: class MyModelAdmin(admin.ModelAdmin): def queryset(self,request): qs = super(MyModelAdmin,self).queryset(request)如果request.user.is_superuser: return qs return qs.filter(author = request.user) ModelAdmin上的formfield_for_foreignkey方法允许您覆盖外键字段的默认表单域。例如,根据用户返回该外键字段的对象子集: class MyModelAdmin(admin.ModelAdmin): def formfield_for_foreignkey(self,db_field,request,** kwargs):如果db_field.name ==car: kwargs [queryset ] = Car.objects.filter(owner = request.user) return super(MyModelAdmin,self).formfield_for_foreignkey(db_field,request,** kwargs) 这使用HttpRequest实例过滤汽车外键字段,只显示用户实例拥有的汽车。 [更新] 对不起,我没有阅读过滤器部分。在Django> = 1.4中,您可以在 django.contrib.admin.SimpleListFilter 的子类dev / ref / contrib / admin /#django.contrib.admin.ModelAdmin.list_filterrel =nofollow noreferrer> list_filter参数列表,您可以使用它来覆盖查找和查询方法。从django.contrib导入admin 从django.utils.translation中获取 从datetime导入日期 导入ugettext_lazy为_ 类DecadeBornListFilter(admin.SimpleListFilter):#人类可读的标题将显示在#右侧管理员侧边栏上方的过滤器选项上方。 title = _('decade born') #在URL查询中使用的过滤器的参数。 parameter_name ='decade' def lookups(self,request,model_admin):返回一个元组列表,每个 tuple是出现在URL查询中的选项的编码值,第二个元素是可读的名称,该选项将在右侧栏中显示 return(('80s',_('在八十年代)),('90s',_('在九十年代' )) def queryset(self,request,queryset):返回过滤的查询集,基于查询字符串,并通过`self.value()`。#将请求的值('80s'或'90s')#决定如何过滤查询。 如果self.value()=='80s': return queryset.filter(birthday__gte = date(1980,1,1)) birthday__lte = date(1989,12,31) )如果self.value()=='90s': return queryset.filter(birthday__gte = date(1990,1,1), birthday__lte = date(1999,12,31 ) class PersonAdmin(admin.ModelAdmin): list_filter =(DecadeBornListFilter,) Given the following modelsclass AnotherModel(models.Model): n = models.IntegerField()class MyModel(models.Model): somefield = models.ForeignKey(AnotherModel)and adminclass MyModelAdmin(admin.ModelAdmin): list_filter = ('somefield',)how can I filter the instances of AnotherModel to show only those with a given n value in my admin filter?I need something like:FilterBy somefieldall[list of AnotherModel instances with given n] 解决方案 See ModelAdmin.queryset and ModelAdmin.formfield_for_foreignkey. From the docs: The queryset method on a ModelAdmin returns a QuerySet of all model instances that can be edited by the admin site. One use case for overriding this method is to show objects owned by the logged-in user:class MyModelAdmin(admin.ModelAdmin): def queryset(self, request): qs = super(MyModelAdmin, self).queryset(request) if request.user.is_superuser: return qs return qs.filter(author=request.user) The formfield_for_foreignkey method on a ModelAdmin allows you to override the default formfield for a foreign keys field. For example, to return a subset of objects for this foreign key field based on the user:class MyModelAdmin(admin.ModelAdmin): def formfield_for_foreignkey(self, db_field, request, **kwargs): if db_field.name == "car": kwargs["queryset"] = Car.objects.filter(owner=request.user) return super(MyModelAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs) This uses the HttpRequest instance to filter the Car foreign key field to only display the cars owned by the User instance.[update]Sorry, I failed to read the "filter" part. In Django >= 1.4 you can pass a subclass of django.contrib.admin.SimpleListFilter in the list_filter argument list, which you can use in order to override the lookups and queryset methods.from datetime import datefrom django.contrib import adminfrom django.utils.translation import ugettext_lazy as _class DecadeBornListFilter(admin.SimpleListFilter): # Human-readable title which will be displayed in the # right admin sidebar just above the filter options. title = _('decade born') # Parameter for the filter that will be used in the URL query. parameter_name = 'decade' def lookups(self, request, model_admin): """ Returns a list of tuples. The first element in each tuple is the coded value for the option that will appear in the URL query. The second element is the human-readable name for the option that will appear in the right sidebar. """ return ( ('80s', _('in the eighties')), ('90s', _('in the nineties')), ) def queryset(self, request, queryset): """ Returns the filtered queryset based on the value provided in the query string and retrievable via `self.value()`. """ # Compare the requested value (either '80s' or '90s') # to decide how to filter the queryset. if self.value() == '80s': return queryset.filter(birthday__gte=date(1980, 1, 1), birthday__lte=date(1989, 12, 31)) if self.value() == '90s': return queryset.filter(birthday__gte=date(1990, 1, 1), birthday__lte=date(1999, 12, 31))class PersonAdmin(admin.ModelAdmin): list_filter = (DecadeBornListFilter,) 这篇关于如何覆盖在list_filter中给出过滤器的查询器?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!
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