Files
payloadcms/test/group-by/config.ts
Patrik 9c20eb34d4 fix(next): groupBy for polymorphic relationships (#13781)
### What?

Fixed groupBy functionality for polymorphic relationships, which was
throwing errors.

<img width="1099" height="996" alt="Screenshot 2025-09-11 at 3 10 32 PM"
src="https://github.com/user-attachments/assets/bd11d557-7f21-4e09-8fe6-6a43d777d82c"
/>

### Why?

The groupBy feature failed for polymorphic relationships because:
- `relationshipConfig` was undefined when `relationTo` is an array
(polymorphic)
- ObjectId serialization errors when passing database objects to React
client components
- hasMany relationships weren't properly flattened into individual
groups
- "No Value" groups appeared first instead of populated groups

### How?

- Handle polymorphic relationship structure `{relationTo, value}`
correctly by finding the right collection config using `relationTo`
- Add proper collection config lookup for each relation in polymorphic
relationships during populate
- Flatten hasMany relationship arrays so documents with `[Category1,
Category2]` create separate groups for each

---
- To see the specific tasks where the Asana app for GitHub is being
used, see below:
  - https://app.asana.com/0/0/1211331842191589
2025-09-23 10:14:35 -07:00

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TypeScript

import { lexicalEditor } from '@payloadcms/richtext-lexical'
import { fileURLToPath } from 'node:url'
import path from 'path'
import { buildConfigWithDefaults } from '../buildConfigWithDefaults.js'
import { CategoriesCollection } from './collections/Categories/index.js'
import { MediaCollection } from './collections/Media/index.js'
import { PostsCollection } from './collections/Posts/index.js'
import { RelationshipsCollection } from './collections/Relationships/index.js'
import { seed } from './seed.js'
const filename = fileURLToPath(import.meta.url)
const dirname = path.dirname(filename)
export default buildConfigWithDefaults({
collections: [PostsCollection, CategoriesCollection, MediaCollection, RelationshipsCollection],
admin: {
importMap: {
baseDir: path.resolve(dirname),
},
},
editor: lexicalEditor({}),
onInit: async (payload) => {
if (process.env.SEED_IN_CONFIG_ONINIT !== 'false') {
await seed(payload)
}
},
typescript: {
outputFile: path.resolve(dirname, 'payload-types.ts'),
},
})