Django:生成CSV文件并将其存储到FileField中 [英] Django: generate a CSV file and store it into FileField

问题描述

在Django View文件中，我需要从元组列表中生成CSV文件，并将该CSV文件存储到模型的FileField中.

In my Django View file, I need to generate a CSV file from a list of tuples and store the CSV file into the FileField of my model.

class Bill(models.Model):
    billId = models.IntegerField()
    bill = models.FileField(upload_to='bills')

我在此网站上进行了搜索，发现了一些帖子，例如

I searched on this site, and found some posts such as Django - how to create a file and save it to a model's FileField?, but the solutions can help me.

我需要将CSV文件存储在"media/bills/"文件夹中，希望该CSV文件可以与Bill对象一起在数据库中删除.

I need the CSV file to be stored in 'media/bills/' fold, and I hope the CSV file can be deleted together with the Bill object in the database.

我尝试了以下代码，但它不能满足我的要求.对于每个文件，它将生成两个文件"output.csv"和"output_xxesss.csv".在这两个文件上，无法通过调用"Bill.objects.all().delete()"来删除.

I tried the following codes, but it cannot meet my requirements. For each file, it will generate two files 'output.csv' and 'output_xxesss.csv'. At the two files cannot be deleted by calling 'Bill.objects.all().delete()'.

path = join(settings.MEDIA_ROOT, 'bills', 'output.csv')
print path
f = open(path, 'w+b')
f.truncate()
csvWriter = csv.writer(f)
csvWriter.writerow(('A', 'B', 'C'))
for r in rs:
    print r
    csvWriter.writerow(convert(r))

bill = Bill()
bill.billId = 14
bill.bill.save('output.csv', File(f))
bill.save()

谢谢

我尝试了以下代码，但无法通过调用'Bill.objects.all().delete()'删除文件.

I tried the following codes, but it can not delete the file by calling 'Bill.objects.all().delete()'.

bill = Bill()
bill.billId = 14
bill.bill.name = 'bills/output.csv'
bill.save()

推荐答案

删除实例不会删除关联的文件.您可以考虑使用signals精确地表示pre_delete.您可以编写一个接收器，在其中可以删除关联的文件.

Deleting an instance would not delete the associated file. You may consider using signals to be precise pre_delete. You can write a receiver where in you can delete the associated file.

from django.dispatch import receiver
from django.db.models.signals import pre_delete 

@receiver(pre_delete)
def func_name(sender, instance, **kwargs):
    your logic

您可以在此处找到文档..

You can find documentation here.

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