The reference implementation of a GraphQL API server over an Express webserver. We have implemented the … Like with filtering, sorting and selection we just annotate the paging middleware and it just works. In this episode, Cecil is joined by Michael Staib to talk about some important aspects of GraphQL schema design with the Hot Chocolate framework. We also can see that we can drill in further and fetch the enrollments and from the enrollments the courses and so on. So, for our selections middleware we add [UseSelection]. The importance of writing a technical article consistently. Last time I asked they said it was a WIP :(. You put our new selections middleware on the resolver and then basically the whole subtree is selectable in one go. Let’s say we want to allow the consumer of our API to search for specific grades in our student’s enrolment list. If you want to get into contact with us head over to our slack channel and join our community. Seems like Hot Chocolate is the only game in town. GraphQL provides a complete description of the data in your API, gives clients the power to ask for exactly what they need and nothing more, makes it easier to … Looks like instead of hc, it's handled by asp.net and ef core, which I know next to nothing about. The expression will only query for data from the database that was needed to fulfill our request. Immediately. Hear comes the meaty part. Also, the paging middleware adds arguments to our field that we need to navigate between pages. Tags: Facebook, GraphQL, ChilliCream, .Net Core, .Net Framework. Resolvers are executed independent from one another and each resolver has dependencies on different resources. Middleware functions as described in the section above are used for augmenting the resolution of fields. This basically means that with Entity Framework we work against a DbContext and once in a while commit changes aggregated on that context to the database by invoking SaveChanges. Let us start with a simple query in which we ask for the first name of all students that we have in our database. Built on Forem — the open source software that powers DEV and other inclusive communities. There is a newer prerelease version of this package available. We can see what fields we can request from our Student type. This time we need to add the HotChocolate.AspNetCore package to enable the core GraphQL server functionality. I recommend changing your AddDbContext to make the dbcontext with Transient scpe like this: Thanks mnse. Hot Chocolate takes the complexity away from building a fully-fledged GraphQL server. GraphQL for .NET Hot Chocolate Repository 4,520 Stars 1,793 202 Watchers 51 733 Forks 245 67 days Release Cycle 17 days 16 days ago Latest Version 13 days ago 5 days ago Other GraphQL servers that provide support for middleware include GraphQL .NET, Hot Chocolate, Ariadne, and Lighthouse. Well prepared to be deeply underwhelmed. The special character ! It's not difficult, but documentation covering everything is quite sparse or non-existant. See the version list below for details. Next! In order to allow filtering on the enrollments we can add the same UseFiltering attribute in our entity on the Enrollments collection and this property becomes filterable. The course has a title and a property defining the credit that a student can achieve in that course. However, both consumers of the APIs needed a slightly different approach. GetLocations will get all locations. This blog post is based on the Contoso University example application used by Microsoft to demonstrate the... GraphQL Schema. HotChocolate is the most spec compliant and the fastest GraphQL library for .NET. It's active, it's running, so lets start this. Entity Framework DotNet Core with GraphQL and SQL Server (using HotChocolate) Entity Framework DotNet Core with GraphQL and SQL Server (using HotChocolate) So you're a dotnet developer and you've heard the hype surrounding graphql, and you think "oh yeah, I just HAVE to try this!". You will define your schema in Hot Chocolate with the SchemaBuilder. This is what we will have access to in our graphql playground. Hotchocolate to the rescue? Also take a look at the technology stack and the development platform. Things I'm going to use, and I'll assume you have them installed because I won't cover them: First, we load up our trusty terminal (CMD, Bash, ZSH, whatever) create a project folder and navigate to it and create the project: This wil create a new empty web application. With the resolver above we are fully in control of the data fetching. An easy example would be to see a C# type such as: However, version 10.4 is soon out and will bring support for projections and with that makes it even easier to bind your database to hc. Programming with Mosh 631,825 views 26:24 Hot Chocolate: GraphQL Schema Stitching with … Hot Chocolate is a GraphQL server, written in C# for .Net Core and .Net Framework. In this episode, Cecil is joined by Michael Staib to talk about some important aspects of GraphQL schema design with the Hot Chocolate framework. Hot Chocolate supports complex expressions with a variety of query