如果值为无，则 Django 管理员更改视图排除字段

Question

目前我需要从更改视图中删除一些字段，如果它的值为无

所以我有一个取款模型的管理员，如下所示：

class WithdrawalsAdminForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):

        super(WithdrawalsAdminForm, self).__init__(*args, **kwargs)

        none_fields = []

        for single_field in self.fields:

            self.fields[single_field].disabled = True

            if self.initial[single_field] == None:

                none_fields.append(single_field)

        if none_fields:

            for single_none_field in none_fields:

                self.fields.pop(single_none_field)

class WithdrawalsAdmin(admin.ModelAdmin):

    list_display = ('get_email', 'get_phone_number', 'currency', 'method', 'amount', 'status', 'created')

    list_display_links = ('get_email', 'get_phone_number', 'currency', 'method', 'amount', 'status', 'created')

    list_filter = [WithdrawalsStatusFilter] #just a custom list filter

    change_form_template = 'admin/backend/withdrawals_change_form.html'

    form = WithdrawalsAdminForm

    fields = (

        'id',

        'get_email',

        'get_phone_number',

        'get_full_name',

        'currency', 

        'method',

        'to_bank',

        'to_address',

        'to_card', 

        'amount', 

        'status', 

        'transaction_id',

        'created', 

        'submitted',

        'confirmed',

        )

    readonly_fields = (

        'id',

        'get_email',

        'get_phone_number',

        'get_full_name',

        'created', 

    )

    def has_add_permission(self, request, obj=None):

        return False

    def get_queryset(self, request):

        qs = super(WithdrawalsAdmin, self).get_queryset(request)

        return qs.filter(Q(method=1) | Q(method=4))

但它返回给我以下错误：

“在‘WithdrawalsForm’中找不到键‘to_address’。选项有：金额、货币、方法、状态、to_bank。”

金额、货币、方法、状态、to_bank 在对象中的值都不是 None

to_address 值是 None，我还尝试打印出任何没有的字段，if self.initial[single_field] == None:并得到正确的字段名称（其中包括 to_address）具有 None 值。

如何从更改视图中排除具有 None 值的字段？

Answer 1

您可能需要重写 get_fields 和 get_readonly_fields 方法：def _get_non_field_names(self, obj, candidate_fields):    for field in candidate_fields:        if hasattr(obj, field) and getattr(obj, field):            yield field        elif getattr(self, field)(obj):            yield fielddef get_fields(self, request, obj=None):    form = self._get_form_for_get_fields(request, obj)    candidate_fields = self.fields if self.fields else list(form.base_fields)    fields = self._get_non_field_names(obj, candidate_fields)    readonly_fields = list(self.get_readonly_fields(request, obj))    return list(fields) + readonly_fieldsdef get_readonly_fields(self, request, obj=None):    candidate_readonly_fields = self.readonly_fields    readonly_fields = list(self._get_non_field_names(obj, candidate_readonly_fields))    return readonly_fields

Answer 2

困难的部分仍然是在自定义字段上检查 None 值。目前我只使用以下 get_fields 来检查，逻辑性不大，但仍然可以从表单中删除字段：def get_fields(self, request, obj=None):    fields = super(WithdrawalsAdmin, self).get_fields(request, obj)    fields_list = list(fields)    if obj:        if obj.to_address is None:            fields_list.remove('to_address')        .... #and other fields    fields_tuple = tuple(fields_list)    return fields_tuple