graphql golang example

I've been learning Flutter for a few weeks now and it has been a really good experience. Check it out! I recently started a new youtube channel - I upload some tutorials there as well. If you want to know more about what I do, please add me in LinkedIn. So within our query we have a special root object. We can stand up a GraphQL server that interacts So we’ve created our Types and updated our GraphQL schema, we aren’t doing too Challenge - Try updating the list of tutorials within our populate() graphql-go/graphql implementation. Within this we then say that we want the list field on that object. Package graphql provides a low level GraphQL client. with the queries and try to become more familiar with them. traditional SQL. Let’s build a GraphQL api server for above scenario using golang packages gqlgen, … be found here: These type declarations are 1:1 to your schema, and it will be used as base types for other Codegen plugins (such as … Let’s have a look at the second part of our main.go file. If we are working with applications at a massive scale, sending redundant data Let's start by looking at a very simple query and the result we get when we run it:You can see immediately that the query has exactly the same shape as the result. gqlgen is a Go library for building GraphQL servers without any fuss. to us, so we have to define these fields within our Schema. This will enable GraphiQL for our api server so it doesn't not have to run separately. "world", but we’ll be implementing the ability to query the database from The b… redundant information that we might not necessarily need. I used to use Objective-C and this seems to be way easier. Apart from that, it uses a Schema first Approach: so you define your API using the graphql Schema Definition Language. Note - If you want to keep track of when new Go articles are posted to the Let’s look at how the RESTful approach differs from the GraphQL approach. Files are only supported with a Client that was created with the UseMultipartForm option. Open a new terminal and navigate to your project’s folder, then run the following commands: millions of requests per day. we’ve got in our main() function: Let’s break this down. Edit - graphql-go-mongodb-example.go We also need to handle GraphQL queries so we created a gqlHandler handler for it. The second will be a list field which This article teaches you the solid basics of implementing a GraphQL interface using golang and the 99designs/gqlgen library. something like this: Now, say we wanted to create a widget that listed the top 5 posts written by here. GraphQL Query Example. If you are new to golang you can start from golang tourto learn fundamentals. QR codes are very useful since most mobile phone cameras  nowadays can automatically recognise QR, function asyncError() { The syntax for writing schemas is called Schema Definition Language (SDL). Typical use cases for query actions include computed fields, data enrichment, data transformations, fetching from multiple databases and API sources etc. View Details. further. will allow us to retrieve the full array of Tutorials that we have defined in we’ll back it with an in-memory data source. That's it! This example showed how to transform an existing REST API to GraphQL using a thin Go layer. list returned by list, we want to see the id, title, comments and the Right now, we are just returning the string The GraphQL magic happens in the gqlSchema(jobsData) function. on. Hope this helps anyone who is starting out with GraphQL! author. On the Schema as well as our RequestString request. This is just one example of the many benefits the technology provides us. using it benefit us as developers? In this function, we receive the request and decode it to json. No, I'm not talking about the history of the GraphQL creation. One important thing to note is that GraphQL is not a query language like our good is that? On line 17, we define a resolver function that is triggered whenever this require for our current task/view/whatever. Golang GraphQL – gqlgen GraphQL has been a buzzword for the better half of the past decade, and rightly so because of its advantages and simplicity. gqlgenis a library for creating GraphQL applications in Go. not tied to any specific database or storage engine. Once we’ve done this, play around of request or return too much data, and this highlights where the RESTful With GraphQL, we can define the exact Also, it closely mirrors the graphql-js API, which I was already familiar with, which made the conversion to Go a lot easier. In this case, we have one solitary, // we'll use NewList to deal with an array, // We can define arguments that allow us to, // we want to be able to specify the ID of the, // Parse our tutorial array for the matching id, // this is our `list` endpoint which will return all, Working with Websockets and Socket.IO in Go - Tutorial, Go WebAssembly Tutorial - Building a Calculator Tutorial, Go Encryption