Add requires Postgres Error Handler module

lib/addict/postgres_error_handler.ex

@@ -0,0 +1,30 @@
+defmodule PostgresErrorHandler do
+  @moduledoc """
+  Handles Postgres errors and provides friendly messages on known failures.
+  """
+  require Logger
+
+  @doc """
+  Handles errors for Addict Repository interactions.
+  """
+  def handle_error(Addict.Repository, postgres_error) do
+    case postgres_error.postgres.code do
+      "23505" -> {:error, "User already exists"}
+      _ -> handle_unknown_error(postgres_error.postgres)
+    end
+  end
+
+  @doc """
+  Handles generic errors.
+  """
+  def handle_error(_, postgres_error) do
+    handle_unknown_error(postgres_error.postgres)
+  end
+
+  defp handle_unknown_error(postgres_error) do
+    Logger.debug "unknown error caught: #{postgres_error.code}"
+    IO.inspect postgres_error
+    {:error, "Unknow error: #{postgres_error.code}"}
+  end
+
+end