如果您需要多个只读字段。您可以使用下面给出的任何方法

方法1

class ItemForm(ModelForm):
    readonly = ('sku',)

    def __init__(self, *arg, **kwrg):
        super(ItemForm, self).__init__(*arg, **kwrg)
        for x in self.readonly:
            self.fields[x].widget.attrs['disabled'] = 'disabled'

    def clean(self):
        data = super(ItemForm, self).clean()
        for x in self.readonly:
            data[x] = getattr(self.instance, x)
        return data

方法2

继承的方法

class AdvancedModelForm(ModelForm):


    def __init__(self, *arg, **kwrg):
        super(AdvancedModelForm, self).__init__(*arg, **kwrg)
        if hasattr(self, 'readonly'):
            for x in self.readonly:
                self.fields[x].widget.attrs['disabled'] = 'disabled'

    def clean(self):
        data = super(AdvancedModelForm, self).clean()
        if hasattr(self, 'readonly'):
            for x in self.readonly:
                data[x] = getattr(self.instance, x)
        return data


class ItemForm(AdvancedModelForm):
    readonly = ('sku',)

Django 1.9添加了Field。禁用属性:https://docs.djangoproject.com/en/stable/ref/forms/fields/#disabled

当disabled布尔参数设置为True时，使用disabled HTML属性禁用表单字段，以便用户不能编辑它。即使用户篡改了提交给服务器的字段值，它也会被忽略，而由表单初始数据的值代替。

一个简单的选择是在模板中输入form.instance.fieldName而不是form.fieldName。

我也遇到了同样的问题，所以我创建了一个Mixin，它似乎适用于我的用例。

class ReadOnlyFieldsMixin(object):
    readonly_fields =()

    def __init__(self, *args, **kwargs):
        super(ReadOnlyFieldsMixin, self).__init__(*args, **kwargs)
        for field in (field for name, field in self.fields.iteritems() if name in self.readonly_fields):
            field.widget.attrs['disabled'] = 'true'
            field.required = False

    def clean(self):
        cleaned_data = super(ReadOnlyFieldsMixin,self).clean()
        for field in self.readonly_fields:
           cleaned_data[field] = getattr(self.instance, field)

        return cleaned_data

用法，只需定义哪些必须是只读的:

class MyFormWithReadOnlyFields(ReadOnlyFieldsMixin, MyForm):
    readonly_fields = ('field1', 'field2', 'fieldx')

在小部件上设置readonly只会使浏览器中的输入变为只读。添加一个返回实例的clean_sku。Sku确保字段值不会在表单级别上改变。

def clean_sku(self):
    if self.instance: 
        return self.instance.sku
    else: 
        return self.fields['sku']

这样您就可以使用model的(未修改的保存)并避免获得字段所需的错误。

你可以这样做:

检查请求是否更新或保存一个新对象。 如果请求更新，则禁用字段sku。 如果请求是添加一个新对象，那么您必须在不禁用字段sku的情况下呈现表单。

这里有一个如何这样做的例子。

class Item(models.Model):
    sku = models.CharField(max_length=50)
    description = models.CharField(max_length=200)
    added_by = models.ForeignKey(User)


class ItemForm(ModelForm):
    def disable_sku_field(self):
        elf.fields['sku'].widget.attrs['readonly'] = True

    class Meta:
        model = Item
        exclude = ('added_by')

def new_item_view(request):
    if request.method == 'POST':
        form = ItemForm(request.POST)
        # Just create an object or instance of the form.
        # Validate and save
    else:
            form = ItemForm()
    # Render the view

def update_item_view(request):
    if request.method == 'POST':
        form = ItemForm(request.POST)
        # Just create an object or instance of the form.
        # Validate and save
    else:
        form = ItemForm()
        form.disable_sku_field() # call the method that will disable field.

    # Render the view with the form that will have the `sku` field disabled on it.