salix/services/loopback/common/methods/ticket/isEditable.js

module.exports = Self => {
    Self.remoteMethod('isEditable', {
        description: 'Check if a ticket is editable',
        accessType: 'READ',
        accepts: [{
            arg: 'ticketFk',
            type: 'number',
            required: true,
            description: 'ticketFk',
            http: {source: 'path'}
        }],
        returns: {
            type: 'boolean',
            root: true
        },
        http: {
            path: `/:ticketFk/isEditable`,
            verb: 'get'
        }
    });

    Self.isEditable = async ticketFk => {
        let state = await Self.app.models.TicketState.findOne({where: {ticketFk: ticketFk}, fields: 'alertLevel'});
        let exists = await Self.app.models.Ticket.findOne({where: {id: ticketFk}, fields: 'isDeleted'});
        return (exists && state == null && exists.isDeleted == 0) || (exists.isDeleted == 0 && state.alertLevel == 0);
    };
};