I have fields hr
and min
, both integers in my application. For hr
field, if the user enters "1" I would like Rails to automatically pad it to "01" before saving it to the database. Also for the min
field if the user enter "0" it should put in as "00".
How can I do this?
ベストアンサー1
It'd be better to store it as an integer and just display it as you described on runtime. Every language has its own way to pad zeros - for Ruby you can use String#rjust. This method pads a string (right-justified) so that it becomes a given length, using a given padding character.
str.rjust(integer, padstr=' ') → new_str
If
integer
is greater than the length ofstr
, returns a newString
of lengthinteger
withstr
right justified and padded withpadstr
; otherwise, returnsstr
.
some_int = 5
some_int.to_s.rjust(2, '0') # => '05'
some_int.to_s.rjust(5, '0') # => '00005'
another_int = 150
another_int.to_s.rjust(2, '0') # => '150'
another_int.to_s.rjust(3, '0') # => '150'
another_int.to_s.rjust(5, '0') # => '00150'