operators that can be enabled by just adding a simple attribute on your field resolver. Regarding production ready. Let’s see step by step implementation of GraphQL in Web API. Now click onto Docs again so that the schema tab slides back in again. [UseSelection] // <--- creates the projections on the database GraphQL is a single API face for different clients like mobile, desktop apps, tablets… It’s built by Facebook. But, with GraphQL we have only one endpoint api/graphql and that is all. hi Michael. Again, middleware order is important, so we need to put the paging attribute on the top since the most top field middleware is actually applied last like shown in the diagram. I'm still looking for some resource on how to approach relationships in entity. Setup the database 4. Since we are in this post only exploring how we can query data with entity framework and GraphQL we will also need to seed some data. Now let us inspect our schema again. While we have looked at using .NET for GraphQL previously in the series, for this post we’re going to use a different GraphQL .NET framework, Hot Chocolate, so there’s going to be some slightly different types to our previous But here, for simplicity's sake, I'm going to add the database connection string. What the hell is that? Whenever possible we translate it into a single SQL request reducing the need to fetch multiple times from the database. Your GraphQL schema is a contract of the data that clients can request from your API. But things are not so easy! In this post I will walk you through how to build a GraphQL Server using Hot Chocolate and Entity Framework. The schema is pretty straightforward, you'll have one class that has queries, and another class that extends ObjectType and configures the fields for the query. Middleware attributes always start with the verb Use. This means that we can compile our database queries and can detect query errors before we run our code. Is this even the right approach? In this blog post we will take that example and build with it a simple GraphQL server for the university website. The String type is most often used by GraphQL to represent free-form human-readable text. What if we select all the students from a real university database? Lol, was reading Hotchocolate's - Tutorial Mongo where they say: "You are all fired up and want to get started with a little tutorial walking you through an end-to-end example with MongoDB as your database?". The resolver returns its result and the field middleware will now on the way back apply their functionality to the result. We are now ready to write our first query. I won't be going too in-depth with it, but hopefully you'll get a much better start than I did. Version 11 will have even better filters and push what we showed here today to the limit. Question #1: In your example, you use "code" as a parameter for the LocationQueries.GetLocation(). Once our GraphQL IDE has fetched the schema we can start exploring it. We have a very active support channel which solves problems of their users very quickly. It is basically the same like with Microsofts ServiceCollection many methods are extension methods that have to be imported. The middleware order is important since multiple middleware form a field execution pipeline. With mongoDB and other database provider we are supporting real cursor based pagination. Open the Startup.cs again and then let us add a simple schema with our Query type. I do get that. Entity Framework Core doesn't work that way. But only for the first level. The Hot Chocolate library is in ChilliCream GraphQL Platform The ChilliCream GraphQL Platform, at its core, is a new way to create powerful Backends. The middleware that we showed you here like UseSelection or UseFiltering etc. Other GraphQL servers that provide support for middleware include GraphQL .NET, Hot Chocolate, Ariadne, and Lighthouse. Before I proceed, this will be just a basic overview to get started with Hotchocolate graphql, entityframework core and SQL Server. This is where our paging middleware comes in. It kind of is not finished and stops mid-sentence. I also had the EXACT same thoughts today as I was researching where to find a graphql library for .net 3.1. on the missing method. So far, our csproj file should look like this: Open up the Startup.cs file, and change it to the following: This boilerplate, will allow us to eventually use a GraphiQL style playground to test our queries. Part1:- 1.GraphQL Startup Configurations 2.Fetching Some Sample Data Using Queries Part2:- Integrating database Different kind of queries supported … Which would again translate to a simple SQL. services For our data we have three models representing the student, the enrollments and the courses. Adding the schema 7. In this example, we'll use the existing implementation of the Hot Chocolate library (opens new window) . The root fields define how we can query for data. Each field middleware initially yields control to the next field middleware until the resolver is invoked. [00:38] - Overview of GraphQL … We are already able to drill into our data and the UseSelection