getProduct

Fetches a single product by its _id, with the full depth-2 projection available (parent, tags). Open to every authenticated role. This is the detail view behind a product listing.

note

Import alias The code below imports the framework as lesan — that's the path alias this repo's app uses (see Project Layout). In your own project, import from @hemedani/lesan (npm/Bun) or jsr:@hemedani/lesan (Deno) instead.

Registration (mod.ts)

import { grantAccess, setTokens, setUser } from "@lib";
import { coreApp } from "../../../mod.ts";
import { getProductFn } from "./getProduct.fn.ts";
import { getProductValidator } from "./getProduct.val.ts";

export const getProductSetup = () =>
  coreApp.acts.setAct({
    schema: "product",
    actName: "getProduct",
    preAct: [setTokens, setUser, grantAccess([{ roles: ["Manager", "Admin", "OrgHead", "UnitHead", "Employee", "Ordinary"] }])],
    validator: getProductValidator(),
    fn: getProductFn,
  });

The validator (getProduct.val.ts)

import { object, objectIdValidation } from "lesan";
import { selectStruct } from "../../../mod.ts";
import { activeRoleMixin } from "@lib";

export const getProductValidator = () => {
  return object({
    set: object({
      ...activeRoleMixin,
      _id: objectIdValidation,
    }),
    get: selectStruct("product", 2),
  });
};

• set is activeRoleId + _id.
• get is depth 2, so you can project parent (itself a product) and the tags array (each a tag snapshot).

The implementation (getProduct.fn.ts)

import { type ActFn, ObjectId } from "lesan";
import { product } from "../../../mod.ts";
import { throwError } from "@lib";

export const getProductFn: ActFn = async (body) => {
  const {
    set: { _id },
    get,
  } = body.details;

  const foundedProduct = await product.findOne({
    filters: { _id: new ObjectId(_id as string) },
    projection: get,
  });

  !foundedProduct && throwError("product not found");
  return foundedProduct;
};

1. The string _id is converted with new ObjectId(_id).
2. product.findOne returns the doc shaped by the client's get projection. Because relations are embedded snapshots, parent and tags come back directly — no additional queries.
3. !foundedProduct && throwError("product not found") turns a miss into an error.

In the workflow

The single-item view used when a purchase order or inventory entry references a product. Pair it with getProducts for lists, and updateProductRelations for adjusting its relations.

• product model
• Sibling acts: addProduct, getProducts, removeProduct, updateProductRelations

Run it

curl http://localhost:1380/lesan \
  -H "Content-Type: application/json" \
  -H "token: <jwt>" \
  -d '{
    "model": "product",
    "act": "getProduct",
    "details": {
      "set": { "activeRoleId": "ghost-role", "_id": "<productId>" },
      "get": { "_id": 1, "name": 1, "price": 1, "parent": { "_id": 1, "name": 1 }, "tags": { "_id": 1, "name": 1 } }
    }
  }'

Errors & fixes

Error	Meaning	Fix
product not found	No product has that _id.	Check the id — get it from getProducts.
activeRoleId is required	No activeRoleId in set.	Add it (ghost: any string, e.g. "ghost-role").
Active role not found	activeRoleId isn't one of the user's roles.	Pass a real roleId.
You cant do this	Active role not in the allowed list.	Use an allowed role or the ghost.
Invalid or expired token / you should send your id with token key in req header	Auth header problem.	Send token: <jwt>; re-login if expired.
superstruct "expected ObjectId-like string"	_id isn't a valid ObjectId.	Send the 24-hex id string.