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Efficient Data Fetching with GraphQL and Relay Dan Schafer Facebook Product Infrastructure @dlschafer

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Flux

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Flux Dispatcher Action Store View Action

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Flux Dispatcher Action Store View Action Server

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Flux Dispatcher Action Store View Action Server

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Server

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Server

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Server

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Server

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Server

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Server

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Server

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Server

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Server

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Server

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Server

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Server

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Server

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Server

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Server

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Response Shape

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Composition

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Composition

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Composition

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Composition

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{ id: 3500401,

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{ id: 3500401, name: "Jing Chen",

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{ id: 3500401, name: "Jing Chen", isViewerFriend: true,

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{ id: 3500401, name: "Jing Chen", isViewerFriend: true, mutualFriends: { count: 195 },

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{ id: 3500401, name: "Jing Chen", isViewerFriend: true, mutualFriends: { count: 195 }, profilePicture: { uri: "http://…", width: 50, height: 50 } }

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{ id: 3500401, name: "Jing Chen", isViewerFriend: true, mutualFriends: { count: 195 }, profilePicture: { uri: "http://…", width: 50, height: 50 } }

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{ id name isViewerFriend mutualFriends { count } profilePicture { uri width height } }

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{ id name isViewerFriend mutualFriends { count } profilePicture { uri width height } }

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GraphQL

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GraphQL { { "id": "1572451031", "name": "Daniel Schafer" } }

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GraphQL { { "id": "1572451031", "name": "Daniel Schafer" } } { id name }

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GraphQL { "node": { "id": "1572451031", "name": "Daniel Schafer" } } { node(id: 1572451031) { id name } }

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GraphQL { "node": { "id": "1572451031", "name": "Daniel Schafer" } } { node(id: 1572451031) { id name birthdate { month day } } }

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GraphQL { "node": { "id": "1572451031", "name": "Daniel Schafer", "birthdate": { "month": 1, "day": 17, } } } { node(id: 1572451031) { id name birthdate { month day } } }

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GraphQL + React

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GraphQL + React

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var FriendInfo = React.createClass({ render: function() { return (
{this.props.user.name} {this.props.user.mutualFriends.count} mutual friends
); } }); GraphQL + React

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var FriendInfo = React.createClass({ statics: { queries: { } } render: function() { return (
{this.props.user.name} {this.props.user.mutualFriends.count} mutual friends
); } }); GraphQL + React

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var FriendInfo = React.createClass({ statics: { queries: { user: function() { return graphql` User { name mutualFriends { count } } `; } } }, render: function() { return (
{this.props.user.name} {this.props.user.mutualFriends.count} mutual friends
); } }); GraphQL + React

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var FriendInfo = React.createClass({ statics: { queries: { user: function() { return graphql` User { name mutualFriends { count } } `; } } }, render: function() { return (
{this.props.user.name} {this.props.user.mutualFriends.count} mutual friends
); } }); GraphQL + React

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var FriendInfo = React.createClass({ statics: { queries: { user: function() { return graphql` User { name mutualFriends { count } } `; } } }, render: function() { return (
{this.props.user.name} {this.props.user.mutualFriends.count} mutual friends
); } }); GraphQL + React

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var FriendInfo = React.createClass({ statics: { queries: { user: function() { return graphql` User { name mutualFriends { count } } `; } } }, render: function() { return (
{this.props.user.name} {this.props.user.mutualFriends.count} mutual friends
); } }); GraphQL + React

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var FriendInfo = React.createClass({ statics: { queries: { user: function() { return graphql` User { name mutualFriends { count } } `; } } }, render: function() { return (
{this.props.user.name} {this.props.user.mutualFriends.count} mutual friends
); } }); GraphQL + React

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Composition

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Composition

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Composition var FriendListItem = React.createClass({ render: function() { return (
); } });

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Composition var FriendListItem = React.createClass({ statics: { queries: { user: function() { return graphql` User { ?? ?? } `; } } }, render: function() { return (
); } });

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Composition var FriendListItem = React.createClass({ statics: { queries: { user: function() { return graphql` User { ${ProfilePic.getQuery(‘user’)}, ${FriendInfo.getQuery(‘user’)} } `; } } }, render: function() { return (
); } });

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Lifecycle

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Lifecycle var FriendListItem = React.createClass({ statics: { queries: { user: function() { return graphql` User { ${ProfilePic.getQuery('user')} ${FriendInfo.getQuery('user')} } `; } } } }); Static View

