Django - FileField check if None

Question

I have a model with an optional file field

class MyModel(models.Model):
  name = models.CharField(max_length=50)
  sound = models.FileField(upload_to='audio/', blank=True)

Let's put a value

>>> test = MyModel(name='machin')
>>> test.save()

Why do I get that ?

>>> test.sound
<FieldFile: None>
>>> test.sound is None
False

How can I check if there is a file set ?

score 122 · Accepted Answer · edited Mar 16 '22 at 14:40

122

if test.sound.name: 
     print "I have a sound file"
else:   
     print "no sound"

Also, FileField's boolean value will be False when there's no file: bool(test.sound) == False when test.sound.name is falsy.

edited Mar 16 '22 at 14:40

Akaisteph7

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answered Jan 13 '12 at 12:24

AdamKG

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Which boolean value ? Do you mean `test.sound is False` ? – Pierre de LESPINAY Jan 13 '12 at 12:32
6

Not `is` - test.sound won't have the same identity as `False`. However, `if test.sound: print "yes"`, `else: print "no"` should print no. `bool(test.sound)` should be `False`. – AdamKG Jan 13 '12 at 12:33
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+1: `bool(fieldFile)` is `False` when `fieldFile.name` is falsy. – Dzinx Jan 13 '12 at 12:35

score 0 · Answer 2 · edited May 11 '20 at 15:08

0

According to this answer from a different question, you can try this:

class MyModel(models.Model):
  name = models.CharField(max_length=50)
  sound = models.FileField(upload_to='audio/', blank=True)

def __nonzero__(self):
    return bool(self.sound)

edited May 11 '20 at 15:08

Daniel Holmes

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answered May 06 '20 at 02:39

Kirill Vladi

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Django - FileField check if None

2 Answers2

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