在Django映像上载中使文件名与时间戳唯一

Question

简介：我有一小段代码，可以拍摄任何正在添加的图像，使其变小并保存。为此，我使用了一个名为Filepond的外部库。你知道吗

问题：如果两个用户将相同的名称添加到他们的图像中（不同的图像）。第二个用户图像替换第一个用户图像，两个用户看到相同的图像。你知道吗

我想要的：添加唯一的图像名称。我的尝试低于当前代码。我需要最好的解决方案，这样的名称是不是太大，但独特的

显示代码：

字段.py：

class FilePondField(forms.FileField):
widget = forms.TextInput(attrs={'class': 'fileid'})

def __init__(self, name, *args, **kwargs):
    super(FilePondField, self).__init__(*args, **kwargs)
    self.name = name

def prepare_value(self, data):
    if not data:
        return None

    if isinstance(data, str):
        try:
            tu = TU.objects.get(upload_id=data)
        except TU.DoesNotExist:
            return None
        return tu.upload_id

    name = data.name
    base = os.path.basename(name)
    file_id = "%s_%s" % (self.name, data.instance.pk)
    try:
        tu = TU.objects.get(file_id=file_id)
    except TU.DoesNotExist:
        upload_id = uuid()
        tu = TU(upload_id=upload_id, file_id=file_id,  # uuid(),
                upload_name=base, upload_type=TU.FILE_DATA)
        try:
            with data.storage.open(name, 'rb') as f:
                rd_data = File(f)
                tu.file.save(tu.file_id, rd_data, True)
            tu.save()
        except:
            pass

    return tu.upload_id

def clean(self, data, initial=None):
    self.initial = initial
    if not data:
        if self.required:
            raise ValidationError(self.error_messages['required'], code='required')
        return None
    return data

def save_cb(self, instance, modfld, tu):
    prename = os.path.join(modfld.upload_to, tu.upload_name)
    ffile = ImageFieldFile(instance, modfld, prename)

    try:
        with open(tu.get_file_path(), 'rb') as f:
            data = File(f)
            ffile.save(tu.upload_name, data, False)
    except:
        pass
    return ffile

def do_tmp(self, instance, modfld, value, cb):
    try:
        tu = TU.objects.get(upload_id=value)
        ffile = cb(instance, modfld, tu) if cb else None
    except TU.DoesNotExist:
        ffile = None
    else:
        tu.delete()

    file_id = "%s_%s" % (self.name, instance.pk)
    try:
        ogtu = TU.objects.get(file_id=file_id)
    except TU.DoesNotExist:
        pass
    else:
        ogtu.delete()

    return ffile

def save(self, instance, modfld, value):
    return self.do_tmp(instance, modfld, value, self.save_cb)

def del_tmp(self, instance, modfld, value):
    self.do_tmp(instance, modfld, value, None)

def bound_data(self, data, initial):
    return data

def has_changed(self, initial, data):
    if not initial:
        return data
    return initial != data

表单.py

class ImageForm(forms.ModelForm):
img_fields = []

def __init__(self, *args, **kwargs):
    super(ImageForm, self).__init__(*args, **kwargs)
    for (fld, fargs) in self.img_fields:
        self.fields[fld] = FilePondField(fld, **fargs)

def save(self, *args, **kwargs):
    commit = kwargs.get('commit', True)
    for (fld_nm, fargs) in self.img_fields:
        fld = dict([(f.name, f) for f in self._meta.model._meta.fields])[fld_nm]
        if isinstance(self.fields[fld_nm], FilePondField):
            self.fields[fld_nm] = self.fields[fld_nm].save(self.instance, fld, self.cleaned_data[fld_nm])

    return super(ImageForm, self).save(*args, **kwargs)

def del_tmp (self):
    for (fld_nm, fargs) in self.img_fields:
        fld = dict([(f.name, f) for f in self._meta.model._meta.fields])[fld_nm]
        if isinstance(self.fields[fld_nm], FilePondField):
            self.fields[fld_nm].del_tmp(self.instance, fld, self.cleaned_data[fld_nm])

我的方法：

在字段.py我导入

在函数def prepare_value(self, data):和def do_tmp(self, instance, modfld, value, cb):中，我做了以下更改

...

file_id = "%s_%s_%s" % (self.name, data.instance.pk, datetime.datetime.now().strftime("%Y_%m_%d_%H_%M_%S_%f"))
...

Can someone comment on this or suggest a better alternative

Answer 1

将名称设置为如下所示的变量

name = "Your-General-Name-{}".format((int(time.time())))

然后把它放在你的循环里时间。时间（）值每次都会更改。显然，您不必使用time.time()。您可以使用datetime.datetime.now()等，但是您只需要替换time函数。你知道吗

Answer 2

只需对文件名使用datetime.now()值，如下所示：

from datetime import datetime
open(str(datetime.now()) + ".txt", "w+")

结果：它创建了一个名为2019-04-22 00:21:31.862001.txt