enable prisma previes features via keystone config (#6574)

Co-authored-by: Tim Leslie <[email protected]>

.changeset/silly-gifts-sin.md

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+---
+'@keystone-next/prisma-preview-features': minor
+'@keystone-next/keystone': minor
+---
+
+Enable prisma preview features via keystone config

examples/prisma-preview-features/README.md

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+## Feature Example - Prisma Preview Features
+
+This project demonstrates how to use the prisma preview features with custom queries .
+It builds on the [extend-graphql-schema](../extend-graphql-schema) starter project.
+
+## Instructions
+
+To run this project, clone the Keystone repository locally then navigate to this directory and run:
+
+```shell
+yarn dev
+```
+
+This will start the Admin UI at [localhost:3000](http://localhost:3000).
+You can use the Admin UI to create items in your database.
+
+You can also access a GraphQL Playground at [localhost:3000/api/graphql](http://localhost:3000/api/graphql), which allows you to directly run GraphQL query `exampleWithPrismaPreviewFeatures`.
+
+## Features
+
+This project demonstrates how to use the Prisma Preview Features like `orderRelation`.

examples/prisma-preview-features/custom-schema.ts

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+import { graphQLSchemaExtension } from '@keystone-next/keystone';
+
+export const extendGraphqlSchema = graphQLSchemaExtension({
+  typeDefs: `
+    type Query {
+      exampleWithPrismaPreviewFeatures: [Task]
+    }
+  `,
+  resolvers: {
+    Query: {
+      exampleWithPrismaPreviewFeatures: async (root, args, context) => {
+        const data = await context.prisma.task.findMany({
+          orderBy: {
+            assignedTo: {
+              name: 'desc',
+            },
+          },
+        });
+        return data;
+      },
+    },
+  },
+});

examples/prisma-preview-features/keystone.ts

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+import { config } from '@keystone-next/keystone';
+import { lists } from './schema';
+import { extendGraphqlSchema } from './custom-schema';
+
+export default config({
+  db: {
+    provider: 'sqlite',
+    url: process.env.DATABASE_URL || 'file:./keystone-example.db',
+    prismaPreviewFeatures: ['orderByRelation'],
+  },
+  lists,
+  extendGraphqlSchema,
+});

examples/prisma-preview-features/package.json

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+{
+  "name": "@keystone-next/prisma-preview-features",
+  "version": "0.0.0",
+  "private": true,
+  "license": "MIT",
+  "scripts": {
+    "dev": "keystone-next dev",
+    "start": "keystone-next start",
+    "build": "keystone-next build",
+    "seed-data": "keystone-next --seed-data"
+  },
+  "dependencies": {
+    "@keystone-next/keystone": "^25.0.0"
+  },
+  "devDependencies": {
+    "typescript": "^4.4.3"
+  },
+  "engines": {
+    "node": "^12.20 || >= 14.13"
+  },
+  "repository": "https://github.com/keystonejs/keystone/tree/master/examples/prisma-preview-features"
+}