Gradle plugin configuration

Apollo Kotlin's default configuration works for the majority of use cases. If you're getting started, see the getting started guide for an overview of the default Gradle configuration.

This article describes configuration options for advanced use cases when using Gradle.

Using multiple GraphQL APIs

Apollo Kotlin supports communicating with multiple GraphQL endpoints with different schemas. To do so, create multiple services like so:

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apollo {
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  service("starwars") {
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    srcDir("src/main/graphql/starwars")
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    packageName.set("com.starwars")
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  }
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  service("githunt") {
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    srcDir("src/main/graphql/githunt")
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    packageName.set("com.githunt")
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  }
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}

Specifying the schema location

Specify the location of your schema file using the schemaFile property:

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apollo {
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  schemaFile.set(file("shared/graphql/schema.graphqls"))
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}

Combining multiple schema files

Apollo Kotlin supports a collection of client directives, including @nonnull, @optional, and @typePolicy. These directives enable you to extend your server's base schema with client-specific types and fields.

If you expand your schema in a separate file, you can instruct Apollo Kotlin to construct its schema from a combination of multiple files, like so:

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apollo {
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  schemaFiles.set(setOf(file("shared/graphql/schema.graphqls"), file("shared/graphql/extra.graphqls")))
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}

Wiring generated source

By default, Apollo Kotlin adds generated source:

• to the main sourceSet for JVM projects
• to commonMain for multiplatform projects
• to all non-test variants for Android projects

You can customize this behavior with the outputDirConnection property. For example, to wire a service to the test source set of a Kotlin JVM project:

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apollo {
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  outputDirConnection {
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    connectToKotlinSourceSet("test")
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  }
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}

Downloading a schema

By default, the Gradle plugin registers a downloadApolloSchema task that you can use from the command line:

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# --schema is interpreted relative to the project's root directory (can also be an absolute path). This example
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# assumes the root project directory and an Android app in `app`
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./gradlew downloadApolloSchema \
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  --endpoint="https://your.domain/graphql/endpoint" \
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  --schema="app/src/main/graphql/com/example/schema.graphqls"

If you're doing this often or want to automate the process from CI, you can configure an introspection {} block:

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apollo {
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  service("starwars") {
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    packageName.set("com.starwars")
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    // This will create a downloadStarwarsApolloSchemaFromIntrospection task
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    introspection {
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      endpointUrl.set("https://your.domain/graphql/endpoint")
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      // The path is interpreted relative to the current project here, no need to prepend 'app'
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      schemaFile.set(file("src/main/graphql/com/example/schema.graphqls"))
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    }
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  }
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}

This will create a task named download<ServiceName>ApolloSchemaFromIntrospection (downloadServiceApolloSchemaFromIntrospection by default).

If you register your schema with Apollo Studio, use the registry block instead:

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apollo {
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  service("starwars") {
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    packageName.set("com.starwars")
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    // This will create a downloadStarwarsApolloSchemaFromRegistry task
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    registry {
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      key.set(System.getenv("APOLLO_KEY"))
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      graph.set(System.geten("APOLLO_GRAPH"))
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      // The path is interpreted relative to the current project here, no need to prepend 'app'
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      schemaFile.set(file("src/main/graphql/com/example/schema.graphqls"))
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    }
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  }
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}

This will create a task named download<ServiceName>ApolloSchemaFromRegistry (downloadServiceApolloSchemaFromRegistry by default).