Include and other filters not working with find() method in angular

[JhilmilM]

Hi

I have used openapi to generate loopback code fro my angular frontend application.
When I try to add any filter like include, where etc to find method, it does not show appropriate results. It returns entire array.
e.g. this.RestaurantControllerControllerService.find({include:['restaurantGroup']}) is not showing the restaurantGroup relation.
If I directly use following code I am getting relevant results:
http://localhost:3000/restaurants?filter[include][]=restaurantGroup

Please let me know if there is some particular way to pass params to find().