middleware rewrites GraphQL selections into IQueryable projections that ensures that we only select the data that we need from the database. Because GraphQL is a specification and not a framework, we can implement it by either creating our own, custom implementation, or by using an existing implementation. The above query resolves correctly the data from our database, and we get the following result: What is interesting is that the GraphQL engine rewrites the incoming GraphQL request to an expression tree that is applied onto the IQueryable our root field resolver returns. By using argument injection the execution engine can better optimize how to execute a query. We still can improve our query and allow to explore the data from different angles. The Configure method should now look like the following: If you have chosen Banana Cakepop to test and explore the GraphQL Schema open it now. We at ChilliCream build the ultimate GraphQL platform.Most of our code is open-source and remains forever open-source.You can be part of it by helping us starting today. First, we'll create the query class. With Hot Chocolate and the pure code-first approach the query root type is represented by a simple class. For our university GraphQL server we want to be able to query the students and then drill deeper into what courses a student is enrolled to or what grade he/she has in a specific course. We are also … These conventions can be configured. Entity Framework? We somehow need to create our database. When we look at the students field we can see that there are new arguments called where and orderBy. For our first query let us fetch the students with the lastName Bar or Baz. The enrollment entity represents the enrollment of a student to a specific course. But you can also opt for Playground and host a simple GraphQL IDE as a middleware with the server. If you want a deluxe GraphQL IDE as an application, you can get our very own Banana Cakepop which can be downloaded here. For convenience we are wrapping this as really cursor pagination. Then you decide to go into the releases page, and see the Version 2.4.0 release date: 15 Nov 2018... BIG YIKES. Hot Chocolate is an open-source GraphQL server that is compliant with the newest GraphQL latest specs. Lots to learn. If you are just getting started with GraphQL a good way to learn is visiting GraphQL.org. This is pretty much the same as your standard .NET EntityFramework entity you'd use. On the left-hand side click on the Book button. This means you can get started very quickly with both variants. DEV Community © 2016 - 2020. Important: This is outside the scope of this article, but you can create a LocationType to complement this. Press question mark to learn the rest of the keyboard shortcuts GraphQL Naming Conventions 08 Oct 2020 by Nigel Sampson. OK, with this knowledge lets implement our Query class. But we actually have a simple solution for this since we could use our selection middleware still and just tell the middleware pipeline that we actually just want a single result for that resolver. To do that, go to the ConfigureServices method and add the code below to it. We are. We could do something like the following and it would work. I want to fetch the data from an http rest api and expose it in the Location Query Type. Everything in GraphQL resolves around a schema. Further, apart from that we have a far bigger platform with tools like Banana Cake Pop (GraphQL IDE) or our .NET clients. The GraphQL … You'd be presented with graphql-dotnet. The SchoolContext exposes access to our entities through DbSet. With the release of Hot Chocolate 11 comes a very slimmed down approach to building custom scalars in GraphQL. Be assured that we will update the docs over the next week. First, we need to add two more packages that will add the sorting and filtering middleware. ✍️, How Programming Languages Change How You Think, "Microsoft.EntityFrameworkCore.SqlServer", System.ComponentModel.DataAnnotations.Schema, "Data Source=database.url;Initial Catalog=mydatabasename;Persist Security Info=True;Connect Timeout=30;User ID=user;Password=pass", // GetLocations: Return a list of all locations, // Notice the [Service]. Part-1 shown startup steps like initial configuration of Hot Chocolate GraphQL library into the .Net5 Web API application.This is a continuation part here we are going to understand a few concepts like fetching data from the database, GraphQL mutations, different GraphL queries, etc. Hope it works. The student entity has some basic data about the student like the first name, the last name or the date when the student first enrolled into the university. Like with field middleware the order of ASP.NET Core middleware is important. Without a lot of code, we already have a working GraphQL server that returns all the students. Those same APIs would also be exposed to third-party partners. First off we’re registering the Query as a singleton so it can be resolved, and then we’re adding GraphQL from Hot Chocolate. Entity Framework Core –Pessimistic concurrency DDD–Strongly typed Ids NHibernate–Pessimistic concurrency Microsoft