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我正在上传图像，图像上传并将其保存在 django 模型中工作得很好。创建缩略图并将其保存到 temp。位置也可以。不起作用的部分是保存缩略图，文件已创建并保存，但它是一个空文件。:/ 如何解决丢失数据的问题。

如果有人知道如何将 pil 图像转换为 django 模型 - imagefield 而不进行 tmp 保存......请告诉。

def ajax_upload(request):
    if request.method == 'POST':
        newfile = Image()
        newfile.user = request.user
        file_content = ContentFile(request.raw_post_data)
        file_name = request.GET.get('file')

        newfile.image.save(file_name, file_content)

        # thumbnail creation ==========================================
        path = os.path.join(settings.MEDIA_ROOT, newfile.image.url)
        thumb_image = pil_image.open(path)

        # ImageOps compatible mode
        if thumb_image.mode not in ("L", "RGB"):
            thumb_image = thumb_image.convert("RGB")

        thumb_image_fit = ImageOps.fit(thumb_image, (32, 32), pil_image.ANTIALIAS)

        #saving temp file
        tmp_file_path = os.path.join(settings.MEDIA_ROOT, 'tmp_thumbnail.jpg')
        thumb_image_fit.save(tmp_file_path, 'JPEG', quality=75)

        #opening the tmp file and save it to django model
        thumb_file_data = open(tmp_file_path)
        thumb_file = File(thumb_file_data)

        newfile.thumbnail.save(file_name, thumb_file)
        #===============================================================

        results = {'url': newfile.image.url, 'id': newfile.id, 'width': newfile.image.width, 'height': newfile.image.height}
        return HttpResponse(json.dumps(results))
    raise Http404
4

2 回答 2

1

您可以保存文件并将其路径（相对于 MEDIA_ROOT）手动分配给目标字段。

thumb_path = 'uploads/1_small.jpg'
thumb_image_fit.save(os.path.join(MEDIA_ROOT, thumb_path), 'JPEG', quality=75)
newfile.thumbnail = thumb_path

当然，您需要手动完成所有 Django 的工作——检查文件是否存在，如果存在则修改名称，等等。

于 2012-04-18T03:47:20.023 回答
1 
from django.core.files.base import ContentFile
from PIL import ImageOps, Image as pil_image
import os.path
import json


def ajax_upload(request):
    if request.method == 'POST':
        newfile = Image()
        newfile.user = request.user
        file_content = ContentFile(request.raw_post_data)
        file_name = request.GET.get('file')

        newfile.image.save(file_name, file_content)
        newfile.thumbnail.save(file_name, file_content)

        #opening and resizing the thumbnail
        path = os.path.join(settings.MEDIA_ROOT, newfile.thumbnail.url)
        thumb_file = pil_image.open(path)

        if thumb_file.mode not in ("L", "RGB"):
            thumb_file = thumb_file.convert("RGB")

        thumb_image_fit = ImageOps.fit(thumb_file, (100, 100), pil_image.ANTIALIAS)
        thumb_image_fit.save(path)

        #===============================================================

        results = {
                    'image':
                        {
                            'url': newfile.image.path,
                            'width': newfile.image.width,
                            'height': newfile.image.height
                        },
                    'thumbnal':
                         {
                            'url': newfile.thumbnail.path,
                            'width': newfile.thumbnail.width,
                            'height': newfile.thumbnail.height
                         }
                    }
        return HttpResponse(json.dumps(results))
    raise Http404
于 2012-04-18T15:12:55.017 回答