implement migration handling script

Dockerfile

@@ -54,6 +54,7 @@ RUN chown nextjs:nodejs .next
 # https://nextjs.org/docs/advanced-features/output-file-tracing
 COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
 COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+COPY --from=builder --chown=nextjs:nodejs /app/handle-migrations.js ./
 COPY --from=builder --chown=nextjs:nodejs /app/migrate-and-start.sh ./
 COPY --from=builder --chown=nextjs:nodejs /app/prisma ./prisma
 

handle-migrations.js

@@ -0,0 +1,47 @@
+/* eslint-disable no-console */
+import { PrismaClient } from '@prisma/client';
+import { execSync } from 'child_process';
+import dotenv from 'dotenv';
+
+dotenv.config();
+
+const prisma = new PrismaClient();
+
+/**
+ * This function checks if the database is in a state where the workaround is needed.
+ * 
+ * The workaround is needed when the database is not empty and the _prisma_migrations
+ * table does not exist.
+ */
+async function shouldApplyWorkaround() {
+  const tables = await prisma.$queryRaw`
+    SELECT table_name 
+    FROM information_schema.tables 
+    WHERE table_schema = 'public' AND table_type = 'BASE TABLE'`;
+
+  const databaseNotEmpty = tables.length > 0;
+  const migrationsTableExists = tables.some(table => table.table_name === '_prisma_migrations');
+
+
+  return !migrationsTableExists && databaseNotEmpty;
+}
+
+
+async function handleMigrations() {
+  try {
+    if (await shouldApplyWorkaround()) {
+      console.log('Workaround needed! Running: prisma migrate resolve --applied 0_init');
+      execSync('npx prisma migrate resolve --applied 0_init', { stdio: 'inherit' });
+    }
+
+    console.log('Running: prisma migrate deploy');
+    execSync('npx prisma migrate deploy', { stdio: 'inherit' });
+  } catch (error) {
+    console.error('Error during migration process:', error);
+    process.exit(1);
+  } finally {
+    await prisma.$disconnect();
+  }
+}
+
+handleMigrations();

migrate-and-start.sh

@@ -1,4 +1,4 @@
 #!/bin/sh
 
-npx prisma migrate deploy
+node handleMigrations.js
 node server.js

package.json

@@ -12,10 +12,7 @@
     "ts-lint": "SKIP_ENV_VALIDATION=true tsc --noEmit --incremental",
     "ts-lint:watch": "SKIP_ENV_VALIDATION=true tsc --noEmit --incremental --watch",
     "start": "next start",
-    "start:prod": "cross-env NODE_ENV=production pnpm db:migrate:prod && next start",
-    "db:push": "cross-env NODE_ENV=development prisma db push",
-    "db:migrate:prod": "cross-env NODE_ENV=production prisma migrate deploy",
-    "vercel-build": "prisma generate && prisma migrate deploy && next build",
+    "vercel-build": "node ./handle-migrations.js && next build",
     "knip": "knip",
     "test": "vitest"
   },

postinstall.js

@@ -5,9 +5,3 @@ import { execSync } from 'child_process';
 
 // Always run prisma generate
 execSync('prisma generate', { stdio: 'inherit' });
-
-// Only run prisma db push if VERCEL_ENV is production
-// eslint-disable-next-line no-process-env
-if (process.env.VERCEL_ENV === 'production') {
-  execSync('prisma db push', { stdio: 'inherit' });
-}