Keep Unused Data For Period

Oct 13, 2025 by pynkocean.com 93 views

Introduction

When implementing a feature that involves pulling down on a list to reset the API state and refetch new data, you may encounter issues with the skip option in the query. This option is based on whether the page is focused, and if you leave the homepage and return within the keepUnusedDataFor period, executing the same action no longer triggers the expected behavior. In this article, we will explore the possible causes of this issue and provide insights on how to resolve it.

Understanding the Issue

The issue arises when you use the skip option in the query to determine whether to refetch data or not. When you leave the homepage and return within the keepUnusedDataFor period, the skip value is not updated, and the query is not refetched. This results in the data not being updated, and the expected behavior is not triggered.

Code Analysis

Let's take a closer look at the code provided:

import {
  useIsFocused,
} from '@react-navigation/native';
import {
  useListSwiperQuery,
} from '../../store/api/queryApi';
import {api} from '../../store/api';
import {ScrollView, RefreshControl} from 'react-native';
import Carousel from '../../components/business/Carousel';
import {useDispatch} from 'react-redux';

const Home = () => {
  const isFocused = useIsFocused();
  const listSwiperQuery = useListSwiperQuery(
    {},
    {
      skip: !isFocused,
    },
  );
  const dispatch = useDispatch();
  const onRefresh = () => { dispatch(api.util.resetApiState()); }

  return (
    <ScrollView
        refreshControl={
          <RefreshControl refreshing={listSwiperQuery.isFetching} onRefresh={onRefresh} />
        }
        overScrollMode="never"
    >
         <Carousel data={listSwiperQuery?.data?.data} />
    </ScrollView>
  )
}

In this code, the useListSwiperQuery hook is used to fetch data from the API. The skip option is set to !isFocused, which means that when the page is not focused, the query is skipped. However, when you leave the homepage and return within the keepUnusedDataFor period, the skip value is not updated, and the query is not refetched.

Possible Causes

There are several possible causes of this issue:

Keep Unused Data For Period: The keepUnusedDataFor period is set to a certain value, which means that the data is not refetched within that period. When you leave the homepage and return within this period, the data is not refetched, and the expected behavior is not triggered.
Skip Option: The skip option is set to !isFocused, which means that when the page is not focused, the query is skipped. However, when you leave the homepage and return within the keepUnusedDataFor period, the skip value is not updated, and the query is not refetched.
Query Cache: The query cache is not updated when you leave the homepage and return within the keepUnusedDataFor period. This means that the query is not refetched, and the expected behavior is not triggered.

Resolving the Issue

To resolve this issue, you can try the following:

Update the Keep Unused Data For Period: Update the keepUnusedDataFor period to a shorter value, so that the data is refetched more frequently.
Update the Skip Option: Update the skip option to a value that is not dependent on the page focus, such as a boolean value that is set to true or false based on a condition.
Update the Query Cache: Update the query cache to refresh the query when the page is focused or when the user navigates to a different page.

Conclusion

The issue of the skip option not being updated when you leave the homepage and return within the keepUnusedDataFor period can be caused by several factors, including the keepUnusedDataFor period, the skip option, and the query cache. To resolve this issue, you can try updating the keepUnusedDataFor period, the skip option, or the query cache. By understanding the possible causes of this issue and taking the necessary steps to resolve it, you can ensure that your application behaves as expected and provides a seamless user experience.

Additional Information

Keep Unused Data For Period: The keepUnusedDataFor period is a setting that determines how long data is kept in the cache before it is refetched. This period can be set to a specific value, such as 1 minute, 5 minutes, or 1 hour.
Skip Option: The skip option is a setting that determines whether to skip a query or not. This option can be set to a value that is dependent on the page focus, such as !isFocused, or a boolean value that is set to true or false based on a condition.
Query Cache: The query cache is a mechanism that stores the results of a query in memory. When a query is executed, the cache is checked to see if the results are already available. If the results are available, they are returned immediately, without executing the query again.

Code Example

Here is an example of how you can update the keepUnusedDataFor period, the skip option, and the query cache:

import {
  useIsFocused,
} from '@react-navigation/native';
import {
  useListSwiperQuery,
} from '../../store/api/queryApi';
import {api} from '../../store/api';
import {ScrollView, RefreshControl} from 'react-native';
import Carousel from '../../components/business/Carousel';
import {useDispatch} from 'react-redux';

const Home = () => {
  const isFocused = useIsFocused();
  const listSwiperQuery = useListSwiperQuery(
    {},
    {
      skip: false, // Update the skip option to false
      keepUnusedDataFor: 1 * 60 * 1000, // Update the keepUnusedDataFor period to 1 minute
    },
  );
  const dispatch = useDispatch();
  const onRefresh = () => { dispatch(api.util.resetApiState()); }

  return (
    <ScrollView
        refreshControl={
          <RefreshControl refreshing={listSwiperQuery.isFetching} onRefresh={onRefresh} />
        }
        overScrollMode="never"
    >
         <Carousel data={listSwiperQuery?.data?.data} />
    </ScrollView>
  )
}

In this example, the keepUnusedDataFor period is updated to 1 minute, and the skip option is updated to false. This means that the query will be refetched every minute, and the skip option will not be used to determine whether to skip the query or not.

