Composite Primary Key watcher fails

[dv01sw]

In my application.ex:

  {EctoWatch,
   repo: Bla.Repo,
   pub_sub: Bla.PubSub,
   watchers: [
     {Bla.Things, :inserted}
   ]},

In my schema:

  @primary_key false
  schema "things" do
    field :timestamp, :utc_datetime, primary_key: true
    field :something, :string, primary_key: true
    field :other, :string
  end

In WatcherOptions, Line 32 it crashes:

  [primary_key] = schema_mod.__schema__(:primary_key)

schema_mod.schema(:primary_key) returns a list of two keys, which cannot be matched to [primary_key]

[cheerfulstoic]

I'm pretty sure that is on purpose because I think I recall that supporting multiple primary keys might have been tricky, so I just hard-coded the match to one.

But I can take a look to see what would be involved in supporting more than one primary key. If I had to guess it's a difficulty in the PubSub topics that are being used. Maybe there's a limit on the name length? It also might be that the auto-generated trigger/function in postgreSQL might just get too long.