It is a helper only, to make it easy to display a list of chats with other people, ordered by last bump. The actual messages are retrieved by querying the recipients of the ChatMessages.
"""
+ @primary_key {:id, FlakeId.Ecto.CompatType, autogenerate: true}
+
schema "chats" do
belongs_to(:user, User, type: FlakeId.Ecto.CompatType)
field(:recipient, :string)
|> changeset(%{user_id: user_id, recipient: recipient})
|> Repo.insert(
on_conflict: [set: [updated_at: NaiveDateTime.utc_now()]],
+ returning: true,
conflict_target: [:user_id, :recipient]
)
end