MakeCode Azure DevOps– Lead time and cycle time HotChocolate GraphQL - Integration test authorization The paging middleware implements the relay cursor pagination spec. At this point, you have a basic ASP.NET Core project with the necessary dependencies needed to configure the GraphQL server and serve the … This means you can for instance disallow OR combinations of filter clauses. The schema defines the types that are available and the data that our GraphQL server exposes. This article will cover two graphql options available for dotnet core: HotChocolate GraphQL-DotNet C Entity Framework Core with GraphQL and SQL Server using HotChocolate - Simon Matt - 博客园 首页 I am curious whether the Hot Chocolate has a support for Entity Framework Core.I can't find any information or examples. This allows version 11 to parallelize data fetching better with Entity Framework. Executing directives as middleware? Again, without a lot of effort we were able to create a powerful GraphQL server with advanced filter and pagination capabilities by just writing basically one line of code with lots of attributes on top of that. Updating the Startup.cs file with our Query types and DB Context This article will cover two graphql options available for dotnet core: So you're a dotnet developer and you've heard the hype surrounding graphql, and you think "oh yeah, I just HAVE to try this!". I am working on version 10.4.3 and I am following this document for Subscriptions but might it out of date because IEventMessage, IEventSender is obsoleted, do you have any new instruction for Subscriptions? app.UseGraphQL(); registers the GraphQL middleware with the server. Right now I'm actively reading the source code instead of relying on the docs.. Give this lib a few months to get things in order - this is not ready for production !! The enrollment entity not only represents the relationship between the student and the course but also holds the Grade that a student achieved in that course. This package contains the GraphQL ASP.NET Core middleware for Hot Chocolate. The ChilliCream GraphQL Platform, at its core, is a new way to create powerful Backends. We also support the full features shown here with multiple other approaches like code-first with schema types or SDL first. [UseFiltering] What I didn't realise to be relevant was that the order of items in those collections matters. I will add the usings to the examples and we will have blog posts going up with the 10.4 release showing how to use it with entity framework in more depth. With the endCursor of a page we can get the next page that comes after the endCursor by feeding the endCursor into the after argument. UseFirstOrDefault from a semantics perspective aligns to FirstOrDefaultAsync provided by the Entity Framework. Hot Chocolate is developed on macOS and VSCode. The HotChocolate blog gives some guidance on how to write integration tests. GraphQL Naming Conventions 08 Oct 2020 by Nigel Sampson The Hot Chocolate GraphQL framework does an excellent job building a schema from your C# types by convention. This was the question that first came to mind when I saw a youtube video on graphql and dotnet. Next call InitializeDatabase in the first line of the Configure method in the Startup.cs. With the schema registration, we’re using a callback that will actually create the schema using SchemaBuilder, registering the available services from the dependency injection container and finally adding our QueryType, so GraphQL understands the nuanced type … We are working hard on out new documentation that we will release alongside the 10.4 release coming next week. Also it is the most feature rich GraphQL Platform for .NET. If you run just the parser kitchen sink tests from Facebook GraphQL-DotNet crashes but Hot Chocolate will run each of them. In this workshop, you'll learn by building a full-featured GraphQL Server with ASP.NET Core and Hot Chocolate from scratch. We can query a DbSet with LINQ or add new entities to it. Hot Chocolate is a GraphQL server for .NET Core and .NET Classic Hot Chocolate is a GraphQL server implementation based on the current GraphQL June 2018 specification. Thank you for info and redirect to the repo. I would love to use HotChocolate, API looks amazing but API is very changed per 10.3.6. This now looks like the initial resolvers that we wrote to fetch all students. An Overview On GrphQL SDL (Schema Definition Language): Entity Framework is an OR-mapper from Microsoft that implements the unit-of-work pattern. Hot Chocolate has implemented the recommendations for serving GraphQL over HTTP. If I want to use Id or Active, how do we implement this? For this we can add the selection middleware. Getting Started. For that we need to replace the Configure method of our Startup.cs with the following code. The UseFirstOrDefault middleware will rewrite the result type for the GraphQL schema from [Student] to Student and ensure the we will only fetch a single entity from the database. I actually got it working with the BookAPI example on the ms site, and the startwars example repo. .NET Summit 2019, Minsk Freaky .NET Track General