planka/server/api/helpers/create-card-membership.js

module.exports = {
  inputs: {
    card: {
      type: 'ref',
      required: true
    },
    userOrUserId: {
      type: 'ref',
      custom: value => _.isPlainObject(value) || _.isString(value),
      required: true
    },
    request: {
      type: 'ref'
    }
  },

  fn: async function(inputs, exits) {
    const { userId = inputs.userOrUserId } = inputs.userOrUserId;

    const cardMembership = await CardMembership.create({
      userId,
      cardId: inputs.card.id
    })
      .intercept('E_UNIQUE', 'conflict')
      .fetch();

    sails.sockets.broadcast(
      `board:${inputs.card.boardId}`,
      'cardMembershipCreate',
      {
        item: cardMembership
      },
      inputs.request
    );

    const cardSubscription = await CardSubscription.create({
      cardId: cardMembership.cardId,
      userId: cardMembership.userId,
      isPermanent: false
    })
      .tolerate('E_UNIQUE')
      .fetch();

    if (cardSubscription) {
      sails.sockets.broadcast(
        `user:${cardMembership.userId}`,
        'cardUpdate',
        {
          item: {
            id: cardMembership.cardId,
            isSubscribed: true
          }
        },
        inputs.request
      );
    }

    return exits.success(cardMembership);
  }
};