planka/server/api/helpers/board-memberships/create-one.js

const valuesValidator = (value) => {
  if (!_.isPlainObject(value)) {
    return false;
  }

  if (!_.isPlainObject(value.board)) {
    return false;
  }

  if (!_.isPlainObject(value.user)) {
    return false;
  }

  return true;
};

module.exports = {
  inputs: {
    values: {
      type: 'ref',
      custom: valuesValidator,
      required: true,
    },
    request: {
      type: 'ref',
    },
  },

  exits: {
    userAlreadyBoardMember: {},
  },

  async fn(inputs) {
    const { values } = inputs;

    if (values.role === BoardMembership.Roles.EDITOR) {
      delete values.canComment;
    } else if (values.role === BoardMembership.Roles.VIEWER) {
      if (_.isNil(values.canComment)) {
        values.canComment = false;
      }
    }

    const boardMembership = await BoardMembership.create({
      ...values,
      boardId: values.board.id,
      userId: values.user.id,
    })
      .intercept('E_UNIQUE', 'userAlreadyBoardMember')
      .fetch();

    sails.sockets.broadcast(
      `user:${boardMembership.userId}`,
      'boardMembershipCreate',
      {
        item: boardMembership,
      },
      inputs.request,
    );

    sails.sockets.broadcast(
      `board:${boardMembership.boardId}`,
      'boardMembershipCreate',
      {
        item: boardMembership,
      },
      inputs.request,
    );

    return boardMembership;
  },
};