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Djangoadminsite(二)ModelAdminmethods

2019-11-14 17:31:27
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ModelAdmin methods

save_model(request, obj, form, change)

此方法為admin界面用戶保存model實例時的行為。request為HttPRequest實例,obj為model實例,form為ModelForm實例,change為bool值,取決于model實例是新增的還是修改的。

重寫此方法可以做一些pre-save或者post-save行為。

比如,可以把request.user保存為model實例的屬性:

from django.contrib import adminclass ArticleAdmin(admin.ModelAdmin):    def save_model(self, request, obj, form, change):        obj.user = request.user        obj.save()

delete_model(request, obj)

admin界面用戶刪除model實例時的方法。

save_formset(request, form, formset, change)

admin界面用戶保存formset的方法,可以改寫:

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)

 可以定制查詢結果。

save_related(request, form, formsets, change)

formsets是model的inline formsets的列表。model的相關對象保存時的行為。

    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)

返回只讀字段。

get_prepopulated_fields(request, obj=None)

返回預置字段。

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對象的列表或元組

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方法的路徑就是 /admin/myapp/mymodel/my_view/ 。

不過上面的例子中無驗證和緩存,要提供驗證和緩存:

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

如果頁面可緩存而還是要進行權限驗證:

(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。下面用戶非superuser時會隱藏一些字段。

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中展示一個特殊的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中展示一個特殊的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字段使用的默認formfield. 根據不同的用戶返回不同的子集:

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)

類似于formfield_for_foreignkey,這個方法用于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)
類似于formfield_for_foreignkey和formfield_for_manytomany,這個方法用于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頁面使用的Changelis類. 缺省django.contrib.admin.views.main.ChangeList。

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

from django import formsclass MyForm(forms.ModelForm):    passclass MyModelAdmin(admin.ModelAdmin):    def get_changelist_form(self, request, **kwargs):        return MyForm

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

from django.forms.models import BaseModelFormSetclass MyAdminFormSet(BaseModelFormSet):    passclass 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權限。

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

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

ModelAdmin.get_queryset(request)
返回admin界面可編輯的model QuerySet集。 根據不同的user返回不同的結果:

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的用戶發送信息。

ModelAdmin.get_paginator(queryset, per_page, orphans=0, allow_empty_first_page=True)
返回一個分頁實例。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)
決定add_view()的HttpResponse,model被創建后運行。

ModelAdmin.response_change(request, obj)
決定change_view()的HttpResponse,model被修改后運行。

ModelAdmin.response_delete(request, obj_display)
決定delete_view()的HttpResponse,model被刪除后運行。

obj_display是被刪除對象的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.

這5個方法是被實際的設定為django的view方法的。可以重構,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

為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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