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How can I set a default value for FloatField in django.

Initially when I had created the model and declared the float field as:

cost = models.FloatField(null=True, blank=True)

and db also created successfully through south migration.

But now when I am trying to do edit on that field using the html form, and no value is entered in the cost field, in the form its throwing value error. Thus I think if I can set a default value for cost field it may fix the problem.

But I don't know how to set a default value for FloatField in django.

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  • 3
    Doesn't cost = models.FloatField(null=True, blank=True, default=0.0) work? Commented Nov 30, 2012 at 7:06
  • May we assume that you would like to display something like "None" or "Free" for items that have no cost? I.e. a default of 0.0 will not suffice? Commented Mar 21, 2013 at 1:59

2 Answers 2

Reset to default
21

Your code should work. Perhaps something is setting the empty value to a non-null value (like an empty string). I'd have to see the full error message.

Since this is an old thread, I'm going to post the answer to the question I came here for, "How do you set FloatField default to Null in the database?"

cost = models.FloatField(null=True, blank=True, default=None)
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10

Float Field is quite related to Decimal Field so, probably it should take a default argument. Try doing this..

cost = models.FloatField(default=to_some_value)
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1 Comment

If you are giving a default value you don't need to set null and blank attributes

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