common statements
array 内元素大小写
array.map(&:upcase) # to Upper case
array.map(&:downcase) # to down case
How can I uppercase each element of an array?
show parameter inpect without HTML entitiies
In view, just use <%= raw parameter.inspect %>
For example, we pass a @user parameter to the view, the @usr = “;nbsp”, it will put a “ “ instead.
url parameters
request.request_uri request.fullpath request.path https://stackoverflow.com/questions/2165665/how-do-i-get-the-current-absolute-url-in-ruby-on-rails