在Django中的Tablerinline类中获取\u只读\u字段?
我试图在Django中的Tablerinline类中使用get_readonly_字段:在Django中的Tablerinline类中获取\u只读\u字段?,django,django-admin,Django,Django Admin,我试图在Django中的Tablerinline类中使用get_readonly_字段: class ItemInline(admin.TabularInline): model = Item extra = 5 def get_readonly_fields(self, request, obj=None): if obj: return ['name'] return self.readonly_fields
class ItemInline(admin.TabularInline):
model = Item
extra = 5
def get_readonly_fields(self, request, obj=None):
if obj:
return ['name']
return self.readonly_fields
此代码取自另一个StackOverflow问题:
但是,如果将其放入Tablerinline类中,则新的对象形式无法正确渲染。目标是使某些字段成为只读字段,同时仍允许在新对象中输入数据。有什么解决方法或不同策略的想法吗?你的思路是正确的。使用要设置为只读的字段的元组更新self.readonly_字段
class ItemInline(admin.TabularInline):
model = Item
extra = 5
def get_readonly_fields(self, request, obj=None):
# add a tuple of readonly fields
self.readonly_fields += ('field_a', 'field_b')
return self.readonly_fields
小心——“obj”不是内联对象,它是父对象。这可以说是一个bug—例如,请参见,由于obj是父模型实例,而不是内联显示的实例,因此这目前仍然不容易实现 为了解决这个问题,我做的是使内联表单中的所有字段都是只读的,并为内联模型提供一个到ChangeForm的添加/编辑链接 像这样
class ChangeFormLinkMixin(object):
def change_form_link(self, instance):
url = reverse('admin:%s_%s_change' % (instance._meta.app_label,
instance._meta.module_name), args=(instance.id,))
# Id == None implies and empty inline object
url = url.replace('None', 'add')
command = _('Add') if url.find('add') > -1 else _('Edit')
return format_html(u'<a href="{}">%s</a>' % command, url)
然后在ChangeForm中,我将能够以我想要的方式控制更改(我有几个状态,每个状态都有一组关联的可编辑字段)。作为解决此问题的方法,我将一个表单和一个小部件关联到我的内联: admin.py:
...
class MasterCouponFileInline(admin.TabularInline):
model = MasterCouponFile
form = MasterCouponFileForm
extra = 0
在Django 2.0中:
forms.py
from django import forms
from . import models
from feedback.widgets import DisablePopulatedText
class FeedbackCommentForm(forms.ModelForm):
class Meta:
model = models.MasterCouponFile
fields = ('Comment', ....)
widgets = {
'Comment': DisablePopulatedText,
}
....
class MasterCouponFileForm(forms.ModelForm):
class Meta:
model = MasterCouponFile
def __init__(self, *args, **kwargs):
super(MasterCouponFileForm, self).__init__(*args, **kwargs)
self.fields['range'].widget = DisablePopulatedText(self.instance)
self.fields['quantity'].widget = DisablePopulatedText(self.instance)
在widgets.py中
from django import forms
class DisablePopulatedText(forms.TextInput):
def render(self, name, value, attrs=None, renderer=None):
"""Render the widget as an HTML string."""
if value is not None:
# Just return the value, as normal read_only fields do
# Add Hidden Input otherwise the old fields are still required
HiddenInput = forms.HiddenInput()
return format_html("{}\n"+HiddenInput.render(name, value), self.format_value(value))
else:
return super().render(name, value, attrs, renderer)
...
from django import forms
from django.forms.util import flatatt
from django.utils.encoding import force_text
class DisablePopulatedText(forms.TextInput):
def __init__(self, obj, attrs=None):
self.object = obj
super(DisablePopulatedText, self).__init__(attrs)
def render(self, name, value, attrs=None):
if value is None:
value = ''
final_attrs = self.build_attrs(attrs, type=self.input_type, name=name)
if value != '':
# Only add the 'value' attribute if a value is non-empty.
final_attrs['value'] = force_text(self._format_value(value))
if "__prefix__" not in name and not value:
return format_html('<input{0} disabled />', flatatt(final_attrs))
else:
return format_html('<input{0} />', flatatt(final_attrs))
较旧的Django版本:
forms.py
from django import forms
from . import models
from feedback.widgets import DisablePopulatedText
class FeedbackCommentForm(forms.ModelForm):
class Meta:
model = models.MasterCouponFile
fields = ('Comment', ....)
