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Learning GraphQL.pdf

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    Preface
    Acknowledgments
    Conventions Used in This Book
    Using Code Examples
    O’Reilly Safari
    How to Contact Us
    1. Welcome to GraphQL
    What Is GraphQL?
    The GraphQL Specification
    Design Principles of GraphQL
    Origins of GraphQL
    History of Data Transport
    Remote Procedure Call
    Simple Object Access Protocol
    REST
    REST Drawbacks
    Overfetching
    Underfetching
    Managing REST Endpoints
    GraphQL in the Real World
    GraphQL Clients
    2. Graph Theory
    Graph Theory Vocabulary
    History of Graph Theory
    Trees are Graphs
    Graphs in the Real World
    3. The GraphQL Query Language
    GraphQL API Tools
    GraphiQL
    GraphQL Playground
    Public GraphQL APIs
    The GraphQL Query
    Edges and Connections
    Fragments
    Mutations
    Using Query Variables
    Subscriptions
    Introspection
    Abstract Syntax Trees
    4. Designing a Schema
    Defining Types
    Types
    Scalar Types
    Enums
    Connections and Lists
    One-to-One Connections
    One-to-Many Connections
    Many-to-Many Connections
    Lists of Different Types
    Arguments
    Filtering Data
    Mutations
    Input Types
    Return Types
    Subscriptions
    Schema Documentation
    5. Creating a GraphQL API
    Project Setup
    Resolvers
    Root Resolvers
    Type Resolvers
    Using Inputs and Enums
    Edges and Connections
    Custom Scalars
    apollo-server-express
    Context
    Installing Mongo
    Adding Database to Context
    GitHub Authorization
    Setting Up GitHub OAuth
    The Authorization Process
    githubAuth Mutation
    Authenticating Users
    Conclusion
    6. GraphQL Clients
    Using a GraphQL API
    fetch Requests
    graphql-request
    Apollo Client
    Apollo Client with React
    Project Setup
    Configure Apollo Client
    The Query Component
    The Mutation Component
    Authorization
    Authorizing the User
    Identifying the User
    Working with the Cache
    Fetch Policies
    Persisting The Cache
    Updating the Cache
    7. GraphQL in the Real World
    Subscriptions
    Working with Subscriptions
    Consuming Subscriptions
    Uploading Files
    Handling Uploads on the Server
    Posting a New Photo with Apollo Client
    Security
    Request Timeouts
    Data Limitations
    Limiting Query Depth
    Limiting Query Complexity
    Apollo Engine
    Taking the Next Steps
    Incremental Migration
    Schema-First Development
    GraphQL Events
    Community
    Community Slack Channels
    Index
    Learning GraphQL Declarative Data Fetching for Modern Web Apps Eve Porcello and Alex Banks
    Learning GraphQL by Eve Porcello and Alex Banks Copyright © 2018 Eve Porcello and Alex Banks. All rights reserved. Printed in the United States of America. Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472. O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (http://oreilly.com/safari). For more information, contact our corporate/institutional sales department: 800- 998-9938 or corporate@oreilly.com. Acquisitions Editor: Mary Treseler Development Editor: Alicia Young Production Editor: Justin Billing Copyeditor: Chris Edwards Proofreader: Octal Publishing, Inc. Indexer: WordCo, Inc. Interior Designer: David Futato Cover Designer: Karen Montgomery Illustrator: Melanie Yarbrough August 2018: First Edition
    Revision History for the First Edition 2018-08-08: First Release See http://oreilly.com/catalog/errata.csp?isbn=9781492030713 for release details. The O’Reilly logo is a registered trademark of O’Reilly Media, Inc. Learning GraphQL, the cover image, and related trade dress are trademarks of O’Reilly Media, Inc. The views expressed in this work are those of the authors, and do not represent the publisher’s views. While the publisher and the authors have used good faith efforts to ensure that the information and instructions contained in this work are accurate, the publisher and the authors disclaim all responsibility for errors or omissions, including without limitation responsibility for damages resulting from the use of or reliance on this work. Use of the information and instructions contained in this work is at your own risk. If any code samples or other technology this work contains or describes is subject to open source licenses or the intellectual property rights of others, it is your responsibility to ensure that your use thereof complies with such licenses and/or rights. 978-1-492-03071-3 [LSI]
    Preface
    Acknowledgments This book would not be a book without the help of many phenomenal people. It started with the idea from Ally MacDonald, our editor for Learning React, who encouraged us to write Learning GraphQL. We were then very lucky to get to work with Alicia Young, who shepherded the book to its printing. Thanks to Justin Billing, Melanie Yarbrough, and Chris Edwards who sanded off all of the rough edges during an extremely thorough production edit. Throughout the process, we were fortunate to get feedback from Peggy Rayzis and Sashko Stubailo from the Apollo team who shared their insights and hot tips about the latest features. Thanks also to Adam Rackis, Garrett McCullough, and Shivi Singh, who were excellent technical editors. We wrote this book about GraphQL because we love GraphQL. We think you will too.
    Conventions Used in This Book The following typographical conventions are used in this book: Italic Indicates new terms, URLs, email addresses, filenames, and file extensions. Constant width Used for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords. Constant width bold Shows commands or other text that should be typed literally by the user. Constant width italic Shows text that should be replaced with user-supplied values or by values determined by context. This element signifies a tip or suggestion. TIP NOTE This element signifies a general note. This element indicates a warning or caution. WARNING
    Using Code Examples Supplemental material (code examples, exercises, etc.) is available for download at https://github.com/moonhighway/learning-graphql/. This book is here to help you get your job done. In general, if example code is offered with this book, you may use it in your programs and documentation. You do not need to contact us for permission unless you’re reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD- ROM of examples from O’Reilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your product’s documentation does require permission. We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: “Learning GraphQL by Eve Porcello and Alex Banks (O’Reilly). Copyright 2018 Eve Porcello and Alex Banks, 978-1-492-03071-3.” If you feel your use of code examples falls outside fair use or the permission given above, feel free to contact us at permissions@oreilly.com.
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