Django中具有ImageField的动态JsonForm fields.py forms.py

问题描述

我正在Django中创建一个动态表单（使用JSON格式），该表单需要使用Django Storage保存多个图像，并将对该文件的引用保存在JSON字段中。

这是我现在拥有的东西，它可以工作，但是确实很丑陋，Django已经做到了，我不知道如何重用相同的功能。

Stream valueStream = (Stream)value;

这实际上有效，它将数据保存到JSONField（结果），并将图像保存到本地文件系统存储。

如何改进使用Django Storage并使它变得简单？使用Django 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) 似乎容易得多，但是我不能使用普通的Model.save()，因为它需要动态

解决方法

我将FileSystemStorage与forms.ImageField混合在一起，虽然不是一个完美的解决方案，但是看起来更好。

fields.py

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

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)