Cheatsheet: GraphQL

type Query {
    user(id: ID!): User
}

type User {
    id: ID!
    name: String!
    age: Int
}

type Query {
    field1: String!
    field2(arg: Int!): Int
}

type Query {
    tags: [String!]!
    users(ids: [ID!]!): [User!]!
}

input CreateUserInput {
    name: String!
    email: String!
}

enum Role {
    ADMIN
    USER
    GUEST
}

interface Node {
    id: ID!
}

type User implements Node {
    id: ID!
    name: String!
}

query {
    viewer {
        id
        name
    }
}

query {
    user(id: "123") {
        name
        email
    }
}

query {
    primary: user(id: "1") { name }
    secondary: user(id: "2") { name }
}

query GetUser($id: ID!) {
    user(id: $id) {
        id
        name
    }
}

query {
    user(id: "1") {
        ...UserSummary
    }
}

fragment UserSummary on User {
    id
    name
}

query Search($term: String!) {
    search(term: $term) {
        ... on User { id name }
        ... on Repository { id name url }
    }
}

mutation CreateUser($input: CreateUserInput!) {
    createUser(input: $input) {
        user {
            id
            name
        }
    }
}

subscription OnMessageAdded($roomId: ID!) {
    messageAdded(roomId: $roomId) {
        id
        text
        createdAt
    }
}

query GetUser($withEmail: Boolean!) {
    viewer {
        name
        email @include(if: $withEmail)
    }
}

query GetUser($hideEmail: Boolean!) {
    viewer {
        name
        email @skip(if: $hideEmail)
    }
}

query ViewerProfile {
    viewer {
        login
        avatarUrl
    }
}

query {
    __schema {
        queryType {
            fields { name }
        }
    }
}

query {
    __type(name: "User") {
        name
        fields {
            name
            type { name kind }
        }
    }
}

query GetUser($id: ID = "1") {
    user(id: $id) {
        name
    }
}

query GetPosts($first: Int!, $after: String) {
    posts(first: $first, after: $after) {
        edges {
            cursor
            node { id title }
        }
        pageInfo {
            hasNextPage
            endCursor
        }
    }
}

{
    "data": { "user": { "id": "1", "email": null } },
    "errors": [
        { "message": "Not authorized to view email", "path": ["user", "email"] }
    ]
}

type Query {
    tags: [String!]!   # list and every item are guaranteed non-null
}