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在Django的JSONField中放入ImageField

django-jsonfield django-views django-models django

darwhite · 技术社区 · 3 年前

我在django模型中有一个jsonfield,它应该在ImageField旁边保存一些其他字段。

如何将图像的数据存储在该JSONField中,并将图像放在媒体目录中,当我想像常规图像字段一样在模板中使用它时,如何调用它。

请注意,图像已经保存在媒体文件夹中,但我有要放在jsonfield中的文件名

0 回复 | 直到 3 年前

Godda 3 年前

既然你还没有提供任何代码,我将尝试制作一些东西,然后你可以重构代码以满足你的需求!

Class SomeModel(models.ModelForm):
    results = JSONField()

class DynamicJsonForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # ... Add dynamic fields to the form
        self.extra = []  # Save the reference for the fields

    class Meta:
        model = SomeModel
        exclude = ("results",)

    def save(self, commit=True):
        results = {}
        for extra in self.extra:
            value = self.cleaned_data.get(extra)
            question = some_query.question
            if "photo" in extra and value:  # value = photo
                filename, ext = value.name.split(".")
                filename = "media/the/path/to/photos/{}_{}.{}".format(filename, uuid4().hex, ext)
                uploaded_file = SimpleUploadedFile(filename, value.read(), value.content_type)
                image = Image.open(uploaded_file)
                if image.mode in ("RGBA", "P"):
                    image = image.convert("RGB")
                image.save(fp=filename)
                results[question][extra] = filename
            else:
                results[question][extra] = value
        self.instance.results = results
        return super().save(commit)

另一种选择是创建fields.py并尝试此解决方案:

import os

from django import forms
from django.conf import settings
from django.core.files.storage import FileSystemStorage

class FormFileSystemStorageImageField(forms.ImageField, FileSystemStorage):
    def __init__(self, location=None, *args, **kwargs):
        super().__init__(*args, **kwargs)  # Call ImageField __init__, I wonder how to call second parent's __init__
        self._orig_location = location
        self._location = os.path.join(settings.MEDIA_ROOT, location)

    def storage_path(self, name):
        return os.path.join(self._orig_location, name)

forms.py来处理字段,这不是完美的解决方案,而是给你一个如何进行的想法。

from .fields import FormFileSystemStorageImageField


    # ... Same as question code
    def save(self, commit=True):
        results = {}
        for extra in self.extra:
            value = self.cleaned_data.get(extra)
            question = some_query.question
            if "photo" in extra and value:  # value = photo
                image_field = self.fields.get(extra)
                image_field.save(value.name, value)
                results[question][extra] = image_field.storage_path(value.name)
            else:
                results[question][extra] = value
        self.instance.results = results
        return super().save(commit)