Djangoadminsite(二)ModelAdminmethods

ModelAdmin methods

save_model(request, obj, form, change)

此方法为admin界面用户保存model实例时的行为。request为HttPRequest实例，obj为model实例，form为ModelForm实例，change为bool值，取决于model实例是新增的还是修改的。

重写此方法可以做一些pre-save或者post-save行为。

比如，可以把request.user保存为model实例的属性：

from django.contrib import admin

class ArticleAdmin(admin.ModelAdmin):
   def save_model(self, request, obj, form, change):
       obj.user = request.user
       obj.save()

delete_model(request, obj)

admin界面用户删除model实例时的方法。

save_formset(request, form, formset, change)

admin界面用户保存formset的方法，可以改写：

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()

get_ordering(request)

排序。

class PersonAdmin(admin.ModelAdmin):

   def get_ordering(self, request):
       if request.user.is_superuser:
           return ['name', 'rank']
       else:
           return ['name']

get_search_results(request, queryset, search_term)

 可以定制查询结果。

save_related(request, form, formsets, change)

formsets是model的inline formsets的列表。model的相关对象保存时的行为。

   def save_related(self, request, form, formsets, change):
       """
       Given the ``HttpRequest``, the parent ``ModelForm`` instance, the
       list of inline formsets and a boolean value based on whether the
       parent is being added or changed, save the related objects to the
       database. Note that at this point save_form() and save_model() have
       already been called.
       """
       form.save_m2m()
       for formset in formsets:
           self.save_formset(request, form, formset, change=change)

get_readonly_fields(request, obj=None)

返回只读字段。

get_prepopulated_fields(request, obj=None)

返回预置字段。

get_list_display(request)

返回list_display。

get_list_display_links(request, list_display)

返回list_display_link。

get_fields(request, obj=None)
返回fields。

get_fieldsets(request, obj=None)
返回fieldsets。

get_list_filter(request)
返回list_filter。

get_search_fields(request)
返回search_fields。

get_inline_instances(request, obj=None)
返回InlineModelAdmin对象的列表或元组

class MyModelAdmin(admin.ModelAdmin):
   def get_inline_instances(self, request, obj=None):
       return [inline(self.model, self.admin_site) for inline in self.inlines]

get_urls()
返回ModelAdmin的可用urls。

class MyModelAdmin(admin.ModelAdmin):
   def get_urls(self):
       urls = super(MyModelAdmin, self).get_urls()
       my_urls = patterns('',
           (r'^my_view/$', self.my_view)
       )
       return my_urls + urls

   def my_view(self, request):
       # custom view which should return an HttpResponse
       pass

上面my_view方法的路径就是 /admin/myapp/mymodel/my_view/ 。

不过上面的例子中无验证和缓存，要提供验证和缓存：

class MyModelAdmin(admin.ModelAdmin):
   def get_urls(self):
       urls = super(MyModelAdmin, self).get_urls()
       my_urls = patterns('',
           (r'^my_view/$', self.admin_site.admin_view(self.my_view))
       )
       return my_urls + urls

如果页面可缓存而还是要进行权限验证：

(r'^my_view/$', self.admin_site.admin_view(self.my_view, cacheable=True))

get_form(request, obj=None, **kwargs)

返回add和change view使用的ModelForm。下面用户非superuser时会隐藏一些字段。

class MyModelAdmin(admin.ModelAdmin):
   def get_form(self, request, obj=None, **kwargs):
       self.exclude = []
       if not request.user.is_superuser:
           self.exclude.append('field_to_hide')
       return super(MyModelAdmin, self).get_form(request, obj, **kwargs)

get_formsets(request, obj=None)

Yields InlineModelAdmins for use in admin add and change views.

如果只想在the change view中展示一个特殊的inline：

class MyModelAdmin(admin.ModelAdmin):
   inlines = [MyInline, SomeOtherInline]

   def get_formsets(self, request, obj=None):
       for inline in self.get_inline_instances(request, obj):
           # hide MyInline in the add view
           if isinstance(inline, MyInline) and obj is None:
               continue
           yield inline.get_formset(request, obj)

get_formsets_with_inlines(request, obj=None)

Yields (FormSet, InlineModelAdmin) pairs for use in admin add and change views.

如果只想在the change view中展示一个特殊的inline：

class MyModelAdmin(admin.ModelAdmin):
   inlines = [MyInline, SomeOtherInline]

   def get_formsets_with_inlines(self, request, obj=None):
       for inline in self.get_inline_instances(request, obj):
           # hide MyInline in the add view
           if isinstance(inline, MyInline) and obj is None:
               continue
           yield inline.get_formset(request, obj), inline

formfield_for_foreignkey(db_field, request, **kwargs)
Foreignkey字段使用的默认formfield. 根据不同的用户返回不同的子集：

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)

formfield_for_manytomany(db_field, request, **kwargs)

