persisting in postgres

lib/elixir_ai/data/conversation.ex

@@ -0,0 +1,26 @@
+defmodule ElixirAi.Conversation do
+  import Ecto.Query
+  alias ElixirAi.Repo
+
+  def all_names do
+    Repo.all(from c in "conversations", select: c.name)
+  end
+
+  def create(name) do
+    case Repo.insert_all("conversations", [[id: Ecto.UUID.generate(), name: name, inserted_at: now(), updated_at: now()]]) do
+      {1, _} -> :ok
+      _ -> {:error, :db_error}
+    end
+  rescue
+    e in Ecto.ConstraintError -> if e.constraint == "conversations_name_index", do: {:error, :already_exists}, else: {:error, :db_error}
+  end
+
+  def find_id(name) do
+    case Repo.one(from c in "conversations", where: c.name == ^name, select: c.id) do
+      nil -> {:error, :not_found}
+      id -> {:ok, id}
+    end
+  end
+
+  defp now, do: DateTime.truncate(DateTime.utc_now(), :second)
+end