What is the best way to incorporate a conditional filter parameter in a GraphQL query?

I am currently working with a GraphQL query using Apollo Client JS that looks like this:

query GetUsers($searchFilter: String) {
    users(
        first: 10,
        filter: { search: $searchFilter }
    ) {
        nodes {
            id
            name
        }
    }
}

Everything functions as expected when I provide the $searchFilter argument. However, I would like to make this argument optional. In other words, if it is null, the filter should not be applied.

While this may seem straightforward, the API mandates that the search field be non-nullable. Therefore, passing in filter: { search: null } is not permissible.

My goal is to achieve the following modification:

query GetUsers($searchFilter: String) {
    users(
        first: 10,
        filter: $searchFilter = null ? null : { search: $searchFilter }
    ) {
        nodes {
            id
            name
        }
    }
}

How can I conditionally add the filter argument?

Answer №1

To set the value for the filter variable in the query, simply pass the previously composed or prepared value. If you leave this variable undefined, it becomes optional.

query GetUsers($filter: SomeFilterInputType) {
  users(
    first: 10, 
    filter: $filter ) {

Include the value for filter in the [query] variables like so:

{
  filter: { search: 'sth'}
}

... where SomeFilterInputType refers to a type name used as an argument in the users query. This information can be found in the API specifications, graphiql/playground documentation, or server code/type definitions.

You can test this in graphiql/playground by using QUERY VARIABLES.

The variables sent from JavaScript should be an object with the same structure, easily adaptable based on conditions.

In this scenario, the presence of SomeFilterInputType (without a ! indicating a required field) implies that the filter variable can be null/undefined - typically, optional arguments are nullable and not mandatory. If an argument is compulsory as per the API/Backend specifications, it must also be obligatory on the client side.

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