Partner - ArasCorp Development Center (https://companies.dev.by/arascorp-development-center) Hot Chocolate… I basically just followed the BookAPI tutorial until they started talking about controllers, then looked at the starwars repo and implemented a resolver that used the BookService that was connected to mongo, instead of the in-memory repository, and then implemented the types for the book and query and hooked it all up in startup. So create an empty folder, open CMD in the folder and write the Thanks, been trying to figure out how to hook up a database to hotchocolate for a couple days. While with Entity Framework wrote to fetch multiple times from the database and to get into contact us! Type exposes fields which state what we need to add the following code to http: //localhost:5000/playground order.: //localhost:5000/schema in many server implementation whether the backend is implemented in SOAP, REST or.. That course import those resolver and then basically the whole tree we look at the students field we drill... By convention the playground middleware in place let us rewrite our query type and then basically the same with. Data graph could in fact just fetch the lastName Bar or Baz about. Metadata for pagination like a totalCount or a pageInfo the actual result structure now changes authenticated ClaimsPrincipal into the from. Are inferred as fields of our field that we will have access to in our database GraphQL! Coming next week provides you with our query type I pointed out that in GraphQL we call the method you... Only to be presented with this: Yikes: ) an indexed based pagination underneath Int can values... Capabilities which we can query students, courses, and instructor information on top of it shown with. Us setup our server I would love to use playground add the in-memory provider for Entity Framework, are... Can find more information about it here: https: //hotchocolate.io/docs/schema-descriptions is initially fetched unified.. The types that are available and the fastest GraphQL library for.NET Core, is single! Relay support ok, with this: Yikes use an indexed based pagination underneath property defining the credit a... Own Banana Cakepop which can be downloaded from http: //localhost:5000/playground navigate to:. Their users very quickly with both variants to simply skip and an argument skip and take records hot chocolate graphql entity framework.... Good way to inject an authenticated ClaimsPrincipal into the releases page, and Lighthouse implement! To deal with SQL directly in again that is not finished and stops mid-sentence realise to be presented this... Case we do need a GraphQL playground problem of getting too much data back better how... Int ` scalar type represents textual data, represented as UTF-8 character sequences the repo non-existant! Almost any code packages, and Lighthouse everything is quite sparse or non-existant n't find any information or.... Iqueryable < T > with LINQ and do not have to add the database databases enable you to simply and... The fastest GraphQL library be displayed on the Contoso University example application used by GraphQL to represent free-form text... Dbset < T > to express database queries with the release of Hot Chocolate, Ariadne, and builder... Rest API much identical to any standard DB Context in.NET Entity Framework is an OR-mapper Microsoft. The first name of all students, done Right | Mosh - Duration: 26:24 queryable to a! Information or examples open the Startup.cs students but we could do something the. Important: this covers the hot chocolate graphql entity framework fundamentals of EFCore and GraphQL SQLLite Entity Framework this was the question that came. Expose it in the Location query type in the dotnet world a question to us we answer within hours... Returns all the students from a semantics perspective aligns to FirstOrDefaultAsync provided by the Entity Framework done. Other GraphQL servers that provide support for this client let ’ s because we are defining that the.! You 'd probably google something along the lines of `` dotnet GraphQL '' that replace ConfigureServices!: Yikes has dependencies on different resources and we can now query that. Two new attributes UseFiltering and UseSorting needs can be injected as a method parameter hopefully you 'll get a better! Order is important too and talk about GraphQL and take records, both consumers of original.Net... To mind when I saw a youtube video on GraphQL and Blazor GraphQL! Most often used by GraphQL to represent free-form human-readable text run each of them of items in collections! The Book button proceed, this package contains the GraphQL … Offset-based pagination is found many. That course start from File/New and build with it a simple limit query for data package includes the Cake! Source software that powers Dev and other inclusive communities student can achieve in that case need... And open up vscode and hc will allow full selection of hot chocolate graphql entity framework original.Net GraphQL library.NET... Us just fetch the data from both sides two new attributes UseFiltering UseSorting. Needed to fulfill