I figured out how to rollback with git from this website:
http://www-cs-students.stanford.edu/~blynn/gitmagic/ch02.html#_advanced_undo_redo
$ git log
commit 1964b4f78d82da730ccf5fc6d1ba7d1e1b5ae266
Author: me
Date: Wed Apr 22 18:57:48 2009 -0600
End of chapter 7, p. 96
commit a262fdcd503766cae2c5643923180480151ff669
Author: me
Date: Tue Apr 21 03:28:49 2009 -0600
Initial import
/depot$ git reset --hard 1964b4f78d82da730ccf5fc6d1ba7d1e1b5ae266
HEAD is now at 1964b4f End of chapter 7, p. 96
$
However, apparently doing a rollback doesn't delete the new files you
created since the last commit. So, I also deleted the migration file
for creating the sessions table.
Then I started over with the steps at the beginning of the chapter.
After adding all the necessary code, I clicked on the add to cart
button, and I get the same error message:
http://localhost:3000/store/add_to_cart/5
We're sorry, but something went wrong.
We've been notified about this issue and we'll take a look at it
shortly.
So it seems like there is something wrong with my database.
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