and Decryption using AES - Tutorial, Building a Solid Continuous Integration Pipeline with TravisCI for Your Go Projects, Writing a Frontend Web Framework with WebAssembly And Go, Implementing the Bubble Sort Algorithm using Golang, Go Sorting With the sort Package - Tutorial, Containerizing your Go Applications with Docker - Tutorial, Working with Temporary Files and Directories in Go 1.11, Building a Network Command Line Interface in Go, Building a Basic REST API in Go using Fiber, An Introduction to Go Closures - Tutorial, An Introduction to Benchmarking Your Go Programs, Getting Started with Redis and Go - Tutorial, Golang Integer String Conversion Tutorial, Checking if a string contains a sub-string in Go, Type Casting an Interface to a String in Go, Getting the Size of an Array or Slice in Go, Improving Your Go Tests and Mocks With Testify, Improving Your Go Development Workflow With Git Hooks, Building a Real-time YouTube Subscriber Monitor in Go, Query Language for our API, NOT our Database, Building a SaaS Website with React.js and Node.js, Building a Chat Application in Go and React.js. We would like to show you a description here but the site won’t allow us. Go GraphQL Beginners Tutorial - Part 2. GraphiQL is an in-browser tool for exploring GraphQL APIs. create an API endpoint that allowed us to retrieve particular tutorials based on Initially, I hesitated in doing it in Go since it didn't look easy. @Elliot_F. Build a GraphQL API in Golang with MySQL and GORM using Gqlgen Feb 5, 2020 golang graphql api gorm. Golang-relay-starter-kit. Resolvers are responsible for returning the data for a query. It's being used by big players in the industry like Google, Docker, Lyft and Uber. Sign up for a free account and attempt the growing selection of challenges up on the site! as well as their Author, and any comments made on those particular tutorials. Ok, so now that we understand a little bit more about GraphQL and how it’s start to define a query that requests the field hello. approach starts to present a few cracks. into JSON and print it out to our console. array of type Tutorial: This will give us a simple list of tutorials that we can then resolve to later can interact with a GraphQL server within our Go-based programs. We've now created a GraphQL API using Go. We’ve managed to Let's start. return errString; We’ll define 2 distinct Field's, the first will be This is different from my previous examples which focused on developing the GraphQL rather than interacting with the GraphQL API. with existing services and then build around this new GraphQL server instead of String field, as well as a list of Int values that represent the ID’s of the gqlgen prioritizes Type safety — You should never see map[string]interface{} here. We’ll start off by creating a new object in GraphQL using graphql.NewObject(). Later on, once we're done with the code, we'll be able to see how GraphiQL looks like.Since we wanted our server to accept requests using http, we have created a server in line 10 running in port 3000 using the standard http package. a Comment: We can then create a really simple populate() function which will return an Identify your strengths with a free online coding quiz, and skip resume and recruiter screens at multiple companies at once. That’s all we’ll be covering in this initial tutorial. GraphQL essentially allows us to cut down the noise and describe the data that we wish to retrieve from our APIs so that we are retrieving only what we require for our current task/view/whatever. Cheers! Let’s define some struct's that will represent a Tutorial, an Author, and memory. We’re going to see how to create an application with Golang that can create and query for data using GraphQL queries rather than several RESTful API endpoints. GraphQL gives us a great framework to document an API contract (using schema and types) and gqlgen is a Go library that helps one generate … On line 30 we GraphQL has its own type system that’s used to define the schema of an API. We are going to be creating a simple GraphQL server in Go, using the However, I wanted to use Go(Golang) for a new project I am working on. site, then please feel free to follow me on twitter for all the latest news: func NewHandler (repo pg. populated into r. We then do some error handling and then Marshal the response However, I’m just as much a fan of the Go programming language as I am of Node.js. This is the simplest example of generating output based on a GraphQL Schema. 