From 68ac5f24ddbbbd544498c3193a38f5408f05e2bb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Valim?= <jose.valim@dashbit.co>
Date: Thu, 11 Jan 2024 16:23:26 +0100
Subject: [PATCH] Set pool size to the numbers of schedulers online

By default, ExUnit runs schedulers_online() * 2
tests concurrently, therefore we need to have the
same amount of DB connections available to avoid
checkout errors.
---
 installer/lib/phx_new/generator.ex | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/installer/lib/phx_new/generator.ex b/installer/lib/phx_new/generator.ex
index de8284e2e5..3acef5ad15 100644
--- a/installer/lib/phx_new/generator.ex
+++ b/installer/lib/phx_new/generator.ex
@@ -358,7 +358,7 @@ defmodule Phx.New.Generator do
         hostname: "localhost",
         database: {:literal, ~s|"#{app}_test\#{System.get_env("MIX_TEST_PARTITION")}"|},
         pool: Ecto.Adapters.SQL.Sandbox,
-        pool_size: 10
+        pool_size: {:literal, ~s|System.schedulers_online() * 2|}
       ],
       test_setup_all: "Ecto.Adapters.SQL.Sandbox.mode(#{inspect(module)}.Repo, :manual)",
       test_setup: """