prisma-relay-cursor-connection

Extend Prisma's findMany method to support Relay Cursor Connections

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Installation •
Usage •
Contributing •
Contributors •
License

Installation

``bash
yarn add @devoxa/prisma-relay-cursor-connection
`

This module has a peer dependency on @prisma/client. You can check the supported versions in the
package.json (peerDependencies).

Usage

$3

This module validates the connection arguments to make sure they work with Prisma. The following
combinations are supported:

- {} All resources
- { first: number } The first X resources
- { first: number, after: string } The first X resources after the id Y
- { last: number } The last X resources
- { last: number, before: string } The last X resources before the id Y

Two cases need to be checked in your code if you are passing in user-provided data to prevent the
user from reading out too many resources at once:

- One of first | last has to be defined
- first | last have to be below a reasonable maximum (e.g. 100)

`ts
import {
findManyCursorConnection,
ConnectionArguments,
} from '@devoxa/prisma-relay-cursor-connection'

const result = await findManyCursorConnection(
(args) => client.todo.findMany(args),
() => client.todo.count(),
{ first: 5, after: '5c11e0fa-fd6b-44ee-9016-0809ee2f2b9a' } // typeof ConnectionArguments
)
`

$3

You can also use additional FindManyArgs while keeping type safety intact:

`ts
import { findManyCursorConnection } from '@devoxa/prisma-relay-cursor-connection'

const baseArgs = {
select: { id: true, isCompleted: true },
where: { isCompleted: true },
}

const result = await findManyCursorConnection(
(args) => client.todo.findMany({ ...args, ...baseArgs }),
() => client.todo.count({ where: baseArgs.where }),
{ last: 5, before: '5c11e0fa-fd6b-44ee-9016-0809ee2f2b9a' }
)

// Type error: Property text does not exist
result.edges[0].node.text
`

$3

By default, the cursor is the id field of your model. If you would like to use a different field,
a compound index, or handle encoding/decoding, you can pass the following options:

`ts
import { findManyCursorConnection } from '@devoxa/prisma-relay-cursor-connection'

const result = await findManyCursorConnection(
(args) => client.todo.findMany(args),
() => client.todo.count(),
{ first: 5, after: 'eyJpZCI6MTZ9' },
{
getCursor: (record) => ({ id: record.id }),
encodeCursor: (cursor) => Buffer.from(JSON.stringify(cursor)).toString('base64'),
decodeCursor: (cursor) => JSON.parse(Buffer.from(cursor, 'base64').toString('ascii')),
}
)
`

You can find more examples for custom cursors in the unit tests.

$3

By default, the edge consists of the cursor and the node. If you would like to add additional
fields to the edge or the node, you can pass the following option:

`ts
import { findManyCursorConnection } from '@devoxa/prisma-relay-cursor-connection'

const result = await findManyCursorConnection(
(args) => client.todo.findMany(args),
() => client.todo.count(),
{ first: 5, after: 'eyJpZCI6MTZ9' },
{
recordToEdge: (record) => ({
node: { ...record, extraNodeField: 'Foo' },
extraEdgeField: 'Bar',
}),
}
)
`

Out-of-the box this will have the revised types inferred for you.

$3

You can pass GraphQL resolve information into the options to automatically remove extra Prisma
queries for fields that are not present in your GraphQL query. This is mainly useful if you are not
using totalCount for your pagination logic or you only want to query totalCount without any
edges.

`ts
import { findManyCursorConnection } from '@devoxa/prisma-relay-cursor-connection'
import { GraphQLResolveInfo } from 'graphql'

const resolveInfo: GraphQLResolveInfo = {
// ...
}

const result = await findManyCursorConnection(
(args) => client.todo.findMany(args),
() => client.todo.count(),
{ first: 5, after: '5c11e0fa-fd6b-44ee-9016-0809ee2f2b9a' },
{ resolveInfo }
)
`

Contributing

`bash


Setup the test database

yarn prisma migrate dev --preview-feature

Run the tests

yarn test
``

Contributors

Thanks goes to these wonderful people (emoji key):

David Reeß 💻 📖 ⚠️	Sean Matheson 💻 ⚠️	Marc 💻	Jeong Seong Dae 💻 ⚠️	Ahmet Uysal 💻 ⚠️	Nick Randall 💻	Igor Urminček 📖
Alex Schrimpf 💻	Marina Riera 💻	Kervin Vasquez 💻 ⚠️	Jeff Gu Kang 📖	Orta Therox 💻 📖 ⚠️	Kareem-Medhat 💻

This project follows the all-contributors
specification. Contributions of any kind welcome!

License

MIT