useMany

The useMany hook expects a resource and ids property, which will be passed to the getMany method from the dataProvider as a parameter.

When these properties are changed, the useMany hook will trigger a new request.

import { useState } from "react";
import { useMany, HttpError } from "@refinedev/core";

interface IProduct {
  id: number;
  name: string;
  material: string;
}

const ProductList: React.FC = () => {
  const [ids, setIds] = useState([1, 2, 3]);

  const { data, isLoading, isError } = useMany<IProduct, HttpError>({
    resource: "products",
    ids,
  });

  const products = data?.data ?? [];

  if (isLoading) {
    return <div>Loading...</div>;
  }

  if (isError) {
    return <div>Something went wrong!</div>;
  }

  return (
    <div>
      {products.map((product) => (
        <ul key={product.id}>
          <li key={product.id}>
            {product.id} - {product.name}{" "}
            <button
              onClick={() =>
                setIds((prev) => prev.filter((id) => id !== product.id))
              }
            >
              remove
            </button>
          </li>
        </ul>
      ))}

      <button
        onClick={() => {
          setIds((prev) => [...prev, Math.floor(Math.random() * 1000) + 1]);
        }}
      >
        Add new product
      </button>
    </div>
  );
};

This feature is only available if you use a Live Provider.

When the useMany hook is mounted, it will call the subscribe method from the liveProvider with some parameters such as channel, resource etc. It is useful when you want to subscribe to live updates.

This parameter will be passed to the getMany method from the dataProvider as a parameter. t is usually used as an API endpoint path but it all depends on how you handle the resource in the getMany method.

useMany({
  resource: "categories",
});

For more information, refer to the creating a data provider tutorial →

If you have multiple resources with the same name, you can pass the identifier instead of the name of the resource. It will only be used as the main matching key for the resource, data provider methods will still work with the name of the resource defined in the <Refine/> component.

For more information, refer to the identifier of the <Refine/> component documentation →

This prop will be passed to the getMany method from the dataProvider as a parameter. It is used to determine which records to fetch.

useMany({
  ids: [1, 2, 3],
});

This prop allows you to specify which dataProvider if you have more than one. Just pass it like in the example:

useMany({
  dataProviderName: "second-data-provider",
});

queryOptions is used to pass additional options to the useQuery hook. It is useful when you want to pass additional options to the useQuery hook.

useMany({
  queryOptions: {
    retry: 3,
    enabled: false,
  },
});

For more information, refer to the useQuery documentation→

meta is a special property that can be used to pass additional information to data provider methods for the following purposes:

• Customizing the data provider methods for specific use cases.
• Generating GraphQL queries using plain JavaScript Objects (JSON).

In the following example, we pass the headers property in the meta object to the create method. With similar logic, you can pass any properties to specifically handle the data provider methods.

import { stringify } from "query-string";

useMany({
  meta: {
    headers: { "x-meta-data": "true" },
  },
});

const myDataProvider = {
  //...
  getMany: async ({
    resource,
    ids,
    meta,
  }) => {
    const headers = meta?.headers ?? {};
    const url = `${apiUrl}/${resource}?${stringify({ id: ids })}`;

    //...
    //...

    const { data } = await httpClient.get(`${url}`, { headers });

    return {
      data,
    };
  },
  //...
};

For more information, refer to the meta section of the General Concepts documentation→

NotificationProvider is required for this prop to work.

After data is fetched successfully, useMany can call open function from NotificationProvider to show a success notification. With this prop, you can customize the success notification.

useMany({
  successNotification: (data, ids, resource) => {
    return {
      message: `${data.title} Successfully fetched.`,
      description: "Success with no errors",
      type: "success",
    };
  },
});

NotificationProvider is required for this prop to work.

After data fetching is failed, useMany will call the open function from NotificationProvider to show an error notification. With this prop, you can customize the error notification.

useMany({
  errorNotification: (data, ids, resource) => {
    return {
      message: `Something went wrong when getting ${data.id}`,
      description: "Error",
      type: "error",
    };
  },
});

LiveProvider is required for this prop to work.

Determines whether to update data automatically ("auto") or not ("manual") if a related live event is received. It can be used to update and show data in Realtime throughout your app.

useMany({
  liveMode: "auto",
});

LiveProvider is required for this prop to work.

The callback function is executed when new events from a subscription have arrived.

useMany({
  onLiveEvent: (event) => {
    console.log(event);
  },
});

LiveProvider is required for this prop to work.

Params to pass to liveProvider's subscribe method.

If you want loading overtime for the request, you can pass the overtimeOptions prop to the this hook. It is useful when you want to show a loading indicator when the request takes too long. interval is the time interval in milliseconds. onInterval is the function that will be called on each interval.

Return overtime object from this hook. elapsedTime is the elapsed time in milliseconds. It becomes undefined when the request is completed.

const { overtime } = useMany({
  //...
  overtimeOptions: {
    interval: 1000,
    onInterval(elapsedInterval) {
      console.log(elapsedInterval);
    },
  },
});

console.log(overtime.elapsedTime); // undefined, 1000, 2000, 3000 4000, ...

// You can use it like this:
{
  elapsedTime >= 4000 && <div>this takes a bit longer than expected</div>;
}

Returns an object with TanStack Query's useQuery return values.

For more information, refer to the useQuery documentation →

overtime object is returned from this hook. elapsedTime is the elapsed time in milliseconds. It becomes undefined when the request is completed.

const { overtime } = useMany();

console.log(overtime.elapsedTime); // undefined, 1000, 2000, 3000 4000, ...