Examples
Dart GraphQL API
Building a GraphQL API
Dart GraphQL API with graphql package supports typed queries.
Introduction to Dart GraphQL
GraphQL is a powerful query language for APIs and a runtime for executing those queries with your existing data. In Dart, the graphql package provides tools to build a GraphQL client that supports typed queries, which help in writing more predictable and maintainable code.
Setting Up the GraphQL Package
To make queries using GraphQL in Dart, you first need to add the graphql package to your pubspec.yaml file. This package allows you to perform GraphQL queries and mutations in a Flutter or Dart application.
Creating a Simple GraphQL Query
Once the package is installed, you can create a simple GraphQL query to fetch data from your API. Here's an example of how to query a list of users from a GraphQL server:
Understanding Typed Queries
Typed queries in GraphQL allow developers to specify exactly what fields they need. This makes your API requests more efficient and your code more predictable. In the example above, the ReadUsers query specifies that we want the id, name, and email fields for each user.
Handling Query Results
Handling results from a GraphQL query involves checking for exceptions and then processing the data. In the example provided, if the query has an exception, it is printed to the console. Otherwise, the list of users is extracted from the result and printed.
Conclusion and Next Steps
In this example, we demonstrated how to set up a basic GraphQL client in Dart using the graphql package. This allows you to perform typed queries against a GraphQL API. In the next post, we will explore building a Real-Time Chat application that leverages GraphQL subscriptions for real-time data updates.
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