Question

我有一个充满城市的Django数据库。我喜欢使用 Django 管理面板将每个城市的多张照片上传到我的服务器上。这可能会被添加到城市管理形式中, 因此图像和信息都可以在一页上编辑。我还需要选择一个主图像并将其转换成缩略图, 以便用于搜索结果。执行这种功能的好方法是什么? 是否有好的 Django adton 来帮助我完成这些任务?

Answer 1

您可以做几个互相关联的模型,并将图像添加为 django-admin 中的 < code> TabularInline ,例如 :

# models.py
class City(models.Model):
    # your fields

class CityImage(models.Model):
    city = models.ForeignKey( City , related_name= images )
    image = models.ImageField(upload_to=image_upload_path)

# admin.py
from django.contrib import admin
from myapp.models import City, CityImage


class CityImageInline(admin.TabularInline):
    model = CityImage


class CityAdmin(admin.ModelAdmin):
    inlines = [CityImageInline]


admin.site.register(City, CityAdmin)

至于缩略图, 您需要在您的 < code> City 模型中选择一个方法来决定您想要作为缩略图使用的相关图像中的哪些图像, 然后做类似的事情 :

import Image
try:
    from cStringIO import StringIO
except ImportError:
    from StringIO import StringIO
from django.core.files.base import ContentFile

# other imports and models

class City(models.Model):
    # your fields

    def get_thumbnail(self, thumb_size=None):
        # find a way to choose one of the uploaded images and
        # assign it to `chosen_image`.
        base = Image.open(StringIO(chosen_image.image.read()))  # get the image

        size = thumb_size
        if not thumb_size:
            # set a default thumbnail size if no `thumb_size` is given
            rate = 0.2  # 20% of the original size
            size = base.size
            size = (int(size[0] * rate), int(size[1] * rate))

        base.thumbnail(size)  # make the thumbnail
        thumbnail = StringIO()
        base.save(thumbnail,  PNG )
        thumbnail = ContentFile(thumbnail.getvalue())  # turn the tumbnail to a "savable" object
        return thumbnail

我希望这能有所帮助!

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