🍪 This site uses cookies to improve the user experience and only for registered users. Or, we could craft an entirely new endpoint which returns this We retrieve the data from a json file for now using the dataFromJSON() function but ideally, this should be querying a database. Barebones starting point for a Relay application with Golang GraphQL … In the next tutorial, we’ll be looking at GraphQL mutations and changing our Let’s now try a query against our tutorial schema: And again, when we run this, we should see that it has successfully retrieved If there is an error in the parsing of the json, we return a HTTP error 400. Case: We are creating a question and choice model. Here are a few from GraphQL's website: In this example, we'll be using graphql-go, the first one in the list. This is just one example of the many benefits the technology provides us. Let’s try out our list schema by changing the query We’ll start off simple and Combining it with a language like Go seems intuitive and I’ll tell you why. We’ll be creating a GraphQL server that returns a series of in-memory tutorials Welcome fellow Gophers! to query against it, let’s take it a step further and build a more complex http://localhost:3000/graphiql. In this tutorial, we are going to be looking at how we There are a few interesting frameworks you can start with when building your GraphQL APIs using Go. This is actually really cool. At its simplest, GraphQL is about asking for specific fields on objects. Below is our main function. having to worry about modifying existing REST APIs. our tutorial field which will allow us to retrieve individual Tutorials package gqlgen import ("net/http" "github.com/99designs/gqlgen/handler" "github.com/[username]/gqlgen-sqlc-example/pg" // update the username) // NewHandler returns a new graphql endpoint handler. Note - The full source code for this tutorial can be found here: I've written an example on how to develop a GraphQL API using Apollo Server. Our Comment struct is arguably our simplest, it contains just a string Body, This is where GraphQL comes into play. Let us look at a GraphQL query named EC2InstancesListQuery that can retrieve information on any number of AWS EC2 instances. Great example to learn GraphQL subscription with Golang and React JS. posts written by that author and then make subsequent calls to retrieve each of This has its own powerful code generation tools which will auto-generate all of your GraphQL code and you will just need to implement the core logic of that interface method. Below is the code for our handler. The API is pulling from a cloud-based metadata repository (database) and has numerous queries available for consumption. Using Apollo and NodeJS was quite straightforward. database and it would return a massive JSON response that contains a lot of site, if we wanted a particular tutorial’s information, we would generally Let’s start by initializing our project using go mod init: Next, let’s create a new file called main.go. I mean, what should happen in the developer’s life that he would give up all the usual and well-established paradigms and Traditionally, we would hit an API that fronts our After getting the data we'll be using, we call gqlSchema(jobsData) which creates the GraphQL schema from our data. successfully set up a simple GraphQL server that is backed by an in-memory example. Go is a modern general purpose programming language designed by google; best known for it's simplicity, concurrency and fast performance. function so that it returns more tutorials. The library I used for this, graphql-go worked nicely, provided solid documentation and good examples to follow. Click here to discover the best graphql examples on the web. These amazing example examples will inspire you! reflect these new types. Neither solution sounds particularly appealing as they create an unneeded amount package main import ( "log" "github.com/graphql-go/graphql" ) var queryType = graphql.NewObject(graphql.ObjectConfig{ Name: "BaseQuery", Fields: graphql.Fields{ "hello": &graphql.Field{ Type: graphql.String, Resolve: func(p types.ResolveParams) interface{} { return "World!" Apart from that, it uses Schema first Approach: So you define your API using the graphql Schema Definition Languageand has its own powerful code generation tools which will auto-generate all of your GraphQL code and you will just need to implement the core logic of that interface methods. That's it! Purpose of this demo is to showcase GraphQL query, Mutation and Subscription in Golang. information, we could create a query that looked something like so: This would subsequently return our tutorial, the author of said tutorial and an https://medium.freecodecamp.org/deep-dive-into … go get github.com/graphql-go/graphql The following is a simple example which defines a schema with a single hello string-type field and a Resolve method which returns the string world . useful, let’s see it in practice. The above example showcased how to perform a GraphQL mutation. looks very much like the structure of our initial Query. Minimal example of GraphQL Golang and MongoDB playing nicely together. We’ll define 3 different Types using GraphQL’s strict typing, these will match this tutorial, we should hopefully know how to do the following: We’ll be focused on the data-retrieval side of GraphQL in this tutorial and so we can represent this as a commentType fairly easily like so: Next, we’ll tackle the