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django admin 扩展
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添加自定义动作：
例子，添加一个方法，批量更新文章，代码如下:
from django.contrib import admin
from myapp.models import Article def make_published(self, request, queryset):
rows_updated = queryset.update(status=’p’)
if rows_updated == 1:
message_bit = "1 story was"
else:
message_bit = "%s stories were" % rows_updated
self.message_user(request, "%s successfully marked as published." % message_bit) class ArticleAdmin(admin.ModelAdmin):
list_display = [’title’, ’status’]
ordering = [’title’]
actions = [make_published] admin.site.register(Article, ArticleAdmin)
效果如下：
自定义动作的权限控制，重载get_actions方法，如下：（只允许名字以J大头的删除记录）
from django.contrib import admin
from myapp.models import Article def make_published(self, request, queryset):
rows_updated = queryset.update(status=’p’)
if rows_updated == 1:
message_bit = "1 story was"
else:
message_bit = "%s stories were" % rows_updated
self.message_user(request, "%s successfully marked as published." % message_bit) class ArticleAdmin(admin.ModelAdmin):
list_display = [’title’, ’status’]
ordering = [’title’]
actions = [make_published] def get_actions(self, request):
actions = super(MyModelAdmin, self).get_actions(request)
if request.user.username[0].upper() != ’J’:
if ’delete_selected’ in actions:
del actions[’delete_selected’]
return actions
是不是一定要在admin.py中实现ModelAdmin的子类呢？
不一定，如果你觉得默认的ok，那么可以这样注册你的model，
admin.site.register(YourModel)
ModelAdmin api详解：
django (648~?)
ModelAdmin.save_model
原始实现
如下（仅仅保存模型实例）C:\Python27\Lib\site-packages\django\contrib\admin\options.py 856～860行
def save_model(self, request, obj, form, change):
"""
Given a model instance save it to the database.
"""
obj.save()
参数说明：
request - HttpRequest
obj - model.Models的子类的实例
form - ModelForm的实例
change - 布尔类型，标识是修改还是新增obj。
应用：
在obj.save之前或者之后做一些操作。
ModelAdmin.delete_model
原始实现
如下（仅仅删除模型实例）C:\Python27\Lib\site-packages\django\contrib\admin\options.py 862～866行
def delete_model(self, request, obj):
"""
Given a model instance delete it from the database.
"""
obj.delete()
参数说明：
request - HttpRequest
obj - model.Models的子类的实例
应用：
在obj.delete()之前或者之后做一些操作。
ModelAdmin.save_formset
原始实现
如下（仅仅保存formset）C:\Python27\Lib\site-packages\django\contrib\admin\options.py 868～872行
def save_formset(self, request, form, formset, change):
"""
Given an inline formset save it to the database.
"""
formset.save()
参数说明：
request - HttpRequest
form - ModelForm的实例
formset - ModelFormSet的实例
change - 布尔类型，标识是修改还是新增obj。
应用：
在formset.save之前或者之后做一些操作。
例子：
保存之前记录操作用户
class ArticleAdmin(admin.ModelAdmin):
def save_formset(self, request, form, formset, change):
instances = formset.save(commit=False)
for instance in instances:
instance.user = request.user
instance.save()
formset.save_m2m()
ModelAdmin.get_ordering
原始实现
如下（仅仅保存formset）C:\Python27\Lib\site-packages\django\contrib\admin\options.py 251～255行
def get_ordering(self, request):
"""
Hook for specifying field ordering.
"""
return self.ordering or () # otherwise we might try to *None, which is bad ;)
参数说明：
request - HttpRequest
返回值：类似ordering属性的元组或者列表
应用：
动态排序，可根据request里面的变量进行动态排序。
ModelAdmin.get_search_results(request,queryset,search_term)
原始实现
def get_search_results(self, request, queryset, search_term):
"""
Returns a tuple containing a queryset to implement the search,
and a boolean indicating if the results may contain duplicates.
"""
# Apply keyword searches.
def construct_search(field_name):
if field_name.startswith('^'):
return "%s__istartswith" % field_name[1:]
elif field_name.startswith('='):
return "%s__iexact" % field_name[1:]
elif field_name.startswith('@'):
return "%s__search" % field_name[1:]
else:
return "%s__icontains" % field_name use_distinct = False
if self.search_fields and search_term:
orm_lookups = [construct_search(str(search_field))
for search_field in self.search_fields]
for bit in search_term.split():
or_queries = [models.Q(**{orm_lookup: bit})
for orm_lookup in orm_lookups]
queryset = queryset.filter(reduce(operator.or_, or_queries))
if not use_distinct:
for search_spec in orm_lookups:
if lookup_needs_distinct(self.opts, search_spec):
use_distinct = True
break return queryset, use_distinct
参数说明：
request - HttpRequest
queryset - queryset
search_term - 字符串，以空格隔开
返回值：(queryset,is_distinct)
应用：
重载以实现个性化搜索。
例子：
实现整型数据的搜索支持
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,
try:
search_term_as_int = int(search_term)
except ValueError:
pass
else:
queryset |= self.model.objects.filter(age=search_term_as_int)
return queryset, use_distinct
