pothos-prisma-generator

Overview

Automatic generation of GraphQL schema from prisma schema.

Generate a GraphQL schema from prisma.schema that can be queried as follows.

prisma.schema -> queries.graphql

• count
• findUnique
• findFirst
• findMany
• createOne
• createMany
• updateOne
• updateMany
• deleteOne
• deleteMany

The schema is generated internally at runtime, so no text output of the code is performed.

Sample code

• Next.js
  • https://github.com/SoraKumo001/next-pothos
  • Deployed on Vercel
    https://next-pothos.vercel.app/
• NestJS
  • https://github.com/SoraKumo001/nest-pothos
  • Deployed on Render.com
    https://nest-pothos.onrender.com

Builder Settings

Add PrismaPlugin,PrismaUtil,PothosPrismaGeneratorPlugin
ScopeAuthPlugin must also be added when using the authorization function.

By setting replace and authority in pothosPrismaGenerator, you can refer to user information to separate the data to be inserted and the conditions to be applied.

The following settings are made by default. To disable, use autoScalers: false.

builder.addScalarType("BigInt" as never, BigIntResolver, {});
builder.addScalarType("Bytes" as never, ByteResolver, {});
builder.addScalarType("DateTime" as never, DateTimeResolver, {});
builder.addScalarType("Json" as never, JSONResolver, {});
builder.addScalarType("Decimal" as never, HexadecimalResolver, {});

• Here is an example of Builder settings

import SchemaBuilder from "@pothos/core";
import PrismaPlugin from "@pothos/plugin-prisma";
import PrismaTypes from "./generated/pothos-types";
import { Context, prisma } from "./context";
import { Prisma } from "@prisma/client";
import { DateTimeResolver } from "graphql-scalars";
import PrismaUtils from "@pothos/plugin-prisma-utils";
import ScopeAuthPlugin from "@pothos/plugin-scope-auth";
import PothosPrismaGeneratorPlugin from "pothos-prisma-generator";

/**
 * Create a new schema builder instance
 */
export const builder = new SchemaBuilder<{
  Context: Context;
  // PrismaTypes: PrismaTypes; //Not used because it is generated automatically
}>({
  plugins: [
    PrismaPlugin,
    PrismaUtils,
    ScopeAuthPlugin,
    PothosPrismaGeneratorPlugin,
  ],
  prisma: {
    client: prisma,
    dmmf: Prisma.dmmf,
  },
  // if necessary
  authScopes: async (context) => ({
    authenticated: !!context.user,
  }),
  pothosPrismaGenerator: {
    // Disable `autoScalers
    //autoScalers: false,

    // Replace the following directives
    // /// @pothos-generator input {data:{author:{connect:{id:"%%USER%%"}}}}
    replace: { "%%USER%%": ({ context }) => context.user?.id },

    // Set the following permissions
    /// @pothos-generator any {authority:["ROLE"]}
    authority: ({ context }) => context.user?.roles ?? [],
  },
});

How to Write Directives

/// @pothos-generator [Directive name] [Json5 format parameters]
model ModelName {
  …
}

Operation name

If no operation is specified on the directive, it is applied to all.

• query
  findUnique, findFirst, findMany, count
• find
  findUnique, findFirst,findMany
• create
  createOne, createMany
• update
  updateOne, updateMany
• delete
  deleteOne, deleteMany
• mutation
  createOne, createMany, updateOne, updateMany, deleteOne, deleteMany

Select the operation to output

operation {include:[...OperationNames],exclude[...OperationNames]}

The default is all output.

• Example1
  Include createOne and `updateOne

/// @pothos-generator operation {include:["createOne","updateOne"]}

• Example2
  Exclude deleteOne and `deleteMany

/// @pothos-generator operation {exclude:["delete"]}

Model directive

Sets options to be set for Pothos fields.

• Operator option

{
  include:[...OperationNames],
  exclude:[...OperationNames],
  option:{OptionName:Params,…}
}

• Example
  Set auth-plugin's authScopes for createOne,createMany,updateOne,updateMany,deleteOne,deleteMany.

/// @pothos-generator option {include:["mutation"],option:{authScopes:{authenticated:true}}}

Set the fields that are allowed to be entered

• Operator input-field

{
  include:[...OperationNames],
  exclude:[...OperationNames],
  fields:{include:[...FieldNames],exclude:[...FieldNames]}
}

• Example
  create allows email and name to be entered.

/// @pothos-generator input-field {include:["create"],fields:{include:["email","name"]}}

Set the data to be interrupted in prisma data

• Operator input-data

{
  include:[...OperationNames],
  exclude:[...OperationNames],
  data:InputData,
  authority:[...Authorities]
}

When authority is set, the first matching input-data directive is used.
The replace option of builder will replace the content.