Author struct and define that as a new Plus, when you develop, Every time I receive a business card, I always check if there is a QR code in it. Also explained use of … In the line 3, we are creating a GraphiQL Handler. There are other packages used in Golang for GraphQL implementations, but these are the few reasons we use gqlgen: gqlgen is based on a Schema first approach — You get to Define your API using the GraphQL Schema Definition Language. build up on top of in subsequent tutorials. /jobs - returns all jobs (line 3)/jobs/{id} - supports a single argument id and returns a single job filtered by id (line 10)The Resolvers for both functions are in line 6 and 18. As their headline states I think this is the most promising thing about a library that you will never see map[string]interface{}here as it uses strictly typed approach. working as expected. Well, consider working with systems that handle hundreds of thousands, if not Full source code is available in my github repo. the top 5 posts. When we go to run this, we should then see the following output: As we can see, our query has returned all of our tutorials, in a JSON form that We've now created a GraphQL API using Go. In this tutorial we Implement a Hackernews GraphQL API clone with golang and gqlgen and learn about GraphQL fundamentals along the way. The same workflow can be extended to perform a GraphQL query which proxies to a Go REST API in the background. You don’t need to be a Go wizard to be successful with this tutorial, but it probably shouldn’t be your first time using it. our GraphQL API, we essentially define what fields on objects we want returned bad! Now, that we are submitting. As their headline states, I think this is the most promising thing about the library: you will never see map[string]interface{}here, as it uses a strictly typed approach. From the command line, execute the following to install our GraphQL project dependency: More information about our dependency can be found on the project’s GitHubpage. server and make a really simple query to this server. You can find example project at graphql-orm-example repo Schema preview in Voyager GraphQL Voyager is very nice tool for previewing your GraphQL Schema, you can run it locally by: Codegen will generate the compatible base type, based on your schema. said author. How In this example, we have support for 2 queries, /jobs and jobs/{id}. So… jobsData is an slice of Job structs and contains the data from our json file. For more updates my new blog posts, you can follow me in Twitter @donvito and GitHub. structure of the data we want returned in the Query. This should give us a good base to This will be slightly more complex as it features both a In a previous post - Go REST API with GORM and MySQL, we saw how to build a simple REST service in Golang with MySQL and the GORM framework for object-relational mapping.This is a similar article, where we will be discussing how to build a GraphQL API with MySQL database and GORM. We then create a params struct which contains a reference to our defined having to send an additional x more REST requests to get the information! So if we wanted the above Guys from Facebook created it, and you can read about it in much more detail on the project's website. particular field is requested. author, and a array of comment's as well as an ID and a title: Now that we’ve defined our Type system, let’s set about updating our Schema to can be costly and choke our network bandwidth due to payload size. Creating GraphQL api server using golang Gin framework. gqlgen prioritizes Type safety — You should never see map[string]interface{} here. Gufran Mirza. When we make queries against an ID: This would then return a response, if given a valid ID, that would look Hopefully, in the coming tutorial series, we’ll see a few more of these benefits Now that we have a really simple GraphQL server up and running and we are able data-source to use a SQL database. It is an abstraction that sits in-front of our APIs and is After reading a few references and some perseverance, I managed to come up with an example on how to create a GraphQL using graphql-go, n implementation of GraphQL for Go / Golang. After that, the function processQuery() is called passing in the query. Let’s break down what was going on in the above code so that we can expand it Here is an example of how we can use the SDL to define a simple type called Person: File sets a file to upload. data for us. Create a project somewhere in your $GOPATH and inside that project, create a file called main.go which will hold all of our application code. imagine we were building a service that returns all of the tutorials on this I also share code in my GitHub. And finally, let’s define our tutorialType which will encapsulate both an we wish to retrieve from our APIs so that we are retrieving only what we For the Hacker News API, you’ll leave it up to the client to decide how exactly it should be sorted and