ReadOnlyField On Admin Fixed for 1.3

admin.py

from django.contrib import admin
import datetime
from django import forms

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

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 

        return form

# Model
# field = ForeignKey(OtherMother)
# field2 = ManyToMany(OtherMother)

class ModelAdmin(ReadOnlyAdminFields, admin.ModelAdmin):
    def get_form(self, request, obj=None, **kwargs):
        ReadOnlyAdminFields.readonly = ('field','field2')
        return super(ModelAdmin, self).get_form(request, obj, **kwargs)


admin.site.register(Model,ModeloAdmin)