Added before_action to set user for relevant 4 actions
Updated UsersController#create with mass assignment
In users#create, pulled user parameters out into a standalone hash
Upgraded new user form to use form_for view helper method, but it doesn't work due to mass assignment security checks
Solved mass assignment security issue by adding user_params strong parameters method
Upgraded edit user form to use form_for view helper method, and UsersController#update to use mass assignment
Extracted new user form into a partial view template
Re-used form partial in users edit form template
Added helpful flash messages to users controller
Longhand way of declaring how to respond to users#index action
Enhanced users#index to respond to requests for JSON
Enhanced users#show to respond to requests for JSON
Extracted users#index JSON response into a JSON builder template
Extracted users#show JSON response into a JSON builder template
Completed scaffold transition