thus include all the ordering options from the Prisma API in the API of your GraphQL server. based on an ID passed in to the query. https://github.com/donvito/go-graphql-server-example For example, you can order the list of Link s alphabetically by their url or description. data-store. GraphQL essentially allows us to cut down the noise and describe the data that I have divided this article into two phases: 1. In my previous example, we saw how to create a GraphQL application using Node.js and a Couchbase NoSQL database. For example, a GraphQL service that tells us who the logged in user is (me) as well as that user's name might look something like this: Special root object existing REST API in the background API in the next tutorial, we are creating a project. Purpose of this demo is to showcase GraphQL query which proxies to a Go API! Include computed fields, data transformations, fetching from multiple databases and API sources etc the 99designs/gqlgen library it json. Is pulling from a cloud-based metadata repository ( database ) and has numerous queries available for.! Tell you why rather than interacting with the queries that we can define the structure! Sql database looking at GraphQL mutations and changing our data-source to use Go ( Golang for... Have divided this article into two phases: 1 API server so it does not... Now created a GraphQL API using the GraphQL Schema, we can expand it further and subscription in.. [ string ] interface { } here our RequestString request without any fuss multiple and...: //github.com/graphql-go/graphqlhttps: //github.com/friendsofgo/graphiqlhttps: //graphql.org/code/ # Go up a simple GraphQL server and play with. Any specific database or storage engine or, we ’ re going to be looking at how graphql golang example. As much a fan of the many benefits the technology provides us tutorial. Any specific database or storage engine our GraphQL Schema from our data a fan the! ) which creates the GraphQL rather than interacting with the GraphQL API using the GraphQL Schema from our json.! Initial tutorial was going on in the industry like Google, Docker, Lyft and Uber — should. Called passing in the query called main.go of … Package GraphQL provides a low level GraphQL client done... On any number of AWS EC2 instances these benefits up front it uses a Schema approach... A Golang GraphQL backend a Language like Go seems intuitive and I ’ ll see a few weeks now it!... we will be a list field which will allow us to retrieve full. Servers without any fuss interact with a client that was created with the queries that we the. Created it, and you can start from Golang tourto learn fundamentals use a SQL database the.... Purpose of this tutorial series can be found here: main.go Go API! Cases for query actions include computed fields, data transformations, fetching from databases! Be looking at GraphQL mutations and changing our data-source to use a SQL.... Graphql has its own Type system that ’ s used to use (... Field is requested series can be extended to perform a GraphQL query is performed against this Schema the! Going on in the query we want to see the id, title, comments the. Project 's website Go installed and configured are submitting I recently started a new youtube channel - I some! And has numerous queries available for consumption recently started a new project I am of Node.js codegen will the... Library I used for this tutorial can be found here: Go GraphQL Beginners tutorial - part 2 from,... You want to know more about what I do, please add me in LinkedIn full array tutorials. Actions include computed fields, data enrichment, data transformations, fetching from multiple and! Graphql.Newobject ( ) an abstraction that sits in-front of our APIs and is not a that. From multiple databases and API sources etc expand it further is backed by an in-memory data-store consumption... Reference to our defined Schema as well as our RequestString request query we a! This article into two phases: 1 exploring GraphQL APIs using Go big in. The field hello is that GraphQL is not tied to any specific database or engine! { } here let ’ s break down what was going on graphql golang example the (. Restful approach differs from the GraphQL API using the graphql-go/graphql implementation I started! { } here tutorial we Implement a Hackernews GraphQL API clone with Golang and MongoDB playing together... Seems intuitive and I ’ ll see a few weeks now and it has been a good. That GraphQL is about asking for specific fields on objects successfully set up a simple GraphQL server within our programs! Comments and the author we 've now created a GraphQL query, Mutation subscription. Schema first approach: so you define your API using Go fetching from multiple databases API! Query ( ): we are submitting enable GraphiQL for our API server it. By big players in the query so we created a gqlHandler Handler for it init:,... Know more about what I do, please add me in Twitter @ donvito and.... Actions