Django admin的一些有用定制
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Model实例,myapp/models.py:
from django.db import modelsclass Blog(models.Model):name = models.CharField(max_length=100)tagline = models.TextField() # On Python 3: def __str__(self):def __unicode__(self):return self.name class Author(models.Model):name = models.CharField(max_length=50)email = models.EmailField() # On Python 3: def __str__(self):def __unicode__(self):return self.name class Entry(models.Model):blog = models.ForeignKey(Blog)headline = models.CharField(max_length=255)body_text = models.TextField()pub_date = models.DateField()mod_date = models.DateField()authors = models.ManyToManyField(Author)n_comments = models.IntegerField()n_pingbacks = models.IntegerField()rating = models.IntegerField() # On Python 3: def __str__(self):def __unicode__(self):return self.headline
类级别权限
默认情况下,superuser可以访问admin界面的所有Model,但有时候只想让一些用户只能访问一些特定的Model。
可以定制自己的User对象的has_perm()方法:
class MyUser(AbstractBaseUser):...def has_perm(self, perm, obj=None):if self.is_superuser:return Trueelif self.can_edit:if perm=='myapp.add_entry':return Trueelse:return Falseelse:return False
这样superuser具有全部权限。普通user的can_edit属性为True时,就具有了创建Entry实例的权限,其余用户无权限。
也可以定制ModelAdmin的has_add_permission(),has_change_permission(),has_delete_permission()方法:
def has_add_permission(self, request):"""Returns True if the given request has permission to add an object.Can be overridden by the user in subclasses."""opts = self.optscodename = get_permission_codename('add', opts)if request.user.can_edit: return Trueelse: return request.user.has_perm("%s.%s" % (opts.app_label, codename))
字段级别的权限
不同权限的可以编辑不同的内容,可以通过get_readonly_fileds()来添加字段只读权限。
class EntryAdmin(admin.ModelAdmin):list_display=(...)search_fields=(...)def get_readonly_fields(self,request,obj=None):if not request.user.is_superuser and not request.user.can_edit:return [f.name for f in self.model._meta.fields]return self.readonly_fields
重写Model的save行为
可以直接重写model的save()方法:
from django.db import modelsclass Blog(models.Model):name = models.CharField(max_length=100)tagline = models.TextField()def save(self, *args, **kwargs):do_something()super(Blog, self).save(*args, **kwargs) # Call the "real" save() method.do_something_else()
阻止save():
from django.db import modelsclass Blog(models.Model):name = models.CharField(max_length=100)tagline = models.TextField()def save(self, *args, **kwargs):if self.name == "Yoko Ono's blog":return # Yoko shall never have her own blog!else:super(Blog, self).save(*args, **kwargs) # Call the "real" save() method.
也可以重写ModelAdmin的save_model()方法,根据不同的用户定制不同的save行为:
from django.contrib import adminclass ArticleAdmin(admin.ModelAdmin): def save_model(self, request, obj, form, change): obj.user = request.user obj.save()
其中obj是修改后的对象,当新建一个对象时 change = False, 当修改一个对象时 change = True,可以获得修改前的对象:
from django.contrib import adminclass ArticleAdmin(admin.ModelAdmin):def save_model(self, request, obj, form, change):if change:obj_old = self.model.objects.get(pk=obj.pk)else:obj_old = Noneobj.user = request.userobj.save()
不同的用户显示不同的数据行,重写列表页面返回的查询集
ModelAdmin 提供了一个钩子程序 —— 它有一个名为 queryset()
的方法,该方法可以确定任何列表页面返回的默认查询集。
class MyModelAdmin(admin.ModelAdmin): def get_queryset(self, request): qs = super(MyModelAdmin, self).get_queryset(request) if request.user.is_superuser: return qs return qs.filter(author=request.user)
定制过滤器list_filter
从django.contrib.admin.SimpleListFilter继承一个子类,提供title和parameter_name属性,并重写 lookups和queryset方法。
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 eachtuple is the coded value for the option that willappear in the URL query. The second element is thehuman-readable name for the option that will appearin the right sidebar."""return (('80s', _('in the eighties')),('90s', _('in the nineties')),)def queryset(self, request, queryset):"""Returns the filtered queryset based on the valueprovided 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,)
parameter_name和title是必须的。look_up方法返回出现在列表页右侧过滤器中的选项和描述。parameter_name为附加在url后面get请求的参数名,self.value()返回该参数对应的值。
根据不同的用户定制:
class AuthDecadeBornListFilter(DecadeBornListFilter):def lookups(self, request, model_admin):if request.user.is_superuser:return super(AuthDecadeBornListFilter,self).lookups(request, model_admin)def queryset(self, request, queryset):if request.user.is_superuser:return super(AuthDecadeBornListFilter,self).queryset(request, queryset)
model_admin为ModelAdmin实例:
class AdvancedDecadeBornListFilter(DecadeBornListFilter):def lookups(self, request, model_admin):"""Only show the lookups if there actually isanyone born in the corresponding decades."""qs = model_admin.get_queryset(request)if qs.filter(birthday__gte=date(1980, 1, 1), birthday__lte=date(1989, 12, 31)).exists():yield ('80s', _('in the eighties'))if qs.filter(birthday__gte=date(1990, 1, 1), birthday__lte=date(1999, 12, 31)).exists():yield ('90s', _('in the nineties'))
定制搜索功能
class PersonAdmin(admin.ModelAdmin):list_display = ('name', 'age')search_fields = ('name',)def get_search_results(self, request, queryset, search_term):queryset, use_distinct = super(PersonAdmin, self).get_search_results(request, queryset, search_term)try:search_term_as_int = int(search_term)except ValueError:passelse:queryset |= self.model.objects.filter(age=search_term_as_int)return queryset, use_distinct
queryset是查询集,search_term是搜索词。
外键字段过滤
在添加对象时显示外键选项时,太多的选项不太友好,这时候需要过滤出符合要求的对象供选择。
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, req
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