Polymorphism in Ecto schemas

[Eiji]

@pdilyard: I recommend to write Ecto extension for it (for all validation things). You can find all my ideas for Ecto extensions here:

Things that could be helpful from my experience in Ecto (plug-in)

Hey, I worked on some projects and I collected some of my notes/propositions for Ecto or Ecto library/plug-in: exactly_one_of: useful when designing polymorphic associations, for example: when casting source association we check if exactly one of source exists (is not nil) when fetching comments we could allow to load association source dynamically defmodule MyApp.Comment do use Ecto.Schema # schema schema "comments" do belongs_to :author, MyApp.User exactly_one_of as…