fix(db-postgres): joins count with hasMany relationships (#14008)

Fixes https://github.com/payloadcms/payload/issues/13950

packages/drizzle/src/find/traverseFields.ts

@@ -1,4 +1,3 @@
-import type { SQL } from 'drizzle-orm'
 import type { LibSQLDatabase } from 'drizzle-orm/libsql'
 import type { SQLiteSelect, SQLiteSelectBase } from 'drizzle-orm/sqlite-core'
 
@@ -730,17 +729,24 @@ export const traverseFields = ({
           const subQuery = query.as(subQueryAlias)
 
           if (shouldCount) {
+            let countSubquery: SQLiteSelect = db
+              .select(selectFields as any)
+
+              .from(newAliasTable)
+              .where(subQueryWhere)
+              .$dynamic()
+
+            joins.forEach(({ type, condition, table }) => {
+              countSubquery = countSubquery[type ?? 'leftJoin'](table, condition)
+            })
+
             currentArgs.extras[`${columnName}_count`] = sql`${db
               .select({
                 count: count(),
               })
-              .from(
-                sql`${db
-                  .select(selectFields as any)
-                  .from(newAliasTable)
-                  .where(subQueryWhere)
-                  .as(`${subQueryAlias}_count_subquery`)}`,
-              )}`.as(`${subQueryAlias}_count`)
+              .from(sql`${countSubquery.as(`${subQueryAlias}_count_subquery`)}`)}`.as(
+              `${subQueryAlias}_count`,
+            )
           }
 
           currentArgs.extras[columnName] = sql`${db

test/joins/int.spec.ts

@@ -215,6 +215,18 @@ describe('Joins Field', () => {
     expect(categoryWithPosts.group.relatedPosts?.totalDocs).toBe(15)
   })
 
+  it('should count hasMany relationship joins', async () => {
+    const res = await payload.findByID({
+      id: category.id,
+      collection: categoriesSlug,
+      joins: {
+        hasManyPosts: { limit: 1, count: true },
+      },
+    })
+
+    expect(res.hasManyPosts?.totalDocs).toBe(15)
+  })
+
   it('should populate relationships in joins', async () => {
     const { docs } = await payload.find({
       limit: 1,