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

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

    Self.isEditable = async orderId => {
        let exists = await Self.app.models.Order.findOne({where: {id: orderId}, fields: ['isConfirmed']});

        if (!exists || exists.isConfirmed === 1)
            return false;

        return true;
    };
};