Zod•17mo ago

No I should just be less lazy 🙂

No, I should just be less lazy 🙂

6 Replies

SteveOP•17mo ago

@Scott Trinh I basically want to create class instances from schema's, but not sure if it is any good to do.

Oh, I think I understand. Yeah nothing built in but you can certainly use Zod in your constructor to do a lot of what you would normally do in a constructor.

SteveOP•17mo ago

@Scott Trinh There is something built-in 🙂 .transform does it with ease

Scott Trinh•17mo ago

Hmm, maybe I'm just not understanding the question after all, but glad that works!

SteveOP•17mo ago

Yeah so I m basically building up a class instance using transform

import {z} from "zod";

class TestClass {
    constructor(
        public testProp: string
    ) {

    }

    public getTestProp(): string { return this.testProp; }
}

const TestClassZSchema = z.object({
    testProp: z.string()
}).strict().transform((dto): TestClass => new TestClass(dto.testProp))

const instance = TestClassZSchema.parse({ testProp: '123' });

console.log(instance.getTestProp());

import {z} from "zod";

class TestClass {
    constructor(
        public testProp: string
    ) {

    }

    public getTestProp(): string { return this.testProp; }
}

const TestClassZSchema = z.object({
    testProp: z.string()
}).strict().transform((dto): TestClass => new TestClass(dto.testProp))

const instance = TestClassZSchema.parse({ testProp: '123' });

console.log(instance.getTestProp());

Scott Trinh•17mo ago

Ahh, gotcha. I was thinking the other way around like:

class TestClass {
  public testProp: string;
  constructor(
    testProp: string
  ) {
    this.testProp = z.string().parse(testProp);
  }

  public getTestProp(): string {
    return this.testProp;
  }
}

const instance = new TestClass("123");

class TestClass {
  public testProp: string;
  constructor(
    testProp: string
  ) {
    this.testProp = z.string().parse(testProp);
  }

  public getTestProp(): string {
    return this.testProp;
  }
}

const instance = new TestClass("123");

Basically "hide" Zod within the constructor so the consumer doesn't need to think about the parsing, but that definitely has a different public type interface (unknown vs. string).

Gaming

Programming

No I should just be less lazy 🙂