graphql-composition 0.12.2

An implementation of GraphQL federated schema composition
Documentation 
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---
source: crates/graphql-composition/tests/composition_tests.rs
expression: Federated SDL
input_file: crates/graphql-composition/tests/composition/entity_composite_key_basic/test.md
---
schema
  @link(url: "https://specs.apollo.dev/link/v1.0")
  @link(url: "https://specs.apollo.dev/join/v0.3", for: EXECUTION)
  @link(url: "https://specs.apollo.dev/inaccessible/v0.2", for: SECURITY)
{
  query: Query
}

directive @join__unionMember(graph: join__Graph!, member: String!) on UNION

directive @join__implements(graph: join__Graph!, interface: String!) on OBJECT | INTERFACE

directive @join__graph(name: String!, url: String) on ENUM_VALUE

directive @join__field(graph: join__Graph, requires: join__FieldSet, provides: join__FieldSet, type: String, external: Boolean, override: String, overrideLabel: String) on FIELD_DEFINITION | INPUT_FIELD_DEFINITION

directive @join__type(graph: join__Graph, key: join__FieldSet, extension: Boolean = false, resolvable: Boolean = true, isInterfaceObject: Boolean = false) on SCALAR | OBJECT | INTERFACE | UNION | ENUM | INPUT_OBJECT

directive @join__owner(graph: join__Graph!) on OBJECT

scalar join__FieldSet

type Course
  @join__type(graph: COURSES, key: "id")
  @join__type(graph: STUDENTS, key: "id")
{
  description: String @join__field(graph: COURSES)
  enrolledStudents: [Student] @join__field(graph: STUDENTS, requires: "id")
  id: ID!
  name: String @join__field(graph: COURSES)
}

type Enrollment
  @join__type(graph: COURSES, key: "studentId courseId")
  @join__type(graph: RATINGS, key: "studentId courseId")
  @join__type(graph: STUDENTS, key: "studentId courseId")
{
  course: Course @join__field(graph: STUDENTS)
  courseId: ID!
  enrollmentDate: String @join__field(graph: STUDENTS)
  enrollmentDetails: Enrollment @join__field(graph: COURSES, requires: "studentId courseId")
  rating: CourseRating @join__field(graph: RATINGS)
  studentId: ID!
}

type CourseRating
  @join__type(graph: RATINGS, key: "courseId")
{
  comments: String
  courseId: ID!
  rating: Float
}

type Student
  @join__type(graph: STUDENTS, key: "id")
{
  enrollments: [Enrollment]
  id: ID!
  name: String
}

type Query
{
  course(id: ID!): Course @join__field(graph: COURSES)
  courseRating(courseId: ID!): [CourseRating] @join__field(graph: RATINGS)
  courses: [Course] @join__field(graph: COURSES)
  student(id: ID!): Student @join__field(graph: STUDENTS)
  students: [Student] @join__field(graph: STUDENTS)
}

enum join__Graph
{
  COURSES @join__graph(name: "courses", url: "http://example.com/courses")
  RATINGS @join__graph(name: "ratings", url: "http://example.com/ratings")
  STUDENTS @join__graph(name: "students", url: "http://example.com/students")
}