Let's Build A Graph
Joe Fleming
- Software Engineer @ Sibi
- WebDev for over a decade
- Using GraphQL for ~3 months
@w33ble
Overview
- What is GraphQL?
- Cover Schema Definition Language (SDL)
- Build a GraphQL Server with Apollo
- Resolvers and Field Resolvers
Not Covered
- "Advanced" GraphQL Concepts
- Scalars
- Directives
- Authentication or Authorization
- Caching & DDoS Prevention
- Relay
- TypeScript types generation
Graph, noun
The collection of all points whose coordinates satisfy a given relation (such as a function)
GraphQL
An open-source data query and manipulation language for APIs, and a runtime for fulfilling queries with existing data
https://www.merriam-webster.com/dictionary/graph
export default function talk() {
return {
title: "Let's Build a Graph",
presenters: [{
name: "Joe Fleming",
alias: "w33ble"
}],
};
}
type Talk {
title: String!
presenters: [Presenter]!
}
type Presenter {
name: String!
alias: String
}
type Query {
talk: Talk!
}export default function talk() {
return {
title: "Let's Build a Graph",
presenters: [{
name: "Joe Fleming",
alias: "w33ble"
}],
};
}
export default {
Query: {
talk() {
return {
title: "Let's Build a Graph",
presenters: [{
name: "Joe Fleming",
alias: "w33ble"
}],
};
}
},
};
Mutations
Used to add, update, and delete data from your API. Equivalent to a PUT, POST, and DELETE requests in REST.
Queries
Reading data from your GraphQL API. Equivalent to a GET request in REST, used for reading data.
Always uses POST
It doesn't matter if you are querying or mutating data, all requests are POST requests
Your entire graph is accessible through a single endpoint, usually /graphql
Single Endpoint
{
talk {
title
presenters {
name
alias
}
}
}$ curl -XPOST \
--url http://localhost:4000/graphql \
-d '{"query":"{ talk { title, presenters { name, alias } } }"}'
Resources
-
A Beginner's Guide to GraphQL
- Learn how GraphQL works, and how to create an API using GraphQL
-
Graphpack
- Lets you create GraphQL servers with zero configuration
-
Hasura
- Connects to your databases & microservices and gives you a production-ready GraphQL API
-
ToDo App + Hasura
- Build a ToDo app with Hasura
Resources
-
Let's Build a Graph
- These slides (wow, so meta!)
Let's Build a Graph
By Joe Fleming
