Prisma fixtures cli

Relying on faker.js, prisma-fixtures-cli allows you to create a ton of fixtures/fake data for use while developing or testing your project. It gives you a few essential tools to make it very easy to collect complex data with constraints in a readable and easy to edit way, so that everyone on your team can tweak the fixtures if needed.

This package has been adapted from TypeORM Fixtures CLI thanks to its author RobinCK.

Table of Contents

• Install
• Development Setup
• Example
• Creating Fixtures
  • Fixture Ranges
  • Fixture Reference
  • Fixture Lists
• Handling Relations
• Advanced Guide
  • Parameters
  • Faker Data
  • EJS templating
  • Load Processor
• Samples
• Usage

Install

NPM

npm install @getbigger-io/prisma-fixtures-cli --save-dev

Yarn

yarn add @getbigger-io/prisma-fixtures-cli --dev

Development Setup

# install dependencies
npm install

# build dist files
npm run build

Example

fixtures/Comment.yml

entity: comment
items:
  comment{1..10}:
    fullName: '{{name.firstName}} {{name.lastName}}'
    email: '{{internet.email}}'
    text: '{{lorem.paragraphs}}'
    post: '@post*'

Note: Your entity must be named the same as you call it in the prisma client e.g: client.<entityname>.create...

fixtures/Post.yml

entity: post
connectedFields: ['user'] # Use this to connect the user when creating the post
items:
  post1:
    title: '{{name.title}}'
    description: '{{lorem.paragraphs}}'
    user: '@user($current)'
  post2:
    title: '{{name.title}}'
    description: '{{lorem.paragraphs}}'
    user: '@user($current)'

fixtures/User.yml

entity: User
connectedFields: ['profile'] # Use this to connect the user when creating the post
items:
  user1:
    firstName: '{{name.firstName}}'
    lastName: '{{name.lastName}}'
    email: '{{internet.email}}'
    profile: '@profile1'
  user2:
    firstName: '{{name.firstName}}'
    lastName: '{{name.lastName}}'
    email: '{{internet.email}}'
    profile: '@profile2'

fixtures/Profile.yml

entity: profile
items:
  profile1:
    aboutMe: <%= ['about string', 'about string 2', 'about string 3'].join(", ") %>
    skype: skype-account>
    language: english
  profile2:
    aboutMe: <%= ['about string', 'about string 2', 'about string 3'].join(", ") %>
    skype: skype-account
    language: english

Creating Fixtures

The most basic functionality of this library is to turn flat yaml files into objects

entity: user
items:
  user0:
    username: bob
    fullname: Bob
    birthDate: 1980-10-10
    email: [email protected]
    favoriteNumber: 42

  user1:
    username: alice
    fullname: Alice
    birthDate: 1978-07-12
    email: [email protected]
    favoriteNumber: 27

Fixture Ranges

The first step is to let create many copies of an object for you to remove duplication from the yaml file.

You can do that by defining a range in the fixture name:

entity: user
items:
  user{1..10}:
    username: bob
    fullname: Bob
    birthDate: 1980-10-10
    email: [email protected]
    favoriteNumber: 42

Now it will collect ten users, with IDs user1 to user10. Pretty good but we only have 10 bobs with the same name, username and email, which is not so fancy yet.

Fixture Reference

You can also specify a reference to a previously created list of fixtures:

entity: post
connectedFields: ['user'] # Use this to connect the user when creating the post
items:
  post1:
    title: 'Post title'
    description: 'Post description'
    user: '@user1'

Fixture Lists

You can also specify a list of values instead of a range:

entity: post
connectedFields: ['user']
items:
  post{1..10}:
    title: 'Post title'
    description: 'Post description'
    user: '@user($current)'

In the case of a range (e.g. user{1..10}), ($current) will return 1 for user1, 2 for user2 etc.

The current iteration can be used as a string value:

entity: post
items:
  post{1..10}:
    title: 'Post($current)'
    description: 'Post description'

Post($current) will return Post1 for post1, Post2 for post2 etc.

You can mutate this output by using basic math operators:

entity: post
items:
  post{1..10}:
    title: 'Post($current*100)'
    description: 'Post description'

Post($current*100) will return Post100 for post1, Post200 for post2 etc.