widgets = {
'Comment': DisablePopulatedText,
}
....
class MasterCouponFileForm(forms.ModelForm):
class Meta:
model = MasterCouponFile
def __init__(self, *args, **kwargs):
super(MasterCouponFileForm, self).__init__(*args, **kwargs)
self.fields['range'].widget = DisablePopulatedText(self.instance)
self.fields['quantity'].widget = DisablePopulatedText(self.instance)
在widgets.py中
from django import forms
class DisablePopulatedText(forms.TextInput):
def render(self, name, value, attrs=None, renderer=None):
"""Render the widget as an HTML string."""
if value is not None:
# Just return the value, as normal read_only fields do
# Add Hidden Input otherwise the old fields are still required
HiddenInput = forms.HiddenInput()
return format_html("{}\n"+HiddenInput.render(name, value), self.format_value(value))
else:
return super().render(name, value, attrs, renderer)
...
from django import forms
from django.forms.util import flatatt
from django.utils.encoding import force_text
class DisablePopulatedText(forms.TextInput):
def __init__(self, obj, attrs=None):
self.object = obj
super(DisablePopulatedText, self).__init__(attrs)
def render(self, name, value, attrs=None):
if value is None:
value = ''
final_attrs = self.build_attrs(attrs, type=self.input_type, name=name)
if value != '':
# Only add the 'value' attribute if a value is non-empty.
final_attrs['value'] = force_text(self._format_value(value))
if "__prefix__" not in name and not value:
return format_html('<input{0} disabled />', flatatt(final_attrs))
else:
return format_html('<input{0} />', flatatt(final_attrs))
。。。
来自django导入表单
从django.forms.util导入flatatt
从django.utils.encoding导入强制_文本
类DisablePopulatedText(forms.TextInput):
定义初始化(self、obj、attrs=None):
self.object=obj
super(禁用填充文本,self)。\uuuu init\uuuu(属性)
def render(自身、名称、值、属性=无):
如果值为“无”:
值=“”
final\u attrs=self.build\u attrs(attrs,type=self.input\u type,name=name)
如果值!='':
#仅当值为非空时才添加“value”属性。
最终属性['value']=强制文本(自身格式\u值(值))
如果“\u_前缀\u_”不在名称和值中:
返回格式为html(“”,flatatt(最终属性))
其他:
返回格式为html(“”,flatatt(最终属性))
正如其他人所添加的,这是django中的一个设计缺陷,如中所示(感谢Danny W)get\u readonly\u fields
返回父对象,这不是我们想要的
由于我们不能将其设置为只读,因此我的解决方案是使用formset和clean方法验证它不能由表单设置:
class ItemInline(admin.TabularInline):
model = Item
formset = ItemInlineFormset
class ItemInlineFormset(forms.models.BaseInlineFormSet):
def clean(self):
super(ItemInlineFormset, self).clean()
for form in self.forms:
if form.instance.some_condition:
form.add_error('some_condition', 'Nope')
“不正确渲染”的确切含义是什么?新对象行没有任何表单字段,现有对象重复使用“名称”列。存在相同的问题。。似乎传递的对象是主对象的对象,而不是内联对象。这不是问题所在。他遇到的问题是obj保存的是父对象,而不是内联对象。最终,他无法使现有行中的字段为只读,但允许在插入时对字段进行编辑。我仍然认为这是一个丑陋的黑客行为,因为用户可以在子行的更改表单中更改父项,但再次,管理员站点被假装为“受信任”用户使用这个答案对我帮助很大,而且可能是完成这个任务的最好方法。