• Example
  Replace authorId with %%USER%% when inserting data

/// @pothos-generator input-data {data:{authorId:"%%USER%%"}}

Interrupts where to pass to prisma; if authority is set, the first match is used

• Operator where

{
  include:[...OperationNames],
  exclude:[...OperationNames],
  where:Where,
  authority:[...Authorities]}

The replace option of builder will replace the content.

• Example
  No condition if you have USER permission, otherwise published:true will be added to the condition.

/// @pothos-generator where {include:["query"],where:{},authority:["USER"]}
/// @pothos-generator where {include:["query"],where:{published:true}}

Interrupts orderBy to pass to prisma; if authority is set, the first match is used

• Operator order

{
  include:[...OperationNames],
  exclude:[...OperationNames],
  orderBy:order,
  authority:[...Authorities]
}

• Example
  Defaults to order in ascending order of title.

/// @pothos-generator order {orderBy:{title:"asc"}}

Authority to execute operations

• Operator executable

{
  include:[...OperationNames],
  exclude:[...OperationNames],
  authority:[...Authorities]
}

• Example
  You can perform mutation only if you retain USER privileges.

/// @pothos-generator executable {include:["mutation"],authority:["USER"]}

limit on the number of events

• Operator limit

{
  include:[...OperationNames],
  exclude:[...OperationNames],
  limit:LIMIT,
  authority:[...Authorities]
}

• Example
  Set the maximum number of acquisitions to 10

/// @pothos-generator limit {limit:10}

Field directive

Field read permission

• Operator readable

[...Authorities];

If Authorities is empty, it will be removed from the GraphQL Object and will not appear in the Query.

• Example1
  It can only be retrieved if you have ADMIN permission. Otherwise, adding it to the query will raise an exception.

 /// @pothos-generator readable ["ADMIN"]

• Example2
  No one has read permission, so the field is invisible.

/// @pothos-generator readable []

Prisma schema settings

The output content is controlled by @pothos-generator.
Details are omitted since the specification is still under development and is likely to change.

The authScopes are written for the option sample, but need not be introduced if executable/readable is used.

// This is your Prisma schema file,
// learn more about it in the docs: https://pris.ly/d/prisma-schema

generator client {
  provider = "prisma-client-js"
}

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

/// @pothos-generator operation {include:["createOne","updateOne","findMany"]}
/// @pothos-generator option {include:["mutation"],option:{authScopes:{ADMIN:true}}}
/// @pothos-generator input-field {include:["create"],fields:{include:["email","name"]}}
/// @pothos-generator input-field {include:["update"],fields:{include:["name"]}}
model User {
  id        String   @id @default(uuid())
  /// @pothos-generator readable ["ADMIN"]
  email     String   @unique
  name      String   @default("User")
  posts     Post[]
  /// @pothos-generator readable ["ADMIN"]
  roles     Role[]   @default([USER])
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt
}

/// @pothos-generator operation {exclude:["deleteMany"]}
/// @pothos-generator executable {include:["mutation"],authority:["USER"]}
/// @pothos-generator input-field {fields:{exclude:["id","createdAt","updatedAt","author"]}}
/// @pothos-generator input-data {data:{authorId:"%%USER%%"}}
/// @pothos-generator where {include:["query"],where:{},authority:["USER"]}
/// @pothos-generator where {include:["query"],where:{published:true}}
/// @pothos-generator where {include:["update","delete"],where:{authorId:"%%USER%%"}}
/// @pothos-generator order {orderBy:{title:"asc"}}
model Post {
  id          String     @id @default(uuid())
  published   Boolean    @default(false)
  title       String     @default("New Post")
  content     String     @default("")
  author      User?      @relation(fields: [authorId], references: [id])
  authorId    String?
  categories  Category[]
  /// @pothos-generator readable []
  createdAt   DateTime   @default(now())
  updatedAt   DateTime   @updatedAt
  publishedAt DateTime   @default(now())
}

/// @pothos-generator order {orderBy:{name:"asc"}}
/// @pothos-generator input-field {fields:{exclude:["id","createdAt","updatedAt","posts"]}}
model Category {
  id        String   @id @default(uuid())
  name      String
  posts     Post[]
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt
}

enum Role {
  ADMIN
  USER
}

Substitution of Input Data

If a replacement string is set for builder, it will replace the strings in the input-data and where directives when the query is executed.
This can be used, for example, to write logged-in user information.

// Replace the following directives
// /// @pothos-generator input {data:{author:{connect:{id:"%%USER%%"}}}}
replace: { "%%USER%%": async ({ context }) => context.user?.id },

Switching query conditions by permissions

You can switch where by setting permissions.
In the following case, the condition where:{} is added if you are logged in, and ,where:{published:true} if you are not logged in.

// Set the following permissions
// /// @pothos-generator any {authority:["ROLE"]}

// Sample assumes ["ADMIN", "USER"] is set during authentication
authority: ({ context }) => context.user?.roles ?? [],