问Django外键只读

EN

from django import forms
from django.utils.safestring import mark_safe
from datetime import datetime

class ReadOnlyWidget(forms.Widget):
    def __init__(self, original_value, display_value):
        self.original_value = original_value
        self.display_value = display_value
        super(ReadOnlyWidget, self).__init__()

    def render(self, name, value, attrs=None):
        if self.display_value is not None:
            return unicode(self.display_value)
        return unicode(self.original_value)

    def value_from_datadict(self, data, files, name):
        return self.original_value

#to make fields  foreignkey readonly

class ReadOnlyAdminFields(object):
    def get_form(self, request, obj=None):
        form = super(ReadOnlyAdminFields, self).get_form(request, obj)
        if hasattr(self, 'readonly') and obj is not None:
            for field_name in self.readonly:
                if field_name in form.base_fields:
                    if hasattr(obj, 'get_%s_display' % field_name):
                        display_value = getattr(obj, 'get_%s_display' % field_name)()
                    else:
                        display_value = None
                    if getattr(obj, field_name).__class__ in [unicode , long, int, float, datetime, list]:
                        form.base_fields[field_name].widget = ReadOnlyWidget(getattr(obj, field_name), display_value)
                    else:
                        form.base_fields[field_name].widget = ReadOnlyWidget(getattr(obj, field_name).id, display_value)
            form.base_fields[field_name].required = False
        return form