Introduction

In our previous article, we discussed the issue of the skip option not being updated when you leave the homepage and return within the keepUnusedDataFor period. This can cause the data not to be refetched, and the expected behavior is not triggered. In this article, we will provide a Q&A section to help you better understand the issue and how to resolve it.

Q: What is the keepUnusedDataFor period?

A: The keepUnusedDataFor period is a setting that determines how long data is kept in the cache before it is refetched. This period can be set to a specific value, such as 1 minute, 5 minutes, or 1 hour.

Q: What is the skip option?

A: The skip option is a setting that determines whether to skip a query or not. This option can be set to a value that is dependent on the page focus, such as !isFocused, or a boolean value that is set to true or false based on a condition.

Q: Why is the skip option not being updated when I leave the homepage and return within the keepUnusedDataFor period?

A: The skip option is not being updated because the keepUnusedDataFor period is set to a value that is longer than the time it takes for the page to be refocused. This means that the skip option is not being updated, and the query is not being refetched.

Q: How can I update the keepUnusedDataFor period?

A: You can update the keepUnusedDataFor period by setting it to a shorter value, such as 1 minute or 5 minutes. This will ensure that the data is refetched more frequently, and the skip option is updated accordingly.

Q: How can I update the skip option?

A: You can update the skip option by setting it to a value that is not dependent on the page focus, such as false. This will ensure that the query is always refetched, and the skip option is not used to determine whether to skip the query or not.

Q: What is the query cache?

A: The query cache is a mechanism that stores the results of a query in memory. When a query is executed, the cache is checked to see if the results are already available. If the results are available, they are returned immediately, without executing the query again.

Q: Why is the query cache not being updated when I leave the homepage and return within the keepUnusedDataFor period?

A: The query cache is not being updated because the keepUnusedDataFor period is set to a value that is longer than the time it takes for the page to be refocused. This means that the query cache is not being updated, and the query is not being refetched.

Q: How can I update the query cache?

A: You can update the query cache by setting it to refresh the query when the page is focused or when the user navigates to a different page.

Q: What are some best practices for implementing the keepUnusedDataFor period and the skip option?

A: Some best practices for implementing the keepUnusedDataFor period and the skip option include:

Setting the keepUnusedDataFor period to a shorter value, such as 1 minute or 5 minutes.
Setting the skip option to a value that is not dependent on the page focus, such as false.
Updating the query cache to refresh the query when the page is focused or when the user navigates to a different page.

Q: What are some common mistakes to avoid when implementing the keepUnusedDataFor period and the skip option?

A: Some common mistakes to avoid when implementing the keepUnusedDataFor period and the skip option include:

Setting the keepUnusedDataFor period to a value that is too long, causing the data to not be refetched.
Setting the skip option to a value that is dependent on the page focus, causing the query to not be refetched.
Not updating the query cache, causing the query to not be refetched.

Conclusion

In this Q&A article, we discussed the issue of the skip option not being updated when you leave the homepage and return within the keepUnusedDataFor period. We also provided some best practices and common mistakes to avoid when implementing the keepUnusedDataFor period and the skip option. By following these best practices and avoiding these common mistakes, you can ensure that your application behaves as expected and provides a seamless user experience.

Additional Information

Keep Unused Data For Period: The keepUnusedDataFor period is a setting that determines how long data is kept in the cache before it is refetched. This period can be set to a specific value, such as 1 minute, 5 minutes, or 1 hour.
Skip Option: The skip option is a setting that determines whether to skip a query or not. This option can be set to a value that is dependent on the page focus, such as !isFocused, or a boolean value that is set to true or false based on a condition.
Query Cache: The query cache is a mechanism that stores the results of a query in memory. When a query is executed, the cache is checked to see if the results are already available. If the results are available, they are returned immediately, without executing the query again.

Code Example

Here is an example of how you can update the keepUnusedDataFor period, the skip option, and the query cache:

import {
  useIsFocused,
} from '@react-navigation/native';
import {
  useListSwiperQuery,
} from '../../store/api/queryApi';
import {api} from '../../store/api';
import {ScrollView, RefreshControl} from 'react-native';
import Carousel from '../../components/business/Carousel';
import {useDispatch} from 'react-redux';

const Home = () => {
  const isFocused = useIsFocused();
  const listSwiperQuery = useListSwiperQuery(
    {},
    {
      skip: false, // Update the skip option to false
      keepUnusedDataFor: 1 * 60 * 1000, // Update the keepUnusedDataFor period to 1 minute
    },
  );
  const dispatch = useDispatch();
  const onRefresh = () => { dispatch(api.util.resetApiState()); }

  return (
    <ScrollView
        refreshControl={
          <RefreshControl refreshing={listSwiperQuery.isFetching} onRefresh={onRefresh} />
        }
        overScrollMode="never"
    >
         <Carousel data={listSwiperQuery?.data?.data} />
    </ScrollView>
  )
}