planka/server/api/helpers/get-subscription-user-ids-for-card.js

module.exports = {
  inputs: {
    id: {
      type: 'json',
      custom: (value) => _.isString(value) || _.isArray(value),
      required: true,
    },
    exceptUserId: {
      type: 'json',
      custom: (value) => _.isString(value) || _.isArray(value),
    },
    withCardSubscriptions: {
      type: 'boolean',
      defaultsTo: false,
    },
  },

  async fn(inputs, exits) {
    const cardSubscriptions = await sails.helpers.getSubscriptionsForCard(
      inputs.id,
      inputs.exceptUserId,
    );

    const userIds = sails.helpers.mapRecords(cardSubscriptions, 'userId', _.isArray(inputs.id));

    return exits.success(
      inputs.withCardSubscriptions
        ? {
            userIds,
            cardSubscriptions,
          }
        : userIds,
    );
  },
};