Django - makemigrations - No changes detected
The possible reason could be deletion of the existing db file and migrations folder
you can use python manage.py makemigrations <app_name> this should work. I once faced a similar problem.
I was trying to create migrations within an existing app using the makemigrations command but it outputs "No changes detected".
Usually I create new apps using the startapp command but did not use it for this app when I created it.
After debugging, I found that it is not creating migration because the migrations package/folder is missing from an app. 
Would it be better if it creates the folder if it is not there or am I missing something?