Add the validationSchema option to the forFeature

[nestjs]

Add the validationSchema option to the forFeature

[kasir-barati]

@vipcxj I think this is what @kamilmysliwiec mean by validating configs in the factory:

// ./path/to/anywhere/name.config.ts
import Joi from 'joi';

export default registerAs('database', () => {
  const configs = {
    host: process.env.DATABASE_HOST,
    port: process.env.DATABASE_PORT || 5432
  }
  const schema = Joi.object({
    host: Joi.string().required(),
    port: Joi.number()
  });
  schema.validate(configs);
  // sample return val -> { value: {}, error: '"host" is required' }

[kasir-barati]

A quick note: I do not use joi, I used class-validator instead.
@RRGT19 please check my repo here: https://github.com/kasir-barati/you-say

For sake of simplicity I can break it here for you:

• I have a factory for logger envs in here: https://github.com/kasir-barati/you-say/blob/main/src/packages/logger/logger.config.ts
• And I have the class-validator here: https://github.com/kasir-barati/you-say/blob/main/src/packages/logger/validators/env.validator.ts

hopefully this will help you

[RRGT19]

For those who are looking at how to accomplish this using Joi or with a custom validate function, I have created an article on dev.to showing all the ways that I can think of.

Ways to validate environment configuration in a forFeature Config in NestJs

I hope it's helpful.

[kamilmysliwiec]

This is not how it's supposed to work. The validationSchema is used to validate the env variables, either predefined system vars or these loaded from the .env file. The forFeature() allows registering partial configurations which can include a custom validation mechanism (and defaults applied) by itself anyway.

[vipcxj]

This is not how it's supposed to work. The validationSchema is used to validate the env variables, either predefined system vars or these loaded from the .env file. The forFeature() allows registering partial configurations which can include a custom validation mechanism (and defaults applied) by itself anyway.

What a custom validation mechanism for partial configurations look like?
The validationSchema in root support default method, and it seems not work on partial config because we dircetly use process.env in partial configurations.

[RRGT19]

@kasir-barati Could you provide a more complete example of how to use Joi in the factory?