Handling Relations

entity: user
items:
  user1:
    # ...

entity: group
connectedFields: ['owner', 'members']
items:
  group1:
    name: '<{names.admin}>'
    owner: '@user1'
    members:
      - '@user2'
      - '@user3'

If you want to create ten users and ten groups and have each user own one group, you can use ($current) which is replaced with the current ID of each iteration when using fixture ranges:

entity: user
items:
  user1:
    # ...

entity: group
connectedFields: ['owner', 'members']
items:
  group{1..10}:
    name: 'name'
    owner: '@user($current)'
    members:
      - '@user2'
      - '@user3'

If you would like a random user instead of a fixed one, you can define a reference with a wildcard:

entity: user
items:
  user1:
    # ...

entity: group
connectedFields: ['owner', 'members']
items:
  group{1..10}:
    name: 'name'
    owner: '@user*'
    members:
      - '@user2'
      - '@user3'

or

entity: user
items:
  user1:
    # ...

entity: group
connectedFields: ['owner', 'members']
items:
  group{1..10}:
    name: 'name'
    owner: '@user{1..2}' # @user1 or @user2
    members:
      - '@user2'
      - '@user3'

Advanced Guide

Parameters

You can set global parameters that will be inserted everywhere those values are used to help with readability. For example:

entity: group
connectedFields: ['owner', 'members']
parameters:
  names:
    admin: Admin
items:
  group1:
    name: '<{names.admin}>' # <--- set Admin
    owner: '@user1'
    members:
      - '@user2'
      - '@user3'

Faker Data

This library integrates with the faker.js library. Using {{foo}} you can call Faker data providers to collect random data.

Let's turn our static bob user into a randomized entry:

entity: user
items:
  user{1..10}:
    username: '{{internet.userName}}'
    fullname: '{{name.firstName}} {{name.lastName}}'
    birthDate: '{{date.past}}'
    email: '{{internet.email}}'
    favoriteNumber: '{{random.number}}'

EJS templating

This library integrates with the EJS

entity: Profile
items:
  profile1:
    aboutMe: <%= ['about string', 'about string 2', 'about string 3'].join(", ") %>
    skype: skype-account>
    language: english

Load Processor

Processors allow you to process objects before and/or after they are persisted. Processors must implement the: IProcessor

import { IProcessor } from '@getbigger-io/prisma-fixtures-cli';

Here is an example:

processor/UserProcessor.ts

import { IProcessor } from '@getbigger-io/prisma-fixtures-cli';
import { User } from '@prisma/client';

export default class UserProcessor implements IProcessor<User> {
  preProcess(name: string, object: any): any {
    return { ...object, firstName: 'foo' };
  }
}

fixture config fixtures/user.yml

entity: user
processor: ../processor/UserProcessor
items:
  user1:
    firstName: '{{name.firstName}}'
    lastName: '{{name.lastName}}'
    email: '{{internet.email}}'

Usage

Usage: fixtures [options] <path> Fixtures folder/file path

Options:
  -v, --version              output the version number
  --require                  A list of additional modules. e.g. ts-node/register
  -d --debug                 Enable debug
  --databaseUrl              Overrides the DATABASE_URL env variable
  -h, --help                 output usage information
  --no-color                 Disable color

Require multiple additional modules

If you're using multiple modules at once (e.g. ts-node and tsconfig-paths) you have the ability to require these modules with multiple require flags. For example:

fixtures ./fixtures --require=ts-node/register --require=tsconfig-paths/register --databaseUrl=file:./mydb.sqlite

Programmatically loading fixtures

Although @getbigger-io/prisma-fixtures-cli is intended to use as a CLI, you can still load fixtures via APIs in your program.

For example, the below code snippet will load all fixtures exist in ./fixtures directory:

import * as path from 'path';
import { Builder, fixturesIterator, Loader, Parser, Resolver } from '@getbigger-io/prisma-fixtures-cli';

const loadFixtures = async (fixturesPath: string) => {
  let connection;

  try {
    connection = await PrismaClient();
    await connection.$connect();

    const loader = new Loader();
    loader.load(path.resolve(fixturesPath));

    const resolver = new Resolver();
    const fixtures = resolver.resolve(loader.fixtureConfigs);
    const builder = new Builder(connection, new Parser());

    for (const fixture of fixturesIterator(fixtures)) {
      const entity = await builder.build(fixture);
      // use the entity if you need it
    }
  } catch (err) {
    throw err;
  } finally {
    if (connection) {
      await connection.$disconnect();
    }
  }
};

loadFixtures('./fixtures')
  .then(() => {
    console.log('Fixtures are successfully loaded.');
  })
  .catch(err => console.log(err));

Samples

• prisma-fixtures-sample

Contributors

Code Contributors

This project exists thanks to all the people who contribute. [Contribute].

MIT © Nicolas MACHEREY