rename a model field

I have models.py

title                  = models.CharField(max_length=80)

to this

ic_name                = models.CharField(max_length=80)

I don't want to delete the field.

I have this option 
class Migration:


    def forwards(self, orm):
 
        # Rename 'name' field to 'full_name'
        db.rename_column('app_foo', 'name', 'full_name')
 

Its giving me an error

Caught TypeError while rendering: coercing to Unicode: need string or buffer, tuple found

I will appreciate if anyone can tell me a easy way.Thanks in advance
 

--
Regards
Nikhil Verma
+91-958-273-3156

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