Examples
Ruby GraphQL API
Building a GraphQL API
Ruby GraphQL API with graphql-ruby supports typed queries.
Introduction to GraphQL and Ruby
GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. Unlike REST APIs, GraphQL allows clients to request only the data they need, and nothing more, which can reduce the number of requests and improve performance. In Ruby, the graphql-ruby gem makes it possible to build GraphQL APIs efficiently.
Setting Up a Ruby GraphQL API
To get started with GraphQL in Ruby, you first need to install the graphql-ruby gem. This library provides a robust framework for building GraphQL APIs in Ruby.
First, add graphql to your Gemfile:
Then, run bundle install to install the gem. After installation, you can generate necessary files by running:
Creating a GraphQL Type
In GraphQL, a Type defines the shape of your data and the operations you can perform on it. Let's create a simple PostType to represent blog posts. Create a new file in app/graphql/types/ and define your type:
Defining a Query for the API
A Query in GraphQL is responsible for fetching data from your API. Let's define a query to retrieve a list of posts. Add the following code to your app/graphql/types/query_type.rb file:
Executing a GraphQL Query
With your types and queries defined, you can now execute GraphQL queries. Open your GraphiQL interface, typically available at /graphql in your Rails application, and enter the following query to fetch posts:
This query will return a list of posts with their id, title, body, and createdAt fields. GraphQL ensures that only the requested fields are returned, providing efficient data fetching.
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