salix/loopback/server/boot/role-resolver.js

module.exports = async function(app) {
    const models = app.models;

    models.VnRole.registerResolver('$subordinate', async(role, ctx) => {
        if (!ctx.accessToken) return false;
        const httpCtx = {req: {accessToken: {userId: ctx.accessToken.userId}}};
        return models.Worker.isSubordinate(httpCtx, +ctx.modelId);
    });
};