From b4102e983e663460ed910d1294a5084dde2050fd Mon Sep 17 00:00:00 2001
From: April Arcus <april.arcus@gmail.com>
Date: Wed, 15 Apr 2026 13:13:58 -0700
Subject: [PATCH] Fix SSR PostGraphile access for Next 15 dev

Next 15 dev wraps page requests in a Proxy. Accessing `req.app` through
that wrapper can interact badly with Express because the Express app is
both a callable function and an object with route helpers. In practice,
our SSR Apollo setup could end up tripping Express path handling with a
non-string value, causing:

  TypeError: path.replace is not a function

during `getDataFromTree`.

Read the PostGraphile instance from the Express app once while installing
SSR, then attach it directly to each SSR request as `req.pgl`. The
server-side Apollo link now reads `req.pgl` instead of reaching back
through `req.app.get("pgl")` during page rendering.

This keeps SSR independent of Next's request proxy behavior and avoids
accidentally invoking Express routing internals while building the
server-side GraphQL link.
---
 @app/lib/src/withApollo.tsx              | 2 +-
 @app/server/src/middleware/installSSR.ts | 9 ++++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/@app/lib/src/withApollo.tsx b/@app/lib/src/withApollo.tsx
index a010b31..2b6308e 100644
--- a/@app/lib/src/withApollo.tsx
+++ b/@app/lib/src/withApollo.tsx
@@ -90,7 +90,7 @@ function makeServerSideLink(req: any, res: any) {
   return new GraphileApolloLink({
     req,
     res,
-    pgl: req.app.get("pgl"),
+    pgl: req.pgl,
   });
 }
 
diff --git a/@app/server/src/middleware/installSSR.ts b/@app/server/src/middleware/installSSR.ts
index 52ac179..1416488 100644
--- a/@app/server/src/middleware/installSSR.ts
+++ b/@app/server/src/middleware/installSSR.ts
@@ -5,6 +5,7 @@ import type { GraphileApp } from "@app/lib" with {
 import { type Express } from "express";
 import { createServer } from "http";
 import next from "next";
+import { type PostGraphileInstance } from "postgraphile";
 
 import { getUpgradeHandlers } from "../app";
 
@@ -38,14 +39,20 @@ export default async function installSSR(app: Express) {
     console.error(e);
     process.exit(1);
   });
+
+  const pgl = app.get("pgl") as PostGraphileInstance;
+
   app.get("*", async (req, res) => {
-    const handler = await handlerPromise;
     const graphileApp: GraphileApp = {
       CSRF_TOKEN: req.csrfToken(),
       ROOT_URL: process.env.ROOT_URL || "http://localhost:5678",
       ...(process.env.T_AND_C_URL && { T_AND_C_URL: process.env.T_AND_C_URL }),
     };
+
     (req as any).graphileApp = graphileApp;
+    (req as any).pgl = pgl;
+
+    const handler = await handlerPromise;
     handler(req, res);
   });