feat: builds multi-tenant example (#2689)

* feat: builds multi-tenant example

* chore: updates seed script logic

examples/multi-tenant/src/collections/Pages/hooks/formatSlug.ts

@@ -0,0 +1,27 @@
+import type { FieldHook } from 'payload/types'
+
+const format = (val: string): string =>
+  val
+    .replace(/ /g, '-')
+    .replace(/[^\w-]+/g, '')
+    .toLowerCase()
+
+const formatSlug =
+  (fallback: string): FieldHook =>
+  ({ operation, value, originalDoc, data }) => {
+    if (typeof value === 'string') {
+      return format(value)
+    }
+
+    if (operation === 'create') {
+      const fallbackData = data?.[fallback] || originalDoc?.[fallback]
+
+      if (fallbackData && typeof fallbackData === 'string') {
+        return format(fallbackData)
+      }
+    }
+
+    return value
+  }
+
+export default formatSlug