Question

I have two objects @tracks (an enumerable) and @artist, and I’d like to create an enumerable with all the tracks and the artist in them. This is so that I can pass them to a method which will do (each track, and the artist have change events):

change_events = object.map(&:change_events).flatten

My idea was:

objects = @artist.tracks
objects << @artist

but that gives me this error for the second line (which makes sense, but I don’t know how to fix):

Track(#17816) expected, got Artist(#17572)

Any ideas on how I could do this would be appreciated!

Answer 1

This (the error) signals that it (the return value of @artist.tracks) is not an array you are dealing with, but some rails-specific data type. You could try

objects = @artist.tracks.to_a
objects << @artist

But using inhomogeneous values in an array is often not good, if they all respond to the method you need you should be good though.