Dynamic Query Using Directives
Explore how to create dynamic GraphQL queries using directives such as @include and @skip. Understand how to use variables to conditionally load fields, allowing flexible query structures that adapt to client needs. This lesson guides you through defining variables, applying directives to fields, and refactoring queries for improved functionality in your Node.js Apollo Server applications.
We'll cover the following...
GraphQL directive
In the last lesson, we learned how to utilize GraphQL variables to filter pizzas based on a keyword entered by the user. Imagine now that our application has grown in popularity. Each pizza now requires a summary and a more thorough description , which also needs additional fields of data. We need a method to dynamically modify the structure and layout of our queries.
GraphQL has a feature called directive that allows this. A directive can be appended to a field or fragment and can influence the query’s execution in any way the server chooses. The GraphQL standard contains two default directives that each GraphQL server implementation must support:
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@include(if: Boolean): We include this field ...