Djangoadminsite(三)InlineModelAdmin

InlineModelAdmin

class InlineModelAdmin
class TabularInline
class StackedInline

举例，有两个Model：

from django.db import models

class Author(models.Model):
  name = models.CharField(max_length=100)

class Book(models.Model):
  author = models.ForeignKey(Author)
  title = models.CharField(max_length=100)

如果想在Author页面上编辑book：

from django.contrib import admin

class BookInline(admin.TabularInline):
   model = Book

class AuthorAdmin(admin.ModelAdmin):
   inlines = [
       BookInline,
   ]

Django提供了两个InlineModelAdmin的子类:

TabularInline
StackedInline
区别在于使用的模板。

InlineModelAdmin options选项

InlineModelAdmin和ModelAdmin共通的options有：

form
fieldsets
fields
formfield_overrides
exclude
filter_horizontal
filter_vertical
ordering
PRepopulated_fields
get_queryset()
radio_fields
readonly_fields
raw_id_fields
formfield_for_choice_field()
formfield_for_foreignkey()
formfield_for_manytomany()
has_add_permission()
has_change_permission()
has_delete_permission()

额外增加的options有：

InlineModelAdmin.model
inline使用的model，必需。

InlineModelAdmin.fk_name
model的name，当有多个外键时使用。

InlineModelAdmin.formset
缺省BaseInlineFormSet。

InlineModelAdmin.form
缺省ModelForm。当创建formset时传递给inlineformset_factory()。

InlineModelAdmin.extra
inline的额外数目。

InlineModelAdmin.get_extra()也返回inline的额外数目。

InlineModelAdmin.max_num
可展示得最大数目。

InlineModelAdmin.get_max_num()也返回此数字。

InlineModelAdmin.min_num
可展示的最小数目。

InlineModelAdmin.get_min_num()也返回此数目。

InlineModelAdmin.raw_id_fields
同ModelAdmin。

class BookInline(admin.TabularInline):
   model = Book
   raw_id_fields = ("pages",)

InlineModelAdmin.template
使用的模板。

InlineModelAdmin.verbose_name
覆盖meta class中的verbose_name。

InlineModelAdmin.verbose_name_plural
同上

InlineModelAdmin.can_delete
默认为True。

InlineModelAdmin.get_formset(request, obj=None, **kwargs)
参考ModelAdmin.get_formsets_with_inlines.

InlineModelAdmin.get_extra(request, obj=None, **kwargs)

class BinaryTreeAdmin(admin.TabularInline):
   model = BinaryTree

   def get_extra(self, request, obj=None, **kwargs):
       extra = 2
       if obj:
           return extra - obj.binarytree_set.count()
       return extra

InlineModelAdmin.get_max_num(request, obj=None, **kwargs)

class BinaryTreeAdmin(admin.TabularInline):
   model = BinaryTree

   def get_max_num(self, request, obj=None, **kwargs):
       max_num = 10
       if obj.parent:
           return max_num - 5
       return max_num

InlineModelAdmin.get_min_num(request, obj=None, **kwargs)
见上。

多个 ForeignKey链向同一个Model的情况

如果有多个foreign keys：

from django.db import models

class Friendship(models.Model):
   to_person = models.ForeignKey(Person, related_name="friends")
   from_person = models.ForeignKey(Person, related_name="from_friends")

展示其中一个：

from django.contrib import admin
from myapp.models import Friendship

class FriendshipInline(admin.TabularInline):
   model = Friendship
   fk_name = "to_person"

class PersonAdmin(admin.ModelAdmin):
   inlines = [
       FriendshipInline,
   ]

Working with many-to-many models

model例子：

from django.db import models

class Person(models.Model):
   name = models.CharField(max_length=128)

class Group(models.Model):
   name = models.CharField(max_length=128)
   members = models.ManyToManyField(Person, related_name='groups')

inlines展示：

from django.contrib import admin

class MembershipInline(admin.TabularInline):
   model = Group.members.through

class PersonAdmin(admin.ModelAdmin):
   inlines = [
       MembershipInline,
   ]

class GroupAdmin(admin.ModelAdmin):
   inlines = [
       MembershipInline,
   ]
   exclude = ('members',)

Note：

第一 ， the MembershipInline类指向Group.members.through. The through attribute指向管理the many-to-many关系的数据库. 

第二，, the GroupAdmin 必须排除the members字段.

Working with many-to-many intermediary models

明确指出中间model的例子：

from django.db import models

class Person(models.Model):
   name = models.CharField(max_length=128)

class Group(models.Model):
   name = models.CharField(max_length=128)
   members = models.ManyToManyField(Person, through='Membership')

class Membership(models.Model):
   person = models.ForeignKey(Person)
   group = models.ForeignKey(Group)
   date_joined = models.DateField()
   invite_reason = models.CharField(max_length=64)

第一步：

class MembershipInline(admin.TabularInline):
   model = Membership
   extra = 1

第二步：

class PersonAdmin(admin.ModelAdmin):
   inlines = (MembershipInline,)

class GroupAdmin(admin.ModelAdmin):
   inlines = (MembershipInline,)

第三步：

admin.site.register(Person, PersonAdmin)
admin.site.register(Group, GroupAdmin)

Using generic relations as an inline

一个inline with generically related objects例子：

from django.db import models
from django.contrib.contenttypes.fields import GenericForeignKey

class Image(models.Model):
   image = models.ImageField(upload_to="images")
   content_type = models.ForeignKey(ContentType)
   object_id = models.PositiveIntegerField()
   content_object = GenericForeignKey("content_type", "object_id")

class Product(models.Model):
   name = models.CharField(max_length=100)

如果想在Product add/change页面上编辑Image实例，可以使用GenericTabularInline或GenericStackedInline：

from django.contrib import admin
from django.contrib.contenttypes.admin import GenericTabularInline

from myproject.myapp.models import Image, Product

class ImageInline(GenericTabularInline):
   model = Image

class ProductAdmin(admin.ModelAdmin):
   inlines = [
       ImageInline,
   ]

admin.site.register(Product, ProductAdmin)

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