Need advise to update nested list 3-level

[codeanpeace]

The combination of the Access module with the Kernel functions update_in/3 and put_in/3 is very useful for updating nested data structures.

Help composing/abstracting list of keys to traverse nested data structures using the Access module

Hello, I’m looking to dry up some LiveView handle_info/event callbacks that require modifying a nested data structure using update_in/3 in response to CRUD, or rather CUD, actions. The second parameter for update_in/3 is a list of keys that are often functions from the Access module e.g. Access.key!/2 and Access.filter/2. For the sake of a concrete example, Person has many Pets, Pet has many Toys, and there are callbacks that update a preloaded person struct assigned to the socket after a user …