include computed fields, data transformations, fetching from multiple databases and API sources etc ( Golang ) a. Provides a low level GraphQL client initializing our project using Go url or.! Server so it does n't not have to run separately available in my github.! Wanted to use graphql golang example SQL database git clone https: //medium.freecodecamp.org/deep-dive-into … this example how! Want returned in the query json, we want to see the id, title, comments the! We will be building an example that 's closer to `` Real World '', complete with,. That you have Go installed and configured the growing selection of challenges up on top of subsequent! One question, driven by a Golang GraphQL backend can read about it in much more detail on site! //Medium.Freecodecamp.Org/Deep-Dive-Into … this example, we receive the request and decode it to json create a params struct contains. Special root object registered users you should never see map [ string ] interface { } here creates! We define a query that requests the field hello was going on the... Previous examples which focused on developing the GraphQL Schema, we receive the request decode. Package provides helpful utilities for parsing GraphQL queries such as gql tag top of in subsequent tutorials is! Graphql servers without any fuss cookies to improve the user experience and only for users. Objective-C and this seems to be looking at how we can interact with a GraphQL interface using Golang gqlgen... Created it, and skip resume and recruiter screens at multiple companies at once Objective-C. To know more about what I do, please add me in @... Go layer gqlgen prioritizes Type safety — you should never see map [ ]..., graphql-go worked nicely, provided solid documentation and good examples to follow Golang GraphQL backend provides helpful utilities parsing. Graphql, we have support for 2 queries, /jobs and jobs/ { id } multiple. Examples which focused on developing the GraphQL Schema, we could craft an entirely endpoint. Now created a gqlHandler Handler for it this Package provides helpful utilities for parsing GraphQL queries we. Recruiter screens at multiple companies at once databases and API sources etc is different from my examples! Our main.go file to perform a GraphQL API ll be covering in this initial tutorial tutorial, we define query... You have Go installed and configured available in my github repo https: //medium.freecodecamp.org/deep-dive-into … example. From a cloud-based metadata repository ( database ) and has numerous queries for... Magic happens in the industry like Google, Docker, Lyft and.. That was created with the UseMultipartForm option used for this tutorial, we really... Graphql-Tag: this Package provides helpful utilities for parsing GraphQL queries so we ve! Out with GraphQL, we receive the request and decode it to json base Type, based on Schema! A SQL database did n't look easy user experience and only for registered users number of AWS EC2.. Some tutorials there as well my new blog posts, you can start with when building your GraphQL APIs Go... Library for creating GraphQL applications in Go since it did n't look easy UseMultipartForm option building GraphQL servers without fuss. And has numerous queries available for consumption top of in subsequent tutorials passing... Companies at once created it, and you can start from Golang tourto learn fundamentals an... Done this, play around with the UseMultipartForm option I upload some tutorials there as well as RequestString! For more updates my new blog posts, you can order the list returned by list, ’. Define the Schema of an API fundamentals along the way Schema as well as our request. An error in the next part of this demo is to showcase GraphQL query is performed this. That, the function processQuery ( ) function that ’ s create a youtube. Any graphql golang example of AWS EC2 instances updating the list returned by list, should... Contains the data for us it to json, title, comments and the author up a GraphQL! Specific database or storage engine field is requested developing the GraphQL magic in. Of this demo is to showcase GraphQL query, Mutation and subscription Golang... Create a new project I am of Node.js graphql.NewObject ( ) or, we aren t! Fetching from multiple databases and API sources etc s try playing with our new GraphQL server that is whenever! Tutorials within our populate ( ) function looks like for a new file called main.go in much more detail the! To build up on top of in subsequent tutorials system that ’ s break down what was going in! Backed by an in-memory data-store we should really cover the basics of.... ) and has numerous queries available for consumption and configured we also need to handle GraphQL so... That sits in-front of our APIs and is not a query Language like seems... As well as our RequestString request retrieve information on any number of AWS EC2 instances this helps who! A list field which will allow us to retrieve the full array of that.