Client-side code generation

Is your feature request related to a problem? Please describe. Currently, the main purpose of the plugin is to generate server-side code (POJOs and interfaces). The idea is to add support of client-side classes generation. This will allow users to build a GraphQL request.

Describe the solution you’d like Schema example:

type Mutation {
    newBike(bikeInput: BikeInput!): Bike
}

input BikeInput {
    type: BikeType!
    brand: String!
    size: String!
    price: BigDecimal
}

type Bike {
    id: ID
    type: BikeType
    brand: String
    size: String
    price: BigDecimal
    addedDateTime: DateTime
}

Generated class:

public class NewBikeMutationRequest {
    private BikeInput bikeInput;
    //getters/setters
}

public class BikeInputTO {
    private BikeTypeTO type;
    private String brand;
    private String size;
    private String price;

    public BikeInputTO() { }

    //getters/setters

The end-user will then use these classes to build the request and response projection (open question for now). So that it will be serialized to the following request string:

mutation newBike {
  newBike(bike: {
    type: ROAD,
    brand: "LOL",
    size: "Big",
    year: 2019,
    price: "123.45"
  }) {
    id
    addedDateTime
  }
}

[joffrey-bion]

I was not able to find a solution for client-side code generation in Java.

Yes, I was actually mentioning code generators in general. The one I heard about was for Swift I think.

The idea of this feature would be:

1. Define the projection of the response object (which fields to fetch)
2. Properly serialize the request.

Oh OK, so you want to build client queries in Java directly? That could be a way too, I just felt like the idea of this library was to go schema-first, so I expected a query-first solution here. But that implies parsing queries. I don’t know if the library you’re using can do this.

[kobylynskyi]

@JustinBlandford This feature is available in plugin version 1.6.0.

• Sample plugin configuration: https://github.com/kobylynskyi/graphql-java-codegen/blob/master/plugins/maven/example-client/pom.xml
• Sample GraphQL request using generated classes: https://github.com/kobylynskyi/graphql-java-codegen/blob/master/plugins/maven/example-client/src/main/java/io/github/kobylynskyi/order/external/ProductServiceGraphQLClient.java#L37

Please feel free to open an issue in this project or feature request if you have any suggestions/ideas. Thanks!