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Lifecycle var FriendListItem = React.createClass({ statics: { queries: { user: function() { return graphql` User { ${ProfilePic.getQuery('user')} ${FriendInfo.getQuery('user')} } `; } } } }); Static View FriendListItem

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Lifecycle Query { ')} ')} Static View

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Lifecycle Query { ')} ')} Static View ProfilePic FriendInfo FriendListItem

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Lifecycle Query Server ew

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Lifecycle { node(id: 1572451031) { name mutualFriends { count }, profilePicture { uri width height } } } Query Server ew

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Lifecycle y Server Data

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Lifecycle { "node": { name: "Daniel Schafer", mutualFriends: { count: 195 }, profilePicture: { uri: "http://...", width: 50, height: 50 } } } y Server Data

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Lifecycle Server Data Store

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Lifecycle Server Data Store Flux

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Lifecycle a Store Views

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Lifecycle
a Store Views

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Lifecycle Query Server Data Store Views Static View

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var FriendInfo = React.createClass({ statics: { queries: { user: function() { return graphql` User { name mutualFriends { count } } `; } } }, render: function() { return (
{this.props.user.name} {this.props.user.mutualFriends.count} mutual friends
); } }); Response Shape

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Lifecycle Query Server Data Store Views Static View

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Relay

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Pagination

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Pagination { "1572451031": { "name": "Daniel Schafer" } } { node(id: 1572451031) { name } }

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Pagination { "1572451031": { "name": "Daniel Schafer" } } { node(id: 1572451031) { name friends { name } } }

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Pagination { "1572451031": { "name": "Daniel Schafer", "friends": [ { "name": "Jing Chen" }, { "name": "Lee Byron" }, { "name": "Nick Schrock" }, { "name": "Joe Savona" } ] } } { node(id: 1572451031) { name friends { name } } }

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Pagination { "1572451031": { "name": "Daniel Schafer", "friends": [ { "name": "Jing Chen" }, { "name": "Lee Byron" }, { "name": "Nick Schrock" }, { "name": "Joe Savona" } ] } } { node(id: 1572451031) { name friends(first: 2) { name } } }

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Pagination { "1572451031": { "name": "Daniel Schafer", "friends": [ { "name": "Jing Chen" }, { "name": "Lee Byron" } ] } } { node(id: 1572451031) { name friends(first: 2) { name } } }

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Pagination { "1572451031": { "name": "Daniel Schafer", "friends": [ { "name": "Jing Chen" }, { "name": "Lee Byron" } ] } } { node(id: 1572451031) { name friends(first: 2 offset: 2) { name } } }

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Offsets? Offset 0 Offset 1

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Offsets? Offset 0 Offset 1

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Offsets? Offset 0 Offset 1

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Offsets? Offset 1 Offset 2 Offset 0

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Offsets?

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Cursors

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Cursors { "1572451031": { "name": "Daniel Schafer", "friends": [ { "name": "Jing Chen" }, { "name": "Lee Byron" } ] } } { node(id: 1572451031) { name friends(first: 2) { name } } }

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Cursors { "1572451031": { "name": "Daniel Schafer", "friends": [ { "name": "Jing Chen" }, { "name": "Lee Byron" } ] } } { node(id: 1572451031) { name friends(first: 2) { edges { node { name } cursor } } } }

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Cursors { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Jing Chen" }, "cursor": "3500401" }, { "node": { "name": "Lee Byron" }, "cursor": "4802170" } ] } } } { node(id: 1572451031) { name friends(first: 2) { edges { node { name } cursor } } } }

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Cursors { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Jing Chen" }, "cursor": "3500401" }, { "node": { "name": "Lee Byron" }, "cursor": "4802170" } ] } } } { node(id: 1572451031) { name friends(first: 2 after: 4802170) { edges { node { name } cursor } } } }

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Cursors { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Jing Chen" }, "cursor": "3500401" }, { "node": { "name": "Lee Byron" }, "cursor": "4802170" } ] } } } { node(id: 1572451031) { name friends(first: 2 after: 4802170) { edges { node { name } cursor } } } } { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Nick Schrock" }, "cursor": "37000641" }, { "node": { "name": "Joe Savona" }, "cursor": "842472" } ] } } }

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Cursors { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Jing Chen" }, "cursor": "3500401" }, { "node": { "name": "Lee Byron" }, "cursor": "4802170" } ] } } } { node(id: 1572451031) { name friends(first: 2 after: 842472) { edges { node { name } cursor } } } } { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Nick Schrock" }, "cursor": "37000641" }, { "node": { "name": "Joe Savona" }, "cursor": "842472" } ] } } }

