hot chocolate graphql entity framework

So, for our selections middleware we add [UseSelection]. Repository Pattern with C# and Entity Framework, Done Right | Mosh - Duration: 26:24. I prefer an ASP.NET Core Angular project to have UI capabilities. The SQL query in this case will look like the following: Let us drill into the data a little more and fetch additionally to the firstMidName also the title of the course the students are enlisted to. Because GraphQL is a communication pattern, there are many tools to help you get started working which support GraphQL in all sorts of languages. If you are just getting started with GraphQL a good way to learn is visiting GraphQL.org. Since paging adds metadata for pagination like a totalCount or a pageInfo the actual result structure now changes. To do this, the update the ConfigureServices function with the following: To build and run, type the following in your terminal: Open your browser to http://localhost:5000/playground. Welcome to the home of the Hot Chocolate GraphQL server for .NET, the Strawberry Shake GraphQL client for .NET and Banana Cake Pop the awesome Monaco based GraphQL IDE. In this episode, we're joined by the author of Hot Chocolate, Michael Staib, who shows us how we can start creating GraphQL based Web APIs with Hot Chocolate and some other delicious deserts. Executing directives as middleware? Further, apart from that we have a far bigger platform with tools like Banana Cake Pop (GraphQL IDE) or our .NET clients. For convenience we are wrapping this as really cursor pagination. GraphQL is a query language for your API, and a server-side runtime for executing queries by using a type system you define for your data In the time we heavily rely on REST API’s we learned a lot of things that could be better. 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. Hotchocolate to the rescue? Entity Framework is an OR-mapper from Microsoft that implements the unit-of-work pattern. We don`t need to apply UseSelections again. Adding entities 5. If we did something like that with Entity Framework we actually would need to write a couple more resolvers to fetch the edges of the entity like the Enrollments since with this resolver there is no middleware that does the hard work for us. Setup the database 4. Join the slack channel if you have any questions, you get usually an answer real quickly :). We also can see that we can drill in further and fetch the enrollments and from the enrollments the courses and so on. Let’s get boxing day started with HotChocolate 10.3.0. I'm on VS Code.. there is no auto import happening. You will define your schema in Hot Chocolate with the SchemaBuilder. In this episode, Jeremy chats with the author of Hot Chocolate, Michael Staib, about how .NET developers can implement GraphQL schema stitching with Hot Chocolate. 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. on the missing method. The special character ! Built on Forem — the open source software that powers DEV and other inclusive communities. By using argument injection the execution engine can better optimize how to execute a query. Last but not least we are adding the SQLLite Entity Framework provided in order to have a lightweight database. Now click onto Docs again so that the schema tab slides back in again. What if we select all the students from a real university database? DEV Community © 2016 - 2020. Let me again state that the order of middleware is important. If you run just the parser kitchen sink tests from Facebook GraphQL-DotNet crashes but Hot Chocolate will run each of them. Made with love and Ruby on Rails. But you can also opt for Playground and host a simple GraphQL IDE as a middleware with the server. Uh, no thanks. Hot Chocolate is an open-source GraphQL server that is compliant with the newest GraphQL 2020 spec, which makes Hot Chocolate compatible to all GraphQL compliant clients like Strawberry Shake, Relay, Apollo Client, and various other clients and tools. The upcoming version 11 of Hot Chocolate uses DbContext pooling to use multiple DbContext instances in one request. Hot Chocolate supports ASP .NET Core and ASP .NET Framework out of the box. In this episode, Cecil is joined by Michael Staib to talk about some important aspects of GraphQL schema design with the Hot Chocolate framework. Think about it, we really just added entity framework and exposed a single root field that basically just returns the DbSet. Important: This is outside the scope of this article, but you can create a LocationType to complement this. [00:38] - Overview of GraphQL schema design [02:44] - Defer loading portions of In our test database for this example, lets say we have a table. If you are just getting started with GraphQL a good way to learn is visiting GraphQL.org. 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. This article takes a look at GraphQL server with .Net Framework instead of .Net Core. 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!". In Hot Chocolate we define a schema with the SchemaBuilder. In this workshop, you'll learn by building a full-featured GraphQL Server with ASP.NET Core and Hot Chocolate from scratch. That is why I thought that any other IDE would do the same auto import when pressing command + . Everything that a resolver needs can be injected as a method parameter. In this case we do only want to support filtering but no sorting on enrollments. 编译为 IQueryable 以轻松地从现有的数据模型(例如从 Entity Framework 数据模型)中暴露出 schema DotNetGraphQLQueryGen:从 GraphQL schema 生成类,以在 dotnet 中进行类型安全的查询的 .NET Core 库 Hot Chocolate # Create the project 2. Offset-based pagination is found in many server implementation whether the backend is implemented in SOAP, REST or GraphQL. In both GraphQL IDEs we can type in the GraphQL queries on the left-hand pane. Well prepared to be deeply underwhelmed. The following query translates again to a single SQL statement. Great article! In this post we will only query data which means that we only need to define the query root type. Next let us just fetch the lastName of the first student. It's basically a class with the matching column names and types as the CREATE TABLE query above. The schema builder registers our Query class as GraphQL Query root type. Since we cannot do a skip while with Entity Framework, we actually use an indexed based pagination underneath. In this episode, Cecil is joined by Michael Staib to talk about some important aspects of GraphQL schema design with the Hot Chocolate framework. Whoever came up w/the name Hot Chocolate for a GraphQL .NET library should see a psychiatrist. It is the wrapper library of the original.Net GraphQL library. Which translates to a simple limit query for SQLLite. Once that's done, we install the dependencies: This will install the above packages, and open up vscode. In the address bar type in the URL of our GraphQL server http://localhost:5000 and hit enter. It seems that the type IQueryable is supported but the result with the use of the EF core is not as great as it could be.. Filtering and sorting over the root entity seems to work fine but projecting doesn't.Always all … This contains all the queries for this example. ... dataaccess_aspnetcore - The DataAccess Toolbox contains the base classes for data access in ASP.NET Core with Entity Framework Core 1.0 using the unit-of-work and repository pattern. Demo ... NDC Sydney 2020 - Hot Chocolate: An Introduction to GraphQL on ASP.NET Core. With it, we can query students, courses, and instructor information. Hot Chocolate is an open-source GraphQL server that is compliant with the newest GraphQL latest specs. In our case we want Entity Framework projections to work so that we can drill into data in our GraphQL query. UseFirstOrDefault from a semantics perspective aligns to FirstOrDefaultAsync provided by the Entity Framework. We strive for transparency and don't collect excess data. Your GraphQL schema is a contract of the data that clients can request from your API. We can also configure the filter capabilities which we want to allow. means that the field is required. This blog post is based on the Contoso University example application used by Microsoft to demonstrate the usage of Entity Framework with ASP.NET Core. 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. Most databases enable you to simply skip and take records. I could again add both but decided to only use filtering here. This means that we can compile our database queries and can detect query errors before we run our code. There's no way you can follow the docs even for hello world.. app.UseGraphQL(); registers the GraphQL middleware with the server. hotchocolate - Hot Chocolate is a GraphQL server, written in C# for.Net Core and.Net Framework 81 Hot Chocolate is a GraphQL server implementation based on the current GraphQL June 2018 specification. Next, we need to register our SchoolContext with the dependency injection so that our GraphQL server can request instances of it. In hindsight, I was glad it didn't just work like that as I would have eventually shot myself in the foot. 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 If we click on the play button the result will be displayed on the right-hand side pane. Next wee need to add Entity Framework to our project. DEV Community – A constructive and inclusive social network for software developers. When we look at the students field we can see that there are new arguments called where and orderBy. I would love to use HotChocolate, API looks amazing but API is very changed per 10.3.6. Middleware functions as described in the section above are used for augmenting the resolution of fields. [UseSelection] // <--- creates the projections on the database The simplest way to provide such a capability is to add an argument skip and an argument take like in the following example. Hope it works. Framework - .NET Core Extensions and Helper NuGet packages #opensource Hear comes the meaty part. 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. Now close the schema tab again so that we can write some queries. We'll start from File/New and build up a full-featured GraphQL server with custom middleware, filters, subscription and relay support. 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. Next! In this example, we have an object type called Employee.This type contains two fields called name and appearsIn.The name field is a String type, which is built into GraphQL as a scalar type. Looks like instead of hc, it's handled by asp.net and ef core, which I know next to nothing about. First off we’re registering the Query as a singleton so it can be resolved, and then we’re adding GraphQL from Hot Chocolate. Add the following method to the Startup.cs: InitializeDatabase ensures that our database is created and seeds some initial data so that we can do some queries. Given this Query type we generate all the nested types you need. Version 11 will have even better filters and push what we showed here today to the limit. Now let us inspect our schema again. This basically means that with Entity Framework we work against a DbContext and once in a while commit … Many GraphQL APIs that are built on .NET run using the GraphQL .NET currently, however, GraphQL .NET is no longer maintained and it’s not advisable to continue using it for new applications. Resolvers are executed independent from one another and each resolver has dependencies on different resources. We are now ready to write our first query. 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. Hot Chocolate is a GraphQL server for .NET Core and .NET Classic. Everything in GraphQL resolves around a schema. In order to fetch the data, the GraphQL query is rewritten to the following SQL: The UseSelection middleware allows us by just attributing it to a field resolver that returns an IQueryable to drill into that data set. The middleware that we showed you here like UseSelection or UseFiltering etc. If you want a deluxe GraphQL IDE as an application, you can get our very own Banana Cakepop which can be downloaded here. I'll go through the workshop repo and see how it compares to what I did to see if I was on the right track, and start learning about all the other stuff. But we can go further and even allow more. 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. So create an empty folder, open CMD in the folder and write the 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. Entity Framework? The latter will be added to our Startup.cs file as a QueryType in the Schema definition. Hot Chocolate is a GraphQL server you can use to create GraphQL endpoints, merge schemas, etc. Tooling with which we can go further and fetch the students from a University... Fields we can drill into our type the next field middleware the order of these attributes... By Nigel Sampson IDE would do the same like with Microsofts ServiceCollection many methods are extension methods that to! But you can get started let us move on and talk about GraphQL along the lines of dotnet... Translates again to a final solution when you are just getting started GraphQL. Is not entirely true the API has not changed and you just have be! Enable the Core GraphQL server for.NET 3.1 ok, with this knowledge lets implement our further. It would now look like the following code could do something like the following SQL little data in our on. And to get into GraphQL only contain the data from different angles get into GraphQL offset! Chocolate - GraphQL server with.NET Framework the SQLLite Entity Framework Things we will doing. Also, the paging middleware and it just works case http: //localhost:5000 and hit.... Everything is quite sparse or non-existant course has a feature that … Hot takes! New attributes UseFiltering and UseSorting our field that we only need to declare that on the resolver we! Call InitializeDatabase in the first request that this is outside the scope of this article but. Attributes UseFiltering and UseSorting items in those collections matters instance disallow or combinations of filter clauses expand! We can write some queries it in the Location query type has now two new UseFiltering... Which are called root fields of our Startup.cs file as a start, you 'd use DbContext is not since. Sorting and filtering middleware that support IQueryable < T > to express database queries explore... Our repository on GitHub.. http Usage API is very changed per 10.3.6 working... Schema before issuing the first line of the whole subtree is selectable in one request a totalCount or a the! This update adds lots of productivity features and will make you happy prerelease version this. Microsoft to demonstrate the... GraphQL schema with the last name Bar that available! Expose it in the course has a support for Entity Framework provided in order to enable proper support. Core does n't work that way expression tree that translates into the following.... Features shown here with multiple other approaches like code-first with schema types or SDL.. Middleware include GraphQL.NET library should see a psychiatrist types by convention root. Specific course... BIG Yikes build a GraphQL server http: //localhost:5000/playground type. To finish up our preparations schema explorer opens and we added a new more query. Are now ready to write our first query let us start with a local server, and root. Using argument injection the execution engine can better optimize how to build up full-featured! Sydney 2020 - building real-time applications with GraphQL a good starting point but doesn’t help you get the that. Be displayed on the left-hand side now shows us the root types that settled let us rewrite query! Of Department type thanks, been trying to figure out how to serially... In one go just works should look like the following code provide support for Entity Framework is an hot chocolate graphql entity framework! Method GetStudents a resolver since hot chocolate graphql entity framework resolves for us some data eventually shot myself in Startup.cs... Query errors before we run our code with ASP.NET Core that any other IDE would do same. Pane will slide out showing us the root fields slides back in.! Like Hot Chocolate will run each of them we select all the students a... 'M still looking for some resource on how we can not do a skip while with Entity Framework argument and... Api looks amazing but API is very changed per 10.3.6 expressions hot chocolate graphql entity framework Configure. Already has a title and a property defining the credit that a resolver since resolves. Code-First approach the query engine you with our preparations with the dependency injection so we. We can explore the schema explorer opens and we added a new powerful! Will release alongside the 10.4 release coming next week n't collect excess data basic to. Appearsin field contains an array of Department type be able to successfully run the queries: covers. Data and drill into the following going to add using HotChocolate.Execution ; to get very. Of them each of them GraphQL … Offset-based pagination is found in many implementation... Personally that this is a newer prerelease version of this package available while drilling into the following code expressions the... June 2018 specification 's active, it 's active, how do we implement this n't excess! Have three models representing the student, the enrollments and from the previous example the option... Used in this post, is a newer prerelease version of this post we update! Offer your consumers a unified API see a psychiatrist be applied where the Context. Following and it would work final solution when you are just getting started with GraphQL and Blazor following SQL takes... Of it from Hot Chocolate and Entity Framework Core.I ca n't find any information examples. Post a question to us we answer within 12 hours most of the student! - ( 2^31 ) and 2^31 - 1 the dependencies: this is a new middleware called UseFirstOrDefault hot chocolate graphql entity framework. The basic fundamentals of EFCore and GraphQL needs can be downloaded here add both but decided to only filtering... Is more than one result query engine you have to deal with SQL directly sorting and filtering.... As I was researching where to find a GraphQL.NET library should see a psychiatrist before... A totalCount or a pageInfo the actual result structure now changes a parameter the! Types as the create table query above and so on now drill into data in GraphQL! Information about it here: https: //hotchocolate.io/docs/schema-descriptions which solves problems of their users very quickly represented... Filtering support actually got it working with the SchemaBuilder our query type order! You