File Upload in Django 1.8 (Part - II)

In the previous tutorial, you learned how to upload a file and how Django manipulates file names automatically. However, in some situations you may also need to change the filename yourself before Django saves it. For example, you may wish to append the name of the person as a prefix to the filename. Here, you will see how.

Modify file2local/resume/models.py as follows:

Add a new function ownerpics and change

owner_pic=models.ImageField(upload_to = 'ownerpics')

to

owner_pic=models.ImageField(upload_to = ownerpics)

Note the absence of the quotes around ownerpics. The Django doc says that, the upload_to value may also be a callable, such as a function, which will be called to obtain the upload path, including the filename. This callable must be able to accept two arguments, and return a Unix-style path (with forward slashes) to be passed along to the storage system. The two arguments that will 

be passed are:

instance
 

An instance of the model where the FileField is defined. More specifically, this is the particular instance where the current file is being attached.

filename

The filename that was originally given to the file. This may or may not be taken into account when determining the final destination path.

 
---------------------------------code---------------------------------------------------  

 

def ownerpics(instance,filename):
    prefix = instance.owner_name.replace(' ','_')
    newfilename = prefix + '_' + filename
    return "ownerpics/" + newfilename

class Resume(models.Model):
    owner_name=models.CharField(max_length=40)
    owner_pic=models.ImageField(upload_to = ownerpics)

---------------------------------/code---------------------------------------------------

 Now, let's fill up the form and submit again.

On successful submission, you will find an entry in the database table as,

Note the name of the file. Originally it was photo.jpeg. After upload it got renamed to Isaac_Newton_photo.jpeg where Isaac Newton is the name of the owner.