salix/back/methods/dms/removeFile.js

const UserError = require('vn-loopback/util/user-error');

module.exports = Self => {
    Self.remoteMethodCtx('removeFile', {
        description: 'Makes a logical delete moving a file to a trash folder',
        accessType: 'WRITE',
        accepts: [{
            arg: 'id',
            type: 'Number',
            description: 'The document id',
            http: {source: 'path'}
        }],
        returns: {
            type: 'Object',
            root: true
        },
        http: {
            path: `/:id/removeFile`,
            verb: 'POST'
        }
    });

    Self.removeFile = async(ctx, id) => {
        const models = Self.app.models;
        const trashDmsType = await models.DmsType.findOne({where: {code: 'trash'}});
        const dms = await models.Dms.findById(id);

        const hasWriteRole = await models.DmsType.hasWriteRole(ctx, dms.dmsTypeFk);
        if (!hasWriteRole)
            throw new UserError(`You don't have enough privileges`);

        return dms.updateAttribute('dmsTypeFk', trashDmsType.id);
    };
};