Feature Request: validatePresenceOn

[jhitchins88]

Suggested Addition

The validatePresenceOn validator: validate presence if other field(s) are also there.

How it works

export default {
  lastName: validatePresenceOn('firstName'),
  password: validatePresenceOn([ 'email', 'ssn', 'address', ])
}

Alternatively, it could be an option for the validatePresence validator:

export default {
  lastName: validatePresence({ on: 'firstName' }),
  password: validatePresence({ on: [ 'email', 'ssn', 'address', ] })
}

This is something I wrote as a custom validator, so if it's something you would like, I can put up a PR.

[snewcomer]

@jhitchins88 This seems like a phenomenal idea. Lmk if you have time for a PR!

[nickschot]

@jhitchins88 how did you write this validator? Don't the validators only receive the key and the value of the property that is validated?

I'm very interested in this (and a similar validator where at least one of several fields must be present/have a specific format).

[jhitchins88]

@snewcomer I should be able to do it. I'll work it up into a PR soon.

@nickschot I used the changes and content (4th and 5th parameters) passed into the validator function. Those let you look at the whole changeset.

[musaffa]

@nickschot a similar validator where at least one of several fields must be present/have a specific format

@jhitchins88 Can you add this feature as well?

[jhitchins88]

@musaffa

I'd need a little more description of "have a specific format", but I'd be down if we know what that looks like. If it gets too much more complicated, we should probably break this functionality into its own validator, or have some way to do conditionals in the validations file, like #116 suggests. This on option is basically just a fancy, specific conditional, that could be replaced with a general conditional for any validator in the future.

[musaffa]

@nickschot Can you please clarify this format validation of one field in another field?