gem-hunter

✨ The fork of Zod Prisma generator for using with nestjs-zod ✨

1. About The Project
   • Built With
2. Getting Started
   • Prerequisites
   • Installation
3. Usage
   • JSDoc Generation
   • Extending Zod Fields
   • Importing Helpers
     • Custom Zod Schemas
   • JSON Fields
4. Examples
5. Roadmap
6. Contributing
7. License
8. Contact

Zod Prisma doesn't work well with nestjs-zod and its author has been inactive for a long time - so I created this fork to fix the problems that I suffered from.

To work better with nestjs-zod, this library provides a little different API for Prisma rich comments directives.

You can use @z.string().etc() for specifying different nestjs-zod/z schemas, @z&.something().etc() for applying a new methods on the schema and @z.from(imports.MyPasswordSchema) for using your own schemas.

Also, this library generates DTOs for better NestJS integration. It's done using createZodDto from nestjs-zod.

And we still support the JSDoc comments.

• dts-cli
• Zod
• Based on this gist

To get a local copy up and running follow these simple steps.

• prisma - ^3.0.0
• nestjs-zod - ^0.4.4

0. Ensure your tsconfig.json enables the compiler's strict mode. Zod requires it and so do we, you will experience TS errors without strict mode enabled

1. Add nestjs-zod-prisma as a dev dependency

   yarn add -D nestjs-zod-prisma

2. Add the nestjs-zod-prisma generator to your schema.prisma

   generator zod {
     provider                 = "nestjs-zod-prisma"
     output                   = "./src/zod" // (default) the directory where generated zod schemas will be saved
   
     relationModel            = true // (default) Create and export both plain and related models.
     // relationModel         = "default" // Do not export model without relations.
     // relationModel         = false // Do not generate related model
   
     generateDto              = true // (default) Generate DTOs for NestJS
   
     modelCase                = "PascalCase" // (default) Output models using pascal case (ex. UserModel, PostModel)
     // modelCase             = "camelCase" // Output models using camel case (ex. userModel, postModel)
   
     modelSuffix              = "Model" // (default) Suffix to apply to your prisma models when naming Zod schemas
   
     dtoCase                = "PascalCase" // (default) Output DTOs using pascal case (ex. UserDto, PostDto)
     // dtoCase             = "camelCase" // Output DTOs using camel case (ex. userDto, postDto)
   
     dtoSuffix              = "Dto" // (default) Suffix to apply to your prisma models when naming DTOs
   
     // useDecimalJs          = false // (default) represent the prisma Decimal type using as a JS number
     useDecimalJs             = true // represent the prisma Decimal type using Decimal.js (as Prisma does)
   
     imports                  = null // (default) will import the referenced file in generated schemas to be used via imports.someExportedVariable
   
     // https://www.prisma.io/docs/concepts/components/prisma-client/working-with-fields/working-with-json-fields#filtering-by-null-values
     prismaJsonNullability    = true // (default) uses prisma's scheme for JSON field nullability
     // prismaJsonNullability = false // allows null assignment to optional JSON fields
   }

3. Run npx prisma generate or yarn prisma generate to generate your zod schemas

4. Import the generated schemas form your selected output location

Rich-comments in the Prisma schema will be transformed into JSDoc for the associated fields:

Note: make sure to use a triple-slash. Double-slash comments won't be processed.

model Post {
  /// The unique identifier for the post
  /// @default {Generated by database}
  id String @id @default(uuid())

  /// A brief title that describes the contents of the post
  title String

  /// The actual contents of the post.
  contents String
}

Generated code:

export const PostModel = z.object({
  /**
   * The unique identifier for the post
   * @default {Generated by database}
   */
  id: z.string().uuid(),
  /**
   * A brief title that describes the contents of the post
   */
  title: z.string(),
  /**
   * The actual contents of the post.
   */
  contents: z.string(),
})

You can also use the @z keyword in rich-comments in the Prisma schema to specify your Zod schema:

model User {
  id String @id @default(uuid()) /// @z.string().uuid()

  /// @z.string().min(8).max(20)
  username String

  /// @z.password().atLeastOne('digit').atLeastOne('lowercase').atLeastOne('uppercase').min(8).max(100)
  password String
}

Generated code:

export const UserModel = z.object({
  id: z.string().uuid(),
  username: z.string().min(8).max(20),
  password: z
    .password()
    .atLeastOne('digit')
    .atLeastOne('lowercase')
    .atLeastOne('uppercase')
    .min(8)
    .max(100),
})

Sometimes its useful to define a custom Zod preprocessor or transformer for your data. nestjs-zod-prisma enables you to reuse these by importing them via a config options. For example:

generator zod {
  provider      = "nestjs-zod-prisma"
  output        = "./src/zod"
  imports       = "../zod-schemas"
}

model User {
  username  String /// @z.string().refine(imports.isValidUsername)
}

The referenced file can then be used by simply referring to exported members via imports.whateverExport. The generated zod schema files will now include a namespaced import like the following.

import * as imports from '../../src/zod-schemas'

Use combination of z.from and imports to apply your custom Zod schema:

model User {
  id String @id @default(uuid())
  username String

  /// @z.from(imports.MyPasswordSchema)
  password String
}

JSON fields in Prisma disallow null values. This is to disambiguate between setting a field's value to NULL in the database and having a value of null stored in the JSON. In accordance with this nestjs-zod-prisma will default to disallowing null values, even if your JSON field is optional.

If you would like to revert this behavior and allow null assignment to JSON fields, you can set prismaJsonNullability to false in the generator options.

For examples, please refer to the Examples Directory or the Functional Tests

See the open issues for a list of proposed features (and known issues).

Contributions are what make the open source community such an amazing place to be learn, inspire, and create. Any contributions you make are greatly appreciated.

1. Fork the Project
2. Create your Feature Branch (git checkout -b feature/AmazingFeature)
3. Commit your Changes (git commit -m 'Add some AmazingFeature')
4. Push to the Branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

Distributed under the MIT License. See LICENSE for more information.

Evgeny Zakharov - risenforces@gmail.com

Project Link: https://github.com/risenforces/nestjs-zod-prisma