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Cursors { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Jing Chen" }, "cursor": "3500401" }, { "node": { "name": "Lee Byron" }, "cursor": "4802170" } ] } } } { node(id: 1572451031) { name friends(first: 2 after: 842472) { edges { node { name } cursor } } } } { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [] } } }

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Cursors { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Jing Chen" }, "cursor": "3500401" }, { "node": { "name": "Lee Byron" }, "cursor": "4802170" } ] } } } { node(id: 1572451031) { name friends(first: 2) { edges { node { name } cursor } } } }

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Cursors { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Jing Chen" }, "cursor": "3500401" }, { "node": { "name": "Lee Byron" }, "cursor": "4802170" } ] } } } { node(id: 1572451031) { name friends(first: 2) { edges { node { name } cursor } pageInfo { hasNextPage } } } } { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Jing Chen" }, "cursor": "3500401" }, { "node": { "name": "Lee Byron" }, "cursor": "4802170" } ] } } }

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Cursors { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Jing Chen" }, "cursor": "3500401" }, { "node": { "name": "Lee Byron" }, "cursor": "4802170" } ] } } } { node(id: 1572451031) { name friends(first: 2) { edges { node { name } cursor } pageInfo { hasNextPage } } } } { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Jing Chen" }, "cursor": "3500401" }, { "node": { "name": "Lee Byron" }, "cursor": "4802170" } ], "pageInfo": { "hasNextPage": true }, } }

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Cursors { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Jing Chen" }, "cursor": "3500401" }, { "node": { "name": "Lee Byron" }, "cursor": "4802170" } ] } } } { node(id: 1572451031) { name friends(first: 2 after: 4802170) { edges { node { name } cursor } pageInfo { hasNextPage } } } } { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Jing Chen" }, "cursor": "3500401" }, { "node": { "name": "Lee Byron" }, "cursor": "4802170" } ], "pageInfo": { "hasNextPage": true }, } }

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Cursors { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Jing Chen" }, "cursor": "3500401" }, { "node": { "name": "Lee Byron" }, "cursor": "4802170" } ] } } } { node(id: 1572451031) { name friends(first: 2 after: 4802170) { edges { node { name } cursor } pageInfo { hasNextPage } } } } { "1572451031": { "name": "Daniel Schafer", "friends": { "edges": [ { "node": { "name": "Nick Schrock" }, "cursor": "37000641" }, { "node": { "name": "Joe Savona" }, "cursor": "842472" } ], "pageInfo": { "hasNextPage": false }, } }

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Connections in Relay

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Connections in Relay var FriendList = React.createClass({ render: function() { return (
{ this.props.viewer.friends.map( function(user) { return ; } ) }
); } });

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Connections in Relay var FriendList = React.createClass({ statics: { queries: { viewer: function() { return graphql` Viewer { friends { ${FriendListItem.getQuery(‘user’)}, } } `; } } }, render: function() { ... } });

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Connections in Relay var FriendList = React.createClass({ statics: { queries: { viewer: function() { return graphql` Viewer { friends(first: 10) { ${FriendListItem.getQuery(‘user’)}, } } `; } } }, render: function() { ... } });

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Cursors

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Declarative Pagination

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Connections in Relay var FriendList = React.createClass({ statics: { queries: { viewer: function() { return graphql` Viewer { friends(first: 10) { ${FriendListItem.getQuery(‘user’)}, } } `; } } }, render: function() { ... } });

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Connections in Relay var FriendList = React.createClass({ statics: { queryParams: {count: 10}, queries: { viewer: function(params) { return graphql` Viewer { friends(first: ${params.count}) { ${FriendListItem.getQuery(‘user’)}, } } `; } } }, render: function() { ... } });

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Connections in Relay var FriendList = React.createClass({ statics: { queryParams: {count: 10}, queries: { viewer: function(params) { return graphql` Viewer { friends(first: ${params.count}) { ${FriendListItem.getQuery(‘user’)}, } } `; } } }, onScrollLoad: function() { this.setQueryParams({count: this.queryParams.count + 5}); }, render: function() { ... } });

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Mutations

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Subscriptions

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Relay August 2015

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GraphQL https://github.com/facebook/graphql https://github.com/graphql/graphql-­‐js

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Thanks! Dan Schafer @dlschafer