类似于formfield_for_foreignkey，这个方法用于many to many字段.：

class MyModelAdmin(admin.ModelAdmin):
   def formfield_for_manytomany(self, db_field, request, **kwargs):
       if db_field.name == "cars":
           kwargs["queryset"] = Car.objects.filter(owner=request.user)
       return super(MyModelAdmin, self).formfield_for_manytomany(db_field, request, **kwargs)

ModelAdmin.formfield_for_choice_field(db_field, request, **kwargs)
类似于formfield_for_foreignkey和formfield_for_manytomany,这个方法用于choices：

class MyModelAdmin(admin.ModelAdmin):
   def formfield_for_choice_field(self, db_field, request, **kwargs):
       if db_field.name == "status":
           kwargs['choices'] = (
               ('accepted', 'Accepted'),
               ('denied', 'Denied'),
           )
           if request.user.is_superuser:
               kwargs['choices'] += (('ready', 'Ready for deployment'),)
       return super(MyModelAdmin, self).formfield_for_choice_field(db_field, request, **kwargs)

ModelAdmin.get_changelist(request, **kwargs)
返回changelist页面使用的Changelis类. 缺省django.contrib.admin.views.main.ChangeList。

ModelAdmin.get_changelist_form(request, **kwargs)
返回changelist页面使用的ModelForm类。

from django import forms

class MyForm(forms.ModelForm):
   pass

class MyModelAdmin(admin.ModelAdmin):
   def get_changelist_form(self, request, **kwargs):
       return MyForm

ModelAdmin.get_changelist_formset(request, **kwargs)
返回changelist页面使用的ModelFormSet类。

from django.forms.models import BaseModelFormSet

class MyAdminFormSet(BaseModelFormSet):
   pass

class MyModelAdmin(admin.ModelAdmin):
   def get_changelist_formset(self, request, **kwargs):
       kwargs['formset'] = MyAdminFormSet
       return super(MyModelAdmin, self).get_changelist_formset(request, **kwargs)

ModelAdmin.has_add_permission(request)
是否具有add权限。

ModelAdmin.has_change_permission(request, obj=None)
是否具有change权限。

ModelAdmin.has_delete_permission(request, obj=None)
是否具有delete权限。

ModelAdmin.get_queryset(request)
返回admin界面可编辑的model QuerySet集。 根据不同的user返回不同的结果：

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)

ModelAdmin.message_user(request, message, level=messages.INFO, extra_tags='', fail_silently=False)
向使用django.contrib.messages backend的用户发送信息。

ModelAdmin.get_paginator(queryset, per_page, orphans=0, allow_empty_first_page=True)
返回一个分页实例。Returns an instance of the paginator to use for this view. By default, instantiates an instance of paginator.

ModelAdmin.response_add(request, obj, post_url_continue=None)
决定add_view()的HttpResponse，model被创建后运行。

ModelAdmin.response_change(request, obj)
决定change_view()的HttpResponse，model被修改后运行。

ModelAdmin.response_delete(request, obj_display)
决定delete_view()的HttpResponse，model被删除后运行。

obj_display是被删除对象的name。

ModelAdmin.get_changeform_initial_data(request)
A hook for the initial data on admin change forms. By default, fields are given initial values from GET parameters. For instance, ?name=initial_value will set the name field’s initial value to be initial_value.

This method should return a dictionary in the form {'fieldname': 'fieldval'}:

def get_changeform_initial_data(self, request):
   return {'name': 'custom_initial_value'}

Other methods

ModelAdmin.add_view(request, form_url='', extra_context=None)
Django view for the model instance addition page. See note below.

ModelAdmin.change_view(request, object_id, form_url='', extra_context=None)
Django view for the model instance edition page. See note below.

ModelAdmin.changelist_view(request, extra_context=None)
Django view for the model instances change list/actions page. See note below.

ModelAdmin.delete_view(request, object_id, extra_context=None)
Django view for the model instance(s) deletion confirmation page. See note below.

ModelAdmin.history_view(request, object_id, extra_context=None)
Django view for the page that shows the modification history for a given model instance.

这5个方法是被实际的设定为django的view方法的。可以重构，一般是添加渲染view使用的模板的context data：

class MyModelAdmin(admin.ModelAdmin):

   # A template for a very customized change view:
   change_form_template = 'admin/myapp/extras/openstreetmap_change_form.html'

   def get_osm_info(self):
       # ...
       pass

   def change_view(self, request, object_id, form_url='', extra_context=None):
       extra_context = extra_context or {}
       extra_context['osm_data'] = self.get_osm_info()
       return super(MyModelAdmin, self).change_view(request, object_id,
           form_url, extra_context=extra_context)

 ModelAdmin asset definitions

为ModelAdmin的 add/change views添加js和CSS：

class ArticleAdmin(admin.ModelAdmin):
   class Media:
       css = {
           "all": ("my_styles.css",)
       }
       js = ("my_code.js",)

Adding custom validation to the admin

定制form：

class MyArticleAdminForm(forms.ModelForm):
   def clean_name(self):
       # do something that validates your data
       return self.cleaned_data["name"]
class ArticleAdmin(admin.ModelAdmin):
   form = MyArticleAdminForm

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