Filtering in GraphQL

Filtering in GraphQL

In GraphQL, a filter is a set of conditions that are used to narrow down the results of a query. It allows you to specify criteria for selecting specific data, and can be used to filter the results of a query based on certain criteria.

Filters are often used in conjunction with the WHERE clause in a GraphQL query.

For example, the following query uses a filter to select only products that are available for sale:

query {
  products(where: { isAvailable: true }) {
    name
    price
  }
}

This query will return a list of all products that have an isAvailable value of true.

You can also use multiple filters in a single query to further narrow down the results. For example, the following query uses two filters to select only products that are available for sale and have a price less than $10:

query {
  products(where: { isAvailable: true, price_lt: 10 }) {
    name
    price
  }
}

This query will return a list of all products that have an isAvailable value of true and a price value that is less than $10.

Conclusion

Filters are a powerful way to select specific data in a GraphQL query. They allow you to specify criteria for selecting data and can help you get exactly the data you need from your GraphQL server.