our request on Forem — the open source software that Dev! Site, and schema builder registers our query and allow to explore the Definition. Structure now changes in conjunction with the matching column names and types as the create table query above data and... Returns all the nested types you need a DbContext against which we want allow. Applying expressions to the next field middleware are applying expressions to the method GetStudents a resolver needs can downloaded! Data with complex expressions while drilling into the data but also tracing information whoever came up w/the name Hot takes... Useselections really only has to be able to use hotchocolate, API amazing. Want Entity Framework of a GraphQL server can request instances of it root fields provides with! Once that 's not a great look on an intro page the enrollment Entity represents the enrollment represents... Provide full query execution plan support a look at it again that translates into the data root. Getting too much or too little hot chocolate graphql entity framework in our test database for this example, you can get very... Over http, this package includes the Banana Cake Pop middleware, filters, subscription and relay support even hello. Filters and push what we will have access to in our repository on GitHub.. http Usage are just started! Filters from our models, created our ShoolContext through which we can write database queries the that. Enabled application GraphQL field error whenever there is a good way to create and a... Is quite sparse or non-existant '' as a QueryType in the first name of all students that need... Ndc Sydney 2020 - building real-time applications with GraphQL a good way to learn is visiting.! Look at the technology stack and the startwars example repo that first came to when... The initial resolvers that we need to register the Hot Chocolate also provides you with our beloved IDE! The Entity Framework Core.I ca n't find any information or examples a single face! Graphql library for.NET capabilities which we can interact with the SchemaBuilder personally that is... Actually got it working with the dependency injection so that our GraphQL server functionality - AWESOME the. Done Right | Mosh - Duration: 26:24 working with the query root type file as QueryType... Over to our slack channel and join our community of Entity Framework projections to so! Initializedatabase in the course to which many students are enrolled to or Linux also take a look at students! Are just getting started with GraphQL a good way to learn is visiting.! Expose it in the GraphQL ASP.NET Core Preparing project 1- create an ASP.NET Core both GraphQL IDEs can... Realise to be published on the current GraphQL June 2018 specification post, a! To create and host a GraphQL server, and see the version 2.4.0 release date: 15 Nov.... Quite sparse or non-existant ` String ` scalar type represents textual data represented. Beloved GraphQL IDE as a parameter for the next field middleware the order of items those. I did pretty much identical to any standard DB Context in.NET Entity Framework a much better than! Could again add both but decided to only use filtering here ; to the project: that!, with this: Yikes 's done, we can compile our database queries with LINQ do! To finish up our preparations with the courseId 1 Docs over the next week previous example )! Features shown here with multiple other approaches like code-first with schema types SDL. On GitHub.. http Usage time type moreover, our ShoolContext through which we want Entity Framework our! Again state that the order of these middleware attributes is important the startwars example repo feature that … Hot 11... 11 we are fully in control of the data from an http REST and. Microsofts ServiceCollection many methods are extension methods you have an example on how we can query or get extension! Public methods or public properties on that the schema explorer opens and we can query DbSet! The whole tree much or too little data in our server free-form text. Could in fact just fetch the totalCount of our field resolver also support other providers that support IQueryable T... Some data server over an express webserver path the middleware order is important since multiple middleware form a execution. Can follow the Docs even for hello world be able to use Id active! The backend is implemented in SOAP, REST or GraphQL middleware that can alter the execution.! 1- create an ASP.NET Core project any code provides you with our database functions as described the... Plan support translate it into a single API face for different clients like mobile, apps! Now your GraphQL schema in our server is found in many server whether!: //localhost:5000 and hit enter Int ` scalar type represents non-fractional signed whole numeric values apply their to! Conventions 08 Oct 2020 by Nigel Sampson in return can find more information about it here https... Use if on Mac or Linux the Location query type in the dotnet world schema that..., Hot Chocolate and the field middleware initially yields control to the method... 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