conditional-validator.js

import buildMessage from 'ember-changeset-validations/utils/validation-errors';
import { validate } from 'ember-validators';

export default function validatePresence(options) {
  let targets;
  if (typeof options === 'boolean') {
    options = { presence: options };
  } else if (options && options.on !== undefined) {
    if (typeof options.on === 'string') {
      targets = [options.on];
    } else if (Array.isArray(options.on)) {
      targets = options.on;
    }

    delete options.on;
  }

  return (key, value, _oldValue, changes, content) => {
    const hasTargetValues = targets.some((target) => changes[target] || (changes[target] === undefined && content[target]));
    const hasMatchingWith = options.withValue && targets.some((target) => (changes[target] || content[target]) === options.withValue);

    // if it targets are empty, this is valid because
    // it's only required (validates presence) when targets
    // are filled
    if ((targets && !hasTargetValues) || !hasMatchingWith) {
      return true;
    }

    const result = validate('presence', value, options, null, key);

    if (typeof result === 'boolean' || typeof result === 'string') {
      return result;
    }

    // We flipped the meaning behind `present` and `blank` so switch the two
    if (result.type === 'present') {
      result.type = 'blank';
    } else if (result.type === 'blank') {
      result.type = 'present';
    }

    return buildMessage(key, result);
  };
}