語法備忘錄
#會顯示出字串"foo" <%= some_variable ="foo"%> #不會顯示字串"foo" <% some_variable ="foo"%>
#cost初始值要>(大於)0 validates_numericality_of :cost, :greater_than => 0
#會顯示出字串"foo" <%= some_variable ="foo"%> #不會顯示字串"foo" <% some_variable ="foo"%>
#cost初始值要>(大於)0 validates_numericality_of :cost, :greater_than => 0