useMany and REST API

Hello, I would like to add the logic to my backend to make the useMany hook work. Here is my Controller:

export const getMany: RequestHandler = async (req, res) => {
  const { ids } = req.query;
  console.log("ids", ids);
  const leagues = await crud("league").getMany(ids as string[]);
  res.json(leagues);
};

export const getMany: RequestHandler = async (req, res) => {
  const { ids } = req.query;
  console.log("ids", ids);
  const leagues = await crud("league").getMany(ids as string[]);
  res.json(leagues);
};

And here is my Mongo service:

export const database = client.db(config.MONGO_DB_NAME);
export const collection = <TCollection extends string>(name: TCollection) =>
  database.collection<DocumentFromCollection<TCollection>>(name);
export const crud = <TCollection extends string = keyof MongoCollections>(
  collectionName: TCollection
) => {
  const _collection = collection(collectionName);
  const log = logger.getChildLogger({ name: collectionName });
  return {
    collection: _collection,
    async list(opts?: {
      filter?: Filter<DocumentFromCollection<TCollection>>;
      pagination?: { start: number; end: number };
    }) {
      const cursor = _collection
        .find(opts?.filter ?? {})
        .skip(opts?.pagination?.start ?? 0)
        .limit(
          Math.min(
            opts?.pagination
              ? Math.max(opts.pagination.end - opts.pagination.start, 0)
              : MAX_DOCUMENTS,
            MAX_DOCUMENTS
          )
        );
      return {
        data: await cursor.toArray(),
        total: await _collection.countDocuments(opts?.filter ?? {}),
      };
    },
    async getMany(ids: string[]) {
      const objectIds = ids.map((id) => new ObjectId(id));
      const documents = await _collection
        .find({ _id: { $in: objectIds } } as Filter<
          DocumentFromCollection<TCollection>
        >)
        .toArray();
      return {
        data: documents,
      };
    },
  };
};

export const database = client.db(config.MONGO_DB_NAME);
export const collection = <TCollection extends string>(name: TCollection) =>
  database.collection<DocumentFromCollection<TCollection>>(name);
export const crud = <TCollection extends string = keyof MongoCollections>(
  collectionName: TCollection
) => {
  const _collection = collection(collectionName);
  const log = logger.getChildLogger({ name: collectionName });
  return {
    collection: _collection,
    async list(opts?: {
      filter?: Filter<DocumentFromCollection<TCollection>>;
      pagination?: { start: number; end: number };
    }) {
      const cursor = _collection
        .find(opts?.filter ?? {})
        .skip(opts?.pagination?.start ?? 0)
        .limit(
          Math.min(
            opts?.pagination
              ? Math.max(opts.pagination.end - opts.pagination.start, 0)
              : MAX_DOCUMENTS,
            MAX_DOCUMENTS
          )
        );
      return {
        data: await cursor.toArray(),
        total: await _collection.countDocuments(opts?.filter ?? {}),
      };
    },
    async getMany(ids: string[]) {
      const objectIds = ids.map((id) => new ObjectId(id));
      const documents = await _collection
        .find({ _id: { $in: objectIds } } as Filter<
          DocumentFromCollection<TCollection>
        >)
        .toArray();
      return {
        data: documents,
      };
    },
  };
};

Here is the useMany hook that needs to be working:

const { data: leaguesData } = useMany<League[], HttpError>({
    resource: "leagues",
    ids: ["6697d1e2da0de8fd14940360"],
});

const { data: leaguesData } = useMany<League[], HttpError>({
    resource: "leagues",
    ids: ["6697d1e2da0de8fd14940360"],
});

What is wrong with the code?

5 Replies

kapa.ai•5mo ago

Hi @Steve.l. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- To make the useMany hook work with your backend, you need to ensure that your backend is correctly handling the request and returning the expected data format. Based on the provided code, it looks like your backend logic is mostly correct, but there are a few things to check and adjust. Backend Controller Your getMany controller looks fine, but ensure that the ids are being correctly parsed and passed to the crud service. Here is your controller for reference:

export const getMany: RequestHandler = async (req, res) => {
  const { ids } = req.query;
  console.log("ids", ids);
  const leagues = await crud("league").getMany(ids as string[]);
  res.json(leagues);
};

export const getMany: RequestHandler = async (req, res) => {
  const { ids } = req.query;
  console.log("ids", ids);
  const leagues = await crud("league").getMany(ids as string[]);
  res.json(leagues);
};

Mongo Service Your Mongo service's getMany method is also correctly implemented. It converts the string IDs to ObjectId and queries the MongoDB collection. Here is the relevant part of your Mongo service:

export const crud = <TCollection extends string = keyof MongoCollections>(
  collectionName: TCollection
) => {
  const _collection = collection(collectionName);
  return {
    async getMany(ids: string[]) {
      const objectIds = ids.map((id) => new ObjectId(id));
      const documents = await _collection
        .find({ _id: { $in: objectIds } } as Filter<
          DocumentFromCollection<TCollection>
        >)
        .toArray();
      return {
        data: documents,
      };
    },
  };
};

export const crud = <TCollection extends string = keyof MongoCollections>(
  collectionName: TCollection
) => {
  const _collection = collection(collectionName);
  return {
    async getMany(ids: string[]) {
      const objectIds = ids.map((id) => new ObjectId(id));
      const documents = await _collection
        .find({ _id: { $in: objectIds } } as Filter<
          DocumentFromCollection<TCollection>
        >)
        .toArray();
      return {
        data: documents,
      };
    },
  };
};

Frontend useMany Hook Your useMany hook usage seems correct. Here is the relevant part of your frontend code:

const { data: leaguesData } = useMany<League[], HttpError>({
    resource: "leagues",
    ids: ["6697d1e2da0de8fd14940360"],
});

const { data: leaguesData } = useMany<League[], HttpError>({
    resource: "leagues",
    ids: ["6697d1e2da0de8fd14940360"],
});

Potential Issues and Fixes 1. Ensure Correct Query Parameter Parsing: Make sure that the ids query parameter is being correctly parsed as an array. If the ids are being sent as a comma-separated string, you might need to split them. 2. Check Data Format: Ensure that the data returned from your backend matches the expected format by useMany. The useMany hook expects the data to be in the format { data: [...] }. 3. Verify ObjectId Conversion: Ensure that the ObjectId conversion is correct and that the IDs being passed are valid MongoDB ObjectIds. Example Adjustments Here is an example of how you might adjust your controller to ensure the ids are correctly parsed:

export const getMany: RequestHandler = async (req, res) => {
  const { ids } = req.query;
  const idsArray = Array.isArray(ids) ? ids : ids.split(',');
  console.log("ids", idsArray);
  const leagues = await crud("league").getMany(idsArray as string[]);
  res.json(leagues);
};

export const getMany: RequestHandler = async (req, res) => {
  const { ids } = req.query;
  const idsArray = Array.isArray(ids) ? ids : ids.split(',');
  console.log("ids", idsArray);
  const leagues = await crud("league").getMany(idsArray as string[]);
  res.json(leagues);
};

Conclusion Ensure that your backend correctly parses the ids query parameter and returns the data in the expected format. Your frontend useMany hook usage seems correct, so the main focus should be on verifying the backend logic. For more information on the useMany hook, you can refer to the official documentation (https://refine.dev/docs/data/hooks/use-many/#usage). ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•5mo ago

<@195478867811500033> kapa.ai is still learning and improving, please let us know how it did by reacting below

flat-fuchsiaOP•5mo ago

can you create me a backend router @kapa.ai ?

kapa.ai•5mo ago

Let me check the knowledge base for you. One moment! :books: ---------------------- Sure! Below is an example of how you can create a backend router to handle the getMany request for your leagues resource. This example assumes you are using Express.js for your backend. Backend Router First, ensure you have Express.js installed in your project. If not, you can install it using:

npm install express

npm install express

Then, create a router file, for example, leaguesRouter.js:

const express = require('express');
const { getMany } = require('./controllers/leaguesController'); // Adjust the path as necessary

const router = express.Router();

router.get('/many', getMany);

module.exports = router;

const express = require('express');
const { getMany } = require('./controllers/leaguesController'); // Adjust the path as necessary

const router = express.Router();

router.get('/many', getMany);

module.exports = router;

Controller Here is your leaguesController.js with the getMany function:

const { crud } = require('../services/mongoService'); // Adjust the path as necessary

export const getMany = async (req, res) => {
  const { ids } = req.query;
  const idsArray = Array.isArray(ids) ? ids : ids.split(',');
  console.log("ids", idsArray);
  const leagues = await crud("league").getMany(idsArray);
  res.json(leagues);
};

const { crud } = require('../services/mongoService'); // Adjust the path as necessary

export const getMany = async (req, res) => {
  const { ids } = req.query;
  const idsArray = Array.isArray(ids) ? ids : ids.split(',');
  console.log("ids", idsArray);
  const leagues = await crud("league").getMany(idsArray);
  res.json(leagues);
};

Mongo Service Ensure your Mongo service is correctly set up. Here is the relevant part of your mongoService.js:

const { ObjectId } = require('mongodb');
const { client } = require('./mongoClient'); // Adjust the path as necessary
const config = require('./config'); // Adjust the path as necessary

const database = client.db(config.MONGO_DB_NAME);
const collection = (name) => database.collection(name);

const crud = (collectionName) => {
  const _collection = collection(collectionName);
  return {
    async getMany(ids) {
      const objectIds = ids.map((id) => new ObjectId(id));
      const documents = await _collection
        .find({ _id: { $in: objectIds } })
        .toArray();
      return {
        data: documents,
      };
    },
  };
};

module.exports = { crud };

const { ObjectId } = require('mongodb');
const { client } = require('./mongoClient'); // Adjust the path as necessary
const config = require('./config'); // Adjust the path as necessary

const database = client.db(config.MONGO_DB_NAME);
const collection = (name) => database.collection(name);

const crud = (collectionName) => {
  const _collection = collection(collectionName);
  return {
    async getMany(ids) {
      const objectIds = ids.map((id) => new ObjectId(id));
      const documents = await _collection
        .find({ _id: { $in: objectIds } })
        .toArray();
      return {
        data: documents,
      };
    },
  };
};

module.exports = { crud };

Main Server File Finally, make sure to use the router in your main server file, for example, server.js:

const express = require('express');
const leaguesRouter = require('./routes/leaguesRouter'); // Adjust the path as necessary

const app = express();
const PORT = process.env.PORT || 3000;

app.use(express.json());
app.use('/api/leagues', leaguesRouter);

app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
});

const express = require('express');
const leaguesRouter = require('./routes/leaguesRouter'); // Adjust the path as necessary

const app = express();
const PORT = process.env.PORT || 3000;

app.use(express.json());
app.use('/api/leagues', leaguesRouter);

app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
});

Summary This setup includes: - A router file (leaguesRouter.js) to handle the /api/leagues/many endpoint. - A controller file (leaguesController.js) with the getMany function. - A Mongo service file (mongoService.js) to interact with your MongoDB database. - A main server file (server.js) to set up and run your Express.js server. Make sure to adjust the paths as necessary based on your project structure. This should provide a complete backend setup to handle the useMany hook in your frontend. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•5mo ago

<@195478867811500033> kapa.ai is still learning and improving, please let us know how it did by reacting below

useMany and REST API

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