如何在Django ModelAdmin中创建和保存动态字段? [英] How do I create and save dynamic fields in Django ModelAdmin?
问题描述
我有一些模型:
class GroupType(models.Model):
name = models.CharField max_length = 255)
class Group(models.Model):
name = models.CharField(max_length = 255)
group_type = models.ForeignKey(GroupType)
class Person(models.Model):
name = models.CharField(max_length = 255)
groups = models.ManyToManyField(Group,related_name =+)
但是,在ModelAdmin中,我想为每个组类型动态添加字段。所以如果我有两个组类型 public
, private
,我希望管理表单显示两个字段 public_groups
和 private_groups
而不是实际的db字段组
。 p>
更多信息
我尝试创建一个自定义窗体来动态添加字段:
class PersonAdminForm(forms.ModelForm):
def __init __(self,* args,** kwargs)
super(PersonAdminForm,self).__ init __(* args,** kwargs)
new_fields = {}
GroupType.objects.all()中的group_type:
field_name = {0} _groups.format(group_type.name.lower())
qs = Group.objects.filter(group_type = group_type)
field_field = forms.ModelMultipleChoiceField(queryset = qs)
new_fields [field_name] = field_field
self.fields.update(new_fields)
class Meta:
model = Person
fields ='__all__'
在将表单添加到字段中,似乎可以做到这一点。但是保存这些字段并将它们添加到 PersonAdmin
中不起作用。如果我将明确的字段添加到 PersonAdmin
中的字段
属性中,我得到:
FieldError:为Person指定的未知字段(public_groups,private_groups)。检查PersonAdmin类的字段/ fieldsets / exclude属性。
当尝试通过自定义<$ c $动态添加 c> get_formsets 方法:
def get_fieldsets(self,request,obj = None):
fieldsets = super(PersonAdmin,self).get_fieldsets(request,obj)
print(self.form.fields)
fieldsets [0] [1] ['fields']。 public_groups','private_groups'])
return fieldsets
以下代码运行良好。 ModelForm
中覆盖的 __ init __
和 clean
方法添加动态字段并定义如何保存值。
被覆盖的 get_form
和 get_fieldsets
连同 AdminModel
上的 fieldsets
属性确保动态表单字段显示在
class PersonAdminForm(forms.ModelForm):
def __init __(self,* args,** kwargs )
super(PersonAdminForm,self).__ init __(* args,** kwargs)
new_fields = {}
initial = self.instance.groups.all()
for group_type_objects.all()中的group_type:
field_name ='{0} _groups'.format(group_type.name.lower())
qs = Group.objects.filter(group_type = group_type)
field = forms.ModelMultipleChoiceField(
queryset = qs,
required = False,
初始=初始,
)
new_fields [field_name] =字段
self.fields.update(new_fields)
def clean(self):
cleaning_data = super(PersonAdminForm,self).clean()
groups = []
GroupType.objects.all()中的group_type:
gt_name ='{0} _groups'.format(group_type .name.lower())
groups.extend(clean_data.get(gt_name))
self.instance.groups.clear()
self.instance.groups.add(* groups)
return clean_data
class Meta:
model = Person
fields ='__all__'
@ admin.register( Person)
class PersonAdmin(admin.ModelAdmin):
form = PersonAdminForm
#使用fieldsets属性而不是字段为动态
#添加组类型字段后来。
fieldsets =(
(无,{
'fields':(
'name',
),
}),
)
def get_form(self,request,obj = None,** kwargs):
kwargs ['fields'] = flatten_fieldsets(self.declared_fieldsets)
return super(PersonAdmin,自己).get_form(request,obj,** kwargs)
def get_fieldsets(self,request,obj = None):
fieldsets = super(PersonAdmin,self).get_fieldsets(request, obj)
newfieldsets = list(fieldsets)
fields = []
GroupType.objects.all()中的group_type:
fields.append('{0} _groups'。 format(group_type.name.lower()))
newfieldsets.append(['Groups',{'fields':fields}])
return newfieldsets
I have some models:
class GroupType(models.Model):
name = models.CharField(max_length=255)
class Group(models.Model):
name = models.CharField(max_length=255)
group_type = models.ForeignKey(GroupType)
class Person(models.Model):
name = models.CharField(max_length=255)
groups = models.ManyToManyField(Group, related_name="+")
But in the ModelAdmin I'd like to dynamically add fields for each group type. So if I have two group types public
, private
, I'd like the admin form to show two fields public_groups
and private_groups
instead of the actual db field groups
.
More Info
I've tried creating a custom form to add the fields dynamically:
class PersonAdminForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
super(PersonAdminForm, self).__init__(*args, **kwargs)
new_fields = {}
for group_type in GroupType.objects.all():
field_name = "{0}_groups".format(group_type.name.lower())
qs = Group.objects.filter(group_type=group_type)
field_field = forms.ModelMultipleChoiceField(queryset=qs)
new_fields[field_name] = field_field
self.fields.update(new_fields)
class Meta:
model = Person
fields = '__all__'
Which seems to do the trick as far as adding the fields to the form. But saving those fields and and adding them to the PersonAdmin
doesn't work. If I add the fields explicitly to the fields
attribute on the PersonAdmin
I get:
FieldError: Unknown field(s) (public_groups, private_groups) specified for Person. Check fields/fieldsets/exclude attributes of class PersonAdmin.
I also get the same thing when trying to add them "dynamically" through a custom get_formsets
method:
def get_fieldsets(self, request, obj=None):
fieldsets = super(PersonAdmin, self).get_fieldsets(request, obj)
print(self.form.fields)
fieldsets[0][1]['fields'].extend(['public_groups', 'private_groups'])
return fieldsets
The following code worked perfectly. The overridden __init__
and clean
methods on the ModelForm
adds the dynamic fields and defines how the values should be saved.
The overridden get_form
and get_fieldsets
together with the fieldsets
attribute on the AdminModel
make sure the dynamic form fields get displayed in the admin.
class PersonAdminForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
super(PersonAdminForm, self).__init__(*args, **kwargs)
new_fields = {}
initial = self.instance.groups.all()
for group_type in GroupType.objects.all():
field_name = '{0}_groups'.format(group_type.name.lower())
qs = Group.objects.filter(group_type=group_type)
field = forms.ModelMultipleChoiceField(
queryset=qs,
required=False,
initial=initial,
)
new_fields[field_name] = field
self.fields.update(new_fields)
def clean(self):
cleaned_data = super(PersonAdminForm, self).clean()
groups = []
for group_type in GroupType.objects.all():
gt_name = '{0}_groups'.format(group_type.name.lower())
groups.extend(cleaned_data.get(gt_name))
self.instance.groups.clear()
self.instance.groups.add(*groups)
return cleaned_data
class Meta:
model = Person
fields = '__all__'
@admin.register(Person)
class PersonAdmin(admin.ModelAdmin):
form = PersonAdminForm
# using the fieldsets attribute instead of fields in order to dynamically
# add group type fields later.
fieldsets = (
(None, {
'fields': (
'name',
),
}),
)
def get_form(self, request, obj=None, **kwargs):
kwargs['fields'] = flatten_fieldsets(self.declared_fieldsets)
return super(PersonAdmin, self).get_form(request, obj, **kwargs)
def get_fieldsets(self, request, obj=None):
fieldsets = super(PersonAdmin, self).get_fieldsets(request, obj)
newfieldsets = list(fieldsets)
fields = []
for group_type in GroupType.objects.all():
fields.append('{0}_groups'.format(group_type.name.lower()))
newfieldsets.append(['Groups', {'fields': fields}])
return newfieldsets
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