A
arktype•4w ago
GreggOD

dynamic validation?

I have a schema like so: 
export const blog = type({
  headline: "string > 0",
  description: "string > 0",
  "date_published?": date.or("null"),
  date_created: date,
})
export const blog = type({
  headline: "string > 0",
  description: "string > 0",
  "date_published?": date.or("null"),
  date_created: date,
})
With this schema i want to do two types of validation. One i dont care if the strings are filled in, they can be empty strings - this is for blogs that are not published. And then two i want to be able to ensure all fields are filled in when the date_published field is filled in because the blog will be published and needs all the required fields. What is the best way to adapt a schema on a prorata basis without duplicating it? Sometimes I dont mind empty strings and sometimes I want the strings to be filled in.
2 Replies
Raqueebuddin Aziz
Raqueebuddin Aziz•3w ago
https://arktype.io/docs/intro/adding-constraints Make your schema for the generic case aka remove the > 0. Then in the narrow function check if datePublished crossed and if it is return false in the narrow function if strings are empty
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TizzySaurus
TizzySaurus•3w ago
You can probably go a step further and use a discriminated union. Something like
type({
    data_published: "never | null",
    headline: "string"
}).or({
    data_published: date,
    headline: "string > 0"
})
type({
    data_published: "never | null",
    headline: "string"
}).or({
    data_published: date,
    headline: "string > 0"
})
But otherwsie yeah, a narrow would work

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