title: How to customize a specific TextField inside the Django admin not all?
body: <p>I have two <code>TextField</code> in my model. But i want to change the rows and cols attribute of only of the <code>TextField</code>. I know from <a href="https://stackoverflow.com/questions/18738486/control-the-size-textarea-widget-look-in-django-admin">this</a> page that the look of <code>TextField</code> can be changed using the following code in the <code>admin.py</code>.</p>
  
  <pre><code>class RulesAdmin(admin.ModelAdmin):
  formfield_overrides = {
      models.TextField: {'widget': Textarea(
                         attrs={'rows': 1,
                                'cols': 40})},
  }
  
  ...
  admin.site.register(Rules, RulesAdmin)
  </code></pre>
  
  <p>As I said, using the above code changed the look of both the <code>TextField</code>, I want only to change one of those here is how my model looks like:</p>
  
  <pre><code>class Post(models.Model):
      title = models.CharField(max_length=200)
      content = models.TextField()
      pub_date = models.DateTimeField(auto_now_add=True)
      update_date = models.DateTimeField(auto_now=True)
      meta = models.TextField(blank=True)
  
      def __str__(self):
          return self.title
  </code></pre>
  
  <p>I want only to change the look of <code>meta</code> field. </p>
  
  <p>How should I go about this ?</p>