Django: Avoid "This field is required." message in the custom admin view.

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Problem: 

 Avoid "This field is required." message in the custom Django admin view when trying to save an object.

Solution:

 blank=True for the corresponding field in models.py will allow you to save an object without that field filled in when trying to save an object.

For example:

my_year = models.DateField(null=True, blank=True)

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