package Ġcom . pre z . db ; Ċ Ċ import Ġcom . pre z . model . Customer Preferences Ċ import Ġorg . springframework . data . mongodb . repository . Reactive Mongo Repository Ċ import Ġreactor . core . publisher . Flux Ċ Ċ interface ĠCustomer Preferences Repository Ġ: ĠReactive Mongo Repository < Customer Preferences , ĠString > Ġ{ ĊĠĠĠ Ġfun ĠfindBy CustomerId ( customer Id : ĠString ): ĠFlux < Customer Preferences > Ċ } Ċ