useList count supabase

embarrassing-maroon · 2024-09-27T11:35:05.055Z

how do i get the total count with useList supabase?

K

kapa.ai•9/27/24, 11:35 AM

Hi @d4rk51d3. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base.

K

kapa.ai•9/27/24, 11:35 AM

----------------------
To get the total count with

useList

useList

when using Supabase as your data provider, you can utilize the

meta

meta

property to pass the

count

count

parameter. By default, the

getList

getList

method returns the exact count of rows, but you can request an estimated count to improve performance.

Here's how you can do it:

Exact Count (Default): This will return the exact number of rows, but it might slow down the request depending on the table size.
Estimated Count: You can request an estimated count by passing the
```
count
```
```
count
```
property in the
```
meta
```
```
meta
```
object.

### Example Code

import { useList } from "@refinedev/core";

const PostList: React.FC = () => {
  const { data, isLoading, isError } = useList({
    resource: "posts",
    meta: {
      count: "estimated", // Use "exact" for exact count
    },
  });

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

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

  return (
    <div>
      <ul>
        {data?.data.map((post) => (
          <li key={post.id}>{post.title}</li>
        ))}
      </ul>
      <div>Total Count: {data?.total}</div>
    </div>
  );
};

import { useList } from "@refinedev/core";

const PostList: React.FC = () => {
  const { data, isLoading, isError } = useList({
    resource: "posts",
    meta: {
      count: "estimated", // Use "exact" for exact count
    },
  });

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

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

  return (
    <div>
      <ul>
        {data?.data.map((post) => (
          <li key={post.id}>{post.title}</li>
        ))}
      </ul>
      <div>Total Count: {data?.total}</div>
    </div>
  );
};

import { useList } from "@refinedev/core";

const PostList: React.FC = () => {
  const { data, isLoading, isError } = useList({
    resource: "posts",
    meta: {
      count: "estimated", // Use "exact" for exact count
    },
  });

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

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

  return (
    <div>
      <ul>
        {data?.data.map((post) => (
          <li key={post.id}>{post.title}</li>
        ))}
      </ul>
      <div>Total Count: {data?.total}</div>
    </div>
  );
};

import { useList } from "@refinedev/core";

const PostList: React.FC = () => {
  const { data, isLoading, isError } = useList({
    resource: "posts",
    meta: {
      count: "estimated", // Use "exact" for exact count
    },
  });

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

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

  return (
    <div>
      <ul>
        {data?.data.map((post) => (
          <li key={post.id}>{post.title}</li>
        ))}
      </ul>
      <div>Total Count: {data?.total}</div>
    </div>
  );
};

Explanation

meta: { count: "estimated" }
meta: { count: "estimated" }
meta: { count: "estimated" }
meta: { count: "estimated" }: This line in the
```
useList
```
```
useList
```
hook configuration requests an estimated count of the total rows. You can change
```
"estimated"
```
"estimated"
```
"estimated"
```
"estimated"
to
```
"exact"
```
"exact"
```
"exact"
```
"exact"
if you need the exact count.

For more details, you can refer to the Supabase documentation on
getList
getList
performance (https://refine.dev/docs/data/packages/supabase/#getlist---performance) and the useList hook documentation (https://refine.dev/docs/data/hooks/use-list/#retrieving-the-total-row-count).

K

kapa.ai•9/27/24, 11:35 AM

By using the

meta

meta

property, you can control how the total count is retrieved, which can help optimize performance based on your application's needs.
----------------------
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----------------------

K

kapa.ai•9/27/24, 11:35 AM

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