python - 从 Django shell 中将照片上传到 Photologue 的自定义命令？

Question

我已成功使用 Photologue 来展示 galleries of regularly-created data plot images .当然，既然已经建立了能力，就会创建大量的数据图，并且需要共享它们!

下一步是使用 Django shell 中的 manage.py 编写上传图像并将它们添加到图库的过程脚本；然而，作为 Django 的业余爱好者，我遇到了一些困难。

这是我目前开发的自定义命令addphoto.py:

from django.core.management.base import BaseCommand, CommandError
from django.utils import timezone
from photologue.models import Photo, Gallery

import os
from datetime import datetime
import pytz

class Command(BaseCommand):

    help = 'Adds a photo to Photologue.'

    def add_arguments(self, parser):
        parser.add_argument('imagefile', type=str)
        parser.add_argument('--title', type=str)
        parser.add_argument('--date_added', type=str, help="datetime string in 'YYYY-mm-dd HH:MM:SS' format [UTC]")
        parser.add_argument('--gallery', type=str)

    def handle(self, *args, **options):

        imagefile = options['imagefile']

        if options['title']:
            title = options['title']
        else:
            base = os.path.basename(imagefile)
            title = os.path.splitext(base)[0]
        if options['date_added']:
            date_added = datetime.strptime(options['date_added'],'%Y-%m-%d %H:%M:%S').replace(tzinfo=pytz.UTC)
        else:
            date_added = timezone.now()

        p = Photo(image=imagefile, title=title, date_added=date_added)
        p.save()

不幸的是，当使用 --traceback 执行时，会产生以下结果:

./manage.py addphoto '../dataplots/monitoring/test.png' --traceback
Failed to read EXIF DateTimeOriginal
Traceback (most recent call last):
  File "/home/user/mysite/photologue/models.py", line 494, in save
    exif_date = self.EXIF(self.image.file).get('EXIF DateTimeOriginal', None)
  File "/home/user/mysite/venv/lib/python3.5/site-packages/django/db/models/fields/files.py", line 51, in _get_file
    self._file = self.storage.open(self.name, 'rb')
  File "/home/user/mysite/venv/lib/python3.5/site-packages/django/core/files/storage.py", line 38, in open
    return self._open(name, mode)
  File "/home/user/mysite/venv/lib/python3.5/site-packages/django/core/files/storage.py", line 300, in _open
    return File(open(self.path(name), mode))
  File "/home/user/mysite/venv/lib/python3.5/site-packages/django/core/files/storage.py", line 405, in path
    return safe_join(self.location, name)
  File "/home/user/mysite/venv/lib/python3.5/site-packages/django/utils/_os.py", line 78, in safe_join
    'component ({})'.format(final_path, base_path))
django.core.exceptions.SuspiciousFileOperation: The joined path (/home/user/mysite/dataplots/monitoring/test.png) is located outside of the base path component (/home/user/mysite/media)
Traceback (most recent call last):
  File "./manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "/home/user/mysite/venv/lib/python3.5/site-packages/django/core/management/__init__.py", line 363, in execute_from_command_line
    utility.execute()
  File "/home/user/mysite/venv/lib/python3.5/site-packages/django/core/management/__init__.py", line 355, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/user/mysite/venv/lib/python3.5/site-packages/django/core/management/base.py", line 283, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/user/mysite/venv/lib/python3.5/site-packages/django/core/management/base.py", line 330, in execute
    output = self.handle(*args, **options)
  File "/home/user/mysite/photologue/management/commands/addphoto.py", line 36, in handle
    p.save()
  File "/home/user/mysite/photologue/models.py", line 553, in save
    super(Photo, self).save(*args, **kwargs)
  File "/home/user/mysite/photologue/models.py", line 504, in save
    self.pre_cache()
  File "/home/user/mysite/photologue/models.py", line 472, in pre_cache
    self.create_size(photosize)
  File "/home/user/mysite/photologue/models.py", line 411, in create_size
    if self.size_exists(photosize):
  File "/home/user/mysite/photologue/models.py", line 364, in size_exists
    if self.image.storage.exists(func()):
  File "/home/user/mysite/venv/lib/python3.5/site-packages/django/core/files/storage.py", line 392, in exists
    return os.path.exists(self.path(name))
  File "/home/user/mysite/venv/lib/python3.5/site-packages/django/core/files/storage.py", line 405, in path
    return safe_join(self.location, name)
  File "/home/user/mysite/venv/lib/python3.5/site-packages/django/utils/_os.py", line 78, in safe_join
    'component ({})'.format(final_path, base_path))
django.core.exceptions.SuspiciousFileOperation: The joined path (/home/user/mysite/dataplots/monitoring/cache/test_thumbnail.png) is located outside of the base path component (/home/user/mysite/media)

显然，图像文件的副本没有放在 media/ 目录中。此外，当 image、title 和 date_added 列填充到网站数据库的 photologue_photos 表中时， slug 列不是。

如何将文件上传到MEDIA_ROOT目录？

---

以下是 Photologue models.py 文件中的 Photo 和 ImageModel 模型的相关片段，供引用:

class Photo(ImageModel):
    title = models.CharField(_('title'),
                         max_length=250,
                         unique=True)
    slug = models.SlugField(_('slug'),
                        unique=True,
                        max_length=250,
                        help_text=_('A "slug" is a unique URL-friendly title for an object.'))
    caption = models.TextField(_('caption'),
                               blank=True)
    date_added = models.DateTimeField(_('date added'),
                                      default=now)
    is_public = models.BooleanField(_('is public'),
                                    default=True,
                                    help_text=_('Public photographs will be displayed in the default views.'))
    sites = models.ManyToManyField(Site, verbose_name=_(u'sites'),
                                   blank=True)

    objects = PhotoQuerySet.as_manager()

    def save(self, *args, **kwargs):
        if self.slug is None:
            self.slug = slugify(self.title)
        super(Photo, self).save(*args, **kwargs)


class ImageModel(models.Model):
    image = models.ImageField(_('image'),
                          max_length=IMAGE_FIELD_MAX_LENGTH,
                          upload_to=get_storage_path)
    date_taken = models.DateTimeField(_('date taken'),
                                  null=True,
                                  blank=True,
                                  help_text=_('Date image was taken; is obtained from the image EXIF data.'))
    view_count = models.PositiveIntegerField(_('view count'),
                                         default=0,
                                         editable=False)
    crop_from = models.CharField(_('crop from'),
                             blank=True,
                             max_length=10,
                             default='center',
                             choices=CROP_ANCHOR_CHOICES)
    effect = models.ForeignKey('photologue.PhotoEffect',
                           null=True,
                           blank=True,
                           related_name="%(class)s_related",
                           verbose_name=_('effect'))

    class Meta:
        abstract = True

    def __init__(self, *args, **kwargs):
        super(ImageModel, self).__init__(*args, **kwargs)
        self._old_image = self.image

    def save(self, *args, **kwargs):
        image_has_changed = False
        if self._get_pk_val() and (self._old_image != self.image):
            image_has_changed = True
            # If we have changed the image, we need to clear from the cache all instances of the old
            # image; clear_cache() works on the current (new) image, and in turn calls several other methods.
            # Changing them all to act on the old image was a lot of changes, so instead we temporarily swap old
            # and new images.
            new_image = self.image
            self.image = self._old_image
            self.clear_cache()
            self.image = new_image  # Back to the new image.
            self._old_image.storage.delete(self._old_image.name)  # Delete (old) base image.
        if self.date_taken is None or image_has_changed:
            # Attempt to get the date the photo was taken from the EXIF data.
            try:
                exif_date = self.EXIF(self.image.file).get('EXIF DateTimeOriginal', None)
                if exif_date is not None:
                    d, t = exif_date.values.split()
                    year, month, day = d.split(':')
                    hour, minute, second = t.split(':')
                    self.date_taken = datetime(int(year), int(month), int(day),
                                           int(hour), int(minute), int(second))
            except:
                logger.error('Failed to read EXIF DateTimeOriginal', exc_info=True)
        super(ImageModel, self).save(*args, **kwargs)
        self.pre_cache()

---

这是请求的 get_storage_path 函数:

# Look for user function to define file paths
PHOTOLOGUE_PATH = getattr(settings, 'PHOTOLOGUE_PATH', None)
if PHOTOLOGUE_PATH is not None:
    if callable(PHOTOLOGUE_PATH):
        get_storage_path = PHOTOLOGUE_PATH
    else:
        parts = PHOTOLOGUE_PATH.split('.')
        module_name = '.'.join(parts[:-1])
        module = import_module(module_name)
        get_storage_path = getattr(module, parts[-1])
else:
    def get_storage_path(instance, filename):
        fn = unicodedata.normalize('NFKD', force_text(filename)).encode('ascii', 'ignore').decode('ascii')
        return os.path.join(PHOTOLOGUE_DIR, 'photos', fn)

Answer 1

关于您问题的一部分:slug 列在保存 Photo 时为空。

它应该在保存照片时自动填充-作为上面Photologue源代码的复制和粘贴if self.slug is None : self.slug = slugify(self.title) 清楚了。

这表明 Photologue 源代码实际上不是从您的管理命令中调用 - 您可以通过向 Photologue 代码的本地副本添加一些快速调试代码来检查这一点，例如save() 方法中的 print() 语句，并检查它是否正在运行。