title: How do I set a NOT NULL constraint on Django charfield?
body: <p>I'm struggling with how I can set a NOT NULL constraint on a charfield.</p>
  <p>Currently, my model looks like this:</p>
  <pre><code>class Tutors(models.Model):
      first_name = models.CharField(max_length=20)
      last_name = models.CharField(max_length=20, blank=False)
      email = models.EmailField(max_length=254)
      birth_day = models.DateField(auto_now=False, auto_now_add=False)
  
      def __str__(self):
          return(self.first_name + ' ' + self.last_name)
  </code></pre>
  <p>I want to make sure that last_name and first_name can't be saved to the database as NOT NULL. Docs are confusing me a bit lol</p>