Python 添加新的额外数据时获取django ChildInline父模型字段值
作为实现我的目标的另一种方法,如所述:,即:将动态默认字段值设置为内联的“localwant”子字段,该子字段等于其父级等效的“remotewant” 我有以下两种型号:Python 添加新的额外数据时获取django ChildInline父模型字段值,python,django,django-admin,Python,Django,Django Admin,作为实现我的目标的另一种方法,如所述:,即:将动态默认字段值设置为内联的“localwant”子字段,该子字段等于其父级等效的“remotewant” 我有以下两种型号: #models.py class Parent(models.Model): id = UUIDField(primary_key=True) remotewanted = models.CharField(max_length=100) class Child(models.Model
#models.py
class Parent(models.Model):
id = UUIDField(primary_key=True)
remotewanted = models.CharField(max_length=100)
class Child(models.Model):
parent = models.ForeignKey(Parent)
localwanted = models.CharField(max_length=100)
def parent_remotewanted(self):
return self.parent.remotewanted
如果我希望local默认为“AAA”:
#admin.py
class ChildForm(forms.ModelForm):
class Meta:
model = Child
exclude = []
def __init__(self, *args, **kwargs):
super(ChildForm, self).__init__(*args, **kwargs)
self.initial['localwanted'] = "AAA"
class ChildInline(admin.TabularInline):
model = Child
extra = 1
form = ChildForm
class ParentAdmin(admin.ModelAdmin):
exclude = []
inlines = [ChildInline]
#list_display, etc
admin.site.register(Parent,ParentAdmin)
它可以工作,额外的字段(这里只有一个)显示:“AAA”
但是
如果希望此默认值是动态的(即父变量),请使用self.instance.parent\u remotewant替换“AAA”,如下所示(在子窗体类中):
它什么也不显示
然后
尝试直接处理Parent.objects,我的第二次尝试与其他方法相同:
两者都显示“匹配查询不存在”,DEBUG=TEMPLATE\u DEBUG=True。
我开始意识到ChildForminit函数的确切功能。而且它似乎处理的是要实现的结构,而不是有效的目标
问题
从这里有什么事要做吗?
我的方法是死路一条吗?实例。父标识是一个函数,所以您必须实际调用它
def __init__(self, *args, **kwargs):
super(ChildForm, self).__init__(*args, **kwargs)
self.initial['localwanted'] = self.instance.parent_identity() #<----------------
def\uuuu init\uuuu(self,*args,**kwargs):
super(子窗体,self)。\uuuuuu初始化(*args,**kwargs)
self.initial['localwanted']=self.instance.parent_identity()#谢谢。是的,它是一个函数,但现在不必调用它,因为父类此时没有实例化。我改变了我的视角,并以不同的方式进行了操作,正如这里所解释的:为了仅在实例化类对象时调用可调用对象,@property
装饰器是我的解决方案。
#models.py
class Child(models.Model):
parent = models.ForeignKey(Parent)
localwanted = models.CharField(max_length=100)
def parent_identity(self): #<----------------
return self.parent_id #<----------------
#admin.py
class ChildForm(forms.ModelForm):
class Meta:
model = Child
exclude = []
def __init__(self, *args, **kwargs):
super(ChildForm, self).__init__(*args, **kwargs)
self.initial['localwanted'] = self.instance.parent_identity #<----------------
>>print self.instance.parent_identity
<bound method Child.parent_identity of <Child: >> #<--what print function gives
obj = Parent.objects.get(id=self.instance.parent_identity)
# or
obj = Parent.objects.get(id=self.instance.parent_identity.__self__)
def __init__(self, *args, **kwargs):
super(ChildForm, self).__init__(*args, **kwargs)
self.initial['localwanted'] = self.instance.parent_identity() #<----------------