In MySQL, you can order by a boolean value like this:
SELECT ... FROM ... ORDER BY (gender = 'male') DESC;
If gender = ‘male’ for a row, that row will have a 1/TRUE. Otherwise, it will have 0/FALSE. => Sorting desc put the rows that have TRUE first.
After that, I try using this command in Rails console:
this command is ok, show list users, order by id. But when I type:
User.order("FALSE ASC"), it raises an error. Why?
Cause TRUE ~= 1 => order by TRUE ~= Order by 1 => Order by first column. Order by FALSE ~= Order by 0 => Order by 0 column => Error