9.1.2GREEN
list9.10GREEN
list9.12GREEN
list9.15GREEN
list9.19GREEN_[:session]
user = User.find_by(email: params[:session][:email].downcase)
if user && user.authenticate(params[:session][:password])

patch

user = User.find_by(email: params[:email].downcase)
if user && user.authenticate(params[:password])
list9.27GREEN
list9.34GREEN
list9.37GREEN
list9.39GREEN
list9.46GREEN