Django admin site(二)ModelAdmin methods
作者：互联网
原文：https://www.cnblogs.com/linxiyue/p/4074141.html
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：
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from django.contrib import admin
class ArticleAdmin(admin.ModelAdmin):
def save_model(self, request, obj, form, change):
obj.user = request.user
obj.save()
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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：
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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()
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get_ordering(request)
排序。
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class PersonAdmin(admin.ModelAdmin):
def get_ordering(self, request):
if request.user.is_superuser:
return ['name', 'rank']
else:
return ['name']
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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。
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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)
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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
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class MyModelAdmin(admin.ModelAdmin):
def get_inline_instances(self, request, obj=None):
return [inline(self.model, self.admin_site) for inline in self.inlines]
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get_urls()
返回ModelAdmin的可用urls。
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class MyModelAdmin(admin.ModelAdmin):
def get_urls(self):
urls = super(MyModelAdmin, self).get_urls()
my_urls = patterns('',
(r'^my_view/$', self.my_view)
)
return my_urls + urls
def my_view(self, request):
# custom view which should return an HttpResponse
pass
|
上面my_view方法的路径就是 /admin/myapp/mymodel/my_view/ 。
不过上面的例子中无验证和缓存，要提供验证和缓存：
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class MyModelAdmin(admin.ModelAdmin):
def get_urls(self):
urls = super(MyModelAdmin, self).get_urls()
my_urls = patterns('',
(r'^my_view/$', 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：
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(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。
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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：
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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)
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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：
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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：
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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)
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formfield_for_manytomany(db_field, request, **kwargs)
类似于formfield_for_foreignkey，这个方法用于many to many字段.：
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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：
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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)
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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。
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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。
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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)
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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：
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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)
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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'}:
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def get_changeform_initial_data(self, request):
return {'name': 'custom_initial_value'}
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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：
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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：
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class ArticleAdmin(admin.ModelAdmin):
class Media:
css = {
"all": ("my_styles.css",)
}
js = ("my_code.js",)
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Adding custom validation to the admin
定制form：
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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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标签：methods,get,admin,self,request,site,ModelAdmin,view 来源： https://www.cnblogs.com/chdltanke/p/10365405.html