UUID for unique directory name

[Amelie Bacle]

Hello everybody,

I'm developing an app for the first time with Django and I have a problem with upload path and UUID.

I have a form with 3 fields for uploading text files. So I want to save those 3 files in the same directory which have a unique name. First I did this a big random number but if 2 requests are submitted almost at the same time I could generate the same number for those 2 which is not good. So I tried with the UUID method. To do so, I put a extra field in my model for the UUID which I generate in my controller at submission. Now I have a problem, how can I get the value of the UUID field to use it in the upload_to value of the FileField ? 

Here is my Model : 

class Analysis(models.Model):

uuidDir = models.CharField(max_length = 36)

dirFile = 'documents/%Y/%m/%d/' + str(uuidDir) #??

structureFile = models.FileField(upload_to = dirFile)

aliphFile = models.FileField(upload_to = dirFile)

vdwFile = models.FileField(upload_to = dirFile)

distGlyc = models.FloatField()

defaultType = models.CharField(max_length = 8)

outputName = models.CharField(max_length = 10)

Is there a method that I can call on my uuidDir field to get his value or am I thinking completely wrong on this ? 

Thanks in advance for any help !

Amélie.

[Collin Anderson]

Roughly something like this:

def dir_file(analysis, file_name):  # should live outside your model
    return '%s/%s' % (analysis.uuidDir, file_name)

then models.FileField(upload_to=dir_file)

    

[Amelie Bacle]

Thanks for this, I was sure there were something to get access to the value of a field !