So I have found a pothole and I am not sure what the solution is. I have a pretty standard JSON api in phoenix, I am using ecto, and I am mapping those to maps inside the ThingJSON this is all pretty standard. Now depending on the route, the controller might decide it doesn’t want to preload some …

I don’t think there’s anything wrong with the way you’re handling it. I have done similar although I had a util that constructed the json with variable guards, among them filtering out unloaded associations–something like this: def serialize(data) do Map.flat_map(data, fn {field, %Ecto.Assoc…

You can pattern match on Ecto.AssocNotLoaded and then have the map construction not include the key in that clause, or you can put nil and then have Enum.reject that deletes any map pairs with a nil value. Either one would be just fine.

Elixir Programming Language Forum

Conditionally construct map

Questions & Help Questions

gregvaughn July 1, 2024, 9:54pm 4

I’d likely use a filter or guard is_list(shipyard.ships)