[Rails] validate date tru timestart,timeend

hi im new in ruby on rails development im just wonder if you guys can
help me with my little project which is a reservation system

i have a date,start_time and end_time and i want to validate if the time
is taken in the particular date. i read about scope validation validates
:date ,:uniqueness => { :scope => :timeEnd, :timeStart } but i guess i
have to do something else i think this is a implementation problem not
technically a logic problem or error bugs like that stuffs

do guys have suggestions for how can i solve this? thank in advance more
power to us all

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