i want to make validation for two unique col with laravel

i have two colums type_id , size_id in table i want to make validation role to prevent user enter the same record

example this is database ( type_size_db)

type_id	size_id
type123	sm
type456	bg

if user enter this value (type123 , sm ) the validation will display this values was enterd but if user enter this value (type123 , bg) ,,,, >> will enterd successfully

in databas i make the two value unique $table->unique(['type_id', 'size_id']);

but the role of valdation not working will with me ! i need help

i am using laravel 5.8

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