장고.

장고. 모델에 대한 저장 무시

---

모델을 저장하기 전에 사진 크기를 조정하고 있습니다. 그러나 새 사진이 추가되었거나 설명이 업데이트되었는지 어떻게 확인할 수 있습니까? 모델이 저장 될 때마다 크기 조정을 건너 뛸 수 있습니까?

class Model(model.Model):
    image=models.ImageField(upload_to='folder')
    thumb=models.ImageField(upload_to='folder')
    description=models.CharField()


    def save(self, *args, **kwargs):
        if self.image:
            small=rescale_image(self.image,width=100,height=100)
            self.image_small=SimpleUploadedFile(name,small_pic)
        super(Model, self).save(*args, **kwargs)

새 이미지가로드되거나 이미지가 업데이트 된 경우에만 크기를 조정하고 설명을 업데이트하지는 않습니다.

---

몇 가지 생각 :

class Model(model.Model):
    _image=models.ImageField(upload_to='folder')
    thumb=models.ImageField(upload_to='folder')
    description=models.CharField()

    def set_image(self, val):
        self._image = val
        self._image_changed = True

        # Or put whole logic in here
        small = rescale_image(self.image,width=100,height=100)
        self.image_small=SimpleUploadedFile(name,small_pic)

    def get_image(self):
        return self._image

    image = property(get_image, set_image)

    # this is not needed if small_image is created at set_image
    def save(self, *args, **kwargs):
        if getattr(self, '_image_changed', True):
            small=rescale_image(self.image,width=100,height=100)
            self.image_small=SimpleUploadedFile(name,small_pic)
        super(Model, self).save(*args, **kwargs)

모든 의사 자동 장고 도구 (예 : ModelForm, contrib.admin 등)에서 잘 작동하는지 확실하지 않습니다.

---

모델의 pk 필드를 확인하십시오. None이면 새 개체입니다.

class Model(model.Model):
    image=models.ImageField(upload_to='folder')
    thumb=models.ImageField(upload_to='folder')
    description=models.CharField()


    def save(self, *args, **kwargs):
        if 'form' in kwargs:
            form=kwargs['form']
        else:
            form=None

        if self.pk is None and form is not None and 'image' in form.changed_data:
            small=rescale_image(self.image,width=100,height=100)
            self.image_small=SimpleUploadedFile(name,small_pic)
        super(Model, self).save(*args, **kwargs)

편집 : form.changed_data에 'image'에 대한 검사를 추가했습니다. 이것은 관리자 사이트를 사용하여 이미지를 업데이트한다고 가정합니다. 또한 아래 표시된대로 기본 save_model 메소드를 대체해야합니다.

class ModelAdmin(admin.ModelAdmin):
    def save_model(self, request, obj, form, change):
        obj.save(form=form)

---

새 이미지가 게시되었음을 확인하기 위해 추가 인수를 제공 할 수 있습니다.
다음과 같은 것 :

def save(self, new_image=False, *args, **kwargs):
    if new_image:
        small=rescale_image(self.image,width=100,height=100)
        self.image_small=SimpleUploadedFile(name,small_pic)
    super(Model, self).save(*args, **kwargs)

또는 요청 변수를 전달

def save(self, request=False, *args, **kwargs):
    if request and request.FILES.get('image',False):
        small=rescale_image(self.image,width=100,height=100)
        self.image_small=SimpleUploadedFile(name,small_pic)
    super(Model, self).save(*args, **kwargs)

I think these wont break your save when called simply.

You may put this in your admin.py so that this work with admin site too (for second of above solutions):

class ModelAdmin(admin.ModelAdmin):

    ....
    def save_model(self, request, obj, form, change): 
        instance = form.save(commit=False)
        instance.save(request=request)
        return instance

---

What I did to achieve the goal was to make this..

# I added an extra_command argument that defaults to blank
def save(self, extra_command="", *args, **kwargs):

and below the save() method is this..

# override the save method to create an image thumbnail
if self.image and extra_command != "skip creating photo thumbnail":
    # your logic here

so when i edit some fields but not editing the image, I put this..

Model.save("skip creating photo thumbnail")

you can replace the "skip creating photo thumbnail" with "im just editing the description" or a more formal text.

Hope this one helps!

---

Query the database for an existing record with the same PK. Compare the file sizes and checksums of the new and existing images to see if they're the same.

---

In new version it is like this:

def validate(self, attrs):
    has_unknown_fields = set(self.initial_data) - set(self.fields.keys())
    if has_unknown_fields:
        raise serializers.ValidationError("Do not send extra fields")
    return attrs

---

I have found one another simple way to store the data into the database

models.py

class LinkModel(models.Model):
    link = models.CharField(max_length=500)
    shortLink = models.CharField(max_length=30,unique=True)

In database I have only 2 variables

views.py

class HomeView(TemplateView):
    def post(self,request, *args, **kwargs):
        form = LinkForm(request.POST)

        if form.is_valid():
            text = form.cleaned_data['link'] # text for link

        dbobj = LinkModel()
        dbobj.link = text
        self.no = self.gen.generateShortLink() # no for shortLink
        dbobj.shortLink = str(self.no)
        dbobj.save()         # Saving from views.py

In this I have created the instance of model in views.py only and putting/saving data into 2 variables from views only.

참고URL : https://stackoverflow.com/questions/4269605/django-override-save-for-model