Validate child against parent.

Hi,

I’m having a hard time figuring this out, not sure if it’s even supported but I feel like it should be.

Basically I’m trying to mark a field as required if a referenced field is truthy. Something along the lines of

{
  requiredField: boolean(),
  nested: object().shape({
    conditional: when('$parent.requiredField', ....)
  })
}

Something similar was being discussed over at https://github.com/jaredpalmer/formik/issues/539 but that convo didn’t get very far.

Is there no way to reference a key in a parent schema?

[jaclynj]

We had a similar issue, but solved it this way:

{
  requiredField: boolean(),
  nested: object().when('requiredField', {
    is: true,
    then: object({
      foo: string.required(),
      // ...etc
    })
}

[third774]

I ended up passing in the entire object that I’m trying to validate as context so I could grab the values I care about.

const mySchema = {
  requiredField: boolean(),
  nested: object().shape({
    conditional: string().when("$requiredField", (requiredField, schema) =>
      requiredField ? schema.required() : schema
    )
  })
}

const myObj = {
  requiredField: true,
  nested: {
    conditional: "Some string"
  }
}

const isValid = mySchema.isValidSync(myObj, {context: myObj})