Designing Scalable Schemas

Eve Porcello

@eveporcello

Tahoe City, CA

 

GraphQL is a query language for your API.

{ }

{ }

Query

Response

GraphQL is a spec that describes:

A Query Language

A Schema Definition Language

Building the

Pet Library Schema

Keep In Mind:

  • What Clients Need

  • Specific, Consistent Naming

  • Custom Objects Over Scalar Values

Union Types

type Schedule {

    agenda: [AgendaItem!]!

}

union AgendaItem = StudyGroup | Workout

query {

    agenda {

        ...on Workout {

           name

           reps

       }

        ...on StudyGroup {

           name

           subject

           students

       }

  }

}

Query

Interfaces

interface ScheduleItem {

    name: String!

    start: Int

    end: Int

}

type StudyGroup implements ScheduleItem {

      name: String!

      start: Int

      end: Int

      students: Int!

}

type Workout implements ScheduleItem {

      name: Location!

      start: Int

      end: Int

      reps: Int!

}

type Query {

      agenda: [ScheduleItem!]!

}

enum PetCategory

DOG

CAT

STINGRAY

RABBIT

type Pet

id: ID!

name: String!

category: PetCategory!

        ...

HORSE

sleepAmount: Int

curious: Boolean

favoriteFood: String

floppy: Int

good: Boolean

chill: Boolean

fast: Boolean

streetsmart: Boolean

majestic: Boolean

interface Pet

type Cat implements Pet

id: ID!

name: String

...

sleepAmount: Int

curious: Boolean

id: ID!

name: String!

weight: Float

status: PetStatus

photo: Photo

dueDate: Date

inCareOf: Customer

type Dog implements Pet

id: ID!

name: String

...

good: Boolean

type Rabbit implements Pet

id: ID!

name: String

...

favoriteFood: String

floppy: Int

type Stingray 

implements Pet

id: ID!

name: String

...

chill: Boolean

fast: Boolean

type Horse 

implements Pet

id: ID!

name: String

...

streetsmart: Boolean

majestic: Boolean

type *TBDFuturePet 

implements Pet

id: ID!

name: String

...

newField: _____

newField: _____

Union Types

type Query {

    familyPets: [FamilyPets!]!

}

union FamilyPet = Cat | Dog

Query

query {
  familyPets {
    __typename
    ...on Cat {
      name
      weight
    }
    ...on Dog {
      name
      status
    }
  }
}

{ }

Query

Response

{ }

Query

Response

Gateway

{ }

Query

Response

Gateway

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Accounts

Thank You!

  • Eve Porcello
  • eve@moonhighway.com
  • www.moonhighway.com 
  • @eveporcello
  • www.graphqlworkshop.com

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