9.1.1 edit form
9.1.2 green unsuccessful edits
9.1.3 green successful edits
9.2.1 green requiring signed-in users
9.2.2 green requiring the right user
9.2.3 green friendly forwarding
9.3.1 green user index
9.3.2 load sample users
9.3.3 gree pagination
9.3.4 green partial refactoring
9.4.1 green admin users
9.4.2 green the destroy action
instantiate admin within sample data
10.1.1 green the basic model
10.1.2 validate presence of user_id attribute
10.1.3 green user/micropost associations
10.1.4 green micropost refinements
10.1.5 green content validations
10.2.1 augment the user show page
10.2.2 add microposts to the sample data