CODEWITHSUNDEEP
django
Andrew
Andrew

Reputation: 3999

Django check to see if field is blank?

I retrieved an object from my database. This object has a foreign key field, with the attribute blank=True. How can I check to see if it was actually left blank?

Thanks for the help!

Upvotes: 37

Views: 65208

Answers (1)

Yuji 'Tomita' Tomita
Yuji 'Tomita' Tomita

Reputation: 118538

blank=True is just telling the admin site that the field can be left blank.

Unless you set null=True as well, your database should complain if you tried to enter a blank value.

If your foreign key field can take null values, it will return None on null, so to check if it was "left blank", you could simply check if the field is None.

>>>   obj.foreignkeyfield is None
True


if not obj.foreignkeyfield:
    print "This field was left blank"

Upvotes: 49

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