我有一个模型
Attachment，在Django 1.4.1 应用程序中使用了FileField。这个FileField包含一个可调用的upload_to参数，根据 Django 文档 的说明，应该在表单(因此是模型)保存时调用。当我运行下面的FormTest时，upload_to不会被调用，因此文件没有出现在upload_to方法提供的位置。 我错在哪里了？
请注意，在ModelTest中通过的测试中，upload_to方法按预期工作。
我查看过的一些看起来不是问题的事项：
Attachment模型中属性的顺序。 我找到了一些问题，似乎表明这个顺序很重要。由于我的upload_to方法使用directory属性，所以我认为这可能会导致问题。 但它不会使方法没有被调用。- 也许
is_valid()没有被调用。 不，我已经确认它被调用了。 - ...
测试代码：
from core.forms.attachments import AttachmentForm
from django.test import TestCase
import unittest
from django.core.files.uploadedfile import SimpleUploadedFile
from django.core.files.storage import default_storage
def suite():
return unittest.TestSuite(
[
unittest.TestLoader().loadTestsFromTestCase(FormTest),
]
)
class FormTest(TestCase):
def test_form_1(self):
filename = 'filename'
f = file(filename)
data = {'name':'name',}
file_data = {'attachment_file':SimpleUploadedFile(f.name,f.read()),}
form = AttachmentForm(data=data,files=file_data)
self.assertTrue(form.is_valid())
attachment = form.save()
root_directory = 'attachments'
upload_location = root_directory + '/' + attachment.directory + '/' + filename
self.assertTrue(attachment.attachment_file) # Fails
self.assertTrue(default_storage.exists(upload_location)) # Fails
附件模型：
from django.db import models
from parent_mixins import Parent_Mixin
import uuid
from django.db.models.signals import pre_delete,pre_save
from dirtyfields import DirtyFieldsMixin
def upload_to(instance,filename):
return 'attachments/' + instance.directory + '/' + filename
def uuid_directory_name():
return uuid.uuid4().hex
class Attachment(DirtyFieldsMixin,Parent_Mixin,models.Model):
attachment_file = models.FileField(blank=True,null=True,upload_to=upload_to)
directory = models.CharField(blank=False,default=uuid_directory_name,null=False,max_length=32)
name = models.CharField(blank=False,default=None,null=False,max_length=128)
class Meta:
app_label = 'core'
def __str__(self):
return unicode(self).encode('utf-8')
def __unicode__(self):
return unicode(self.name)
@models.permalink
def get_absolute_url(self):
return('core_attachments_update',(),{'pk': self.pk})
# def save(self,*args,**kwargs):
# super(Attachment,self).save(*args,**kwargs)
def pre_delete_callback(sender, instance, *args, **kwargs):
if not isinstance(instance, Attachment): return
if not instance.attachment_file: return
instance.attachment_file.delete(save=False)
def pre_save_callback(sender, instance, *args, **kwargs):
if not isinstance(instance, Attachment): return
if not instance.attachment_file: return
if instance.is_dirty():
dirty_fields = instance.get_dirty_fields()
if 'attachment_file' in dirty_fields:
old_attachment_file = dirty_fields['attachment_file']
old_attachment_file.delete()
pre_delete.connect(pre_delete_callback)
pre_save.connect(pre_save_callback)
附件表单：
from ..models.attachments import Attachment
from crispy_forms.helper import FormHelper
from crispy_forms.layout import Div,Layout,HTML,Field,Fieldset,Button,ButtonHolder,Submit
from django import forms
class AttachmentFormHelper(FormHelper):
form_tag=False
layout = Layout(
Div(
Div(
Field('name',css_class='span4'),
Field('attachment_file',css_class='span4'),
css_class='span4',
),
css_class='row',
),
)
class AttachmentForm(forms.ModelForm):
helper = AttachmentFormHelper()
class Meta:
fields=('attachment_file','name')
model = Attachment
class AttachmentInlineFormHelper(FormHelper):
form_tag=False
form_style='inline'
layout = Layout(
Div(
Div(
Field('name',css_class='span4'),
Field('attachment_file',css_class='span4'),
Field('DELETE',css_class='span4'),
css_class='span4',
),
css_class='row',
),
)
class AttachmentInlineForm(forms.ModelForm):
helper = AttachmentInlineFormHelper()
class Meta:
fields=('attachment_file','name')
model = Attachment
更新
我还在这些单元测试中对Attachment模型类进行了测试，所有测试都通过：
from core.models.attachments import Attachment
from core.models.attachments import upload_to
from django.test import TestCase
import unittest
from django.core.files.storage import default_storage
from django.core.files.base import ContentFile
def suite():
return unittest.TestSuite(
[
unittest.TestLoader().loadTestsFromTestCase(ModelTest),
]
)
class ModelTest(TestCase):
def test_model_minimum_fields(self):
attachment = Attachment(name='name')
attachment.attachment_file.save('test.txt',ContentFile("hello world"))
attachment.save()
self.assertEqual(str(attachment),'name')
self.assertEqual(unicode(attachment),'name')
self.assertTrue(attachment.directory)
# def test_model_full_fields(self):
# attachment = Attachment()
# attachement.save()
def test_file_operations_basic(self):
root_directory = 'attachments'
filename = 'test.txt'
attachment = Attachment(name='name')
attachment.attachment_file.save(filename,ContentFile('test'))
attachment.save()
upload_location = root_directory + '/' + attachment.directory + '/' + filename
self.assertEqual(upload_to(attachment,filename),upload_location)
self.assertTrue(default_storage.exists(upload_location))
def test_file_operations_delete(self):
root_directory = 'attachments'
filename = 'test.txt'
attachment = Attachment(name='name')
attachment.attachment_file.save(filename,ContentFile('test'))
attachment.save()
upload_location = upload_to(attachment,filename)
attachment.delete()
self.assertFalse(default_storage.exists(upload_location))
def test_file_operations_change(self):
root_directory = 'attachments'
filename_1 = 'test_1.txt'
attachment = Attachment(name='name')
attachment.attachment_file.save(filename_1,ContentFile('test'))
attachment.save()
upload_location_1 = upload_to(attachment,filename_1)
self.assertTrue(default_storage.exists(upload_location_1))
filename_2 = 'test_2.txt'
attachment.attachment_file.save(filename_2,ContentFile('test'))
attachment.save()
upload_location_2 = upload_to(attachment,filename_2)
self.assertTrue(default_storage.exists(upload_location_2))
self.assertFalse(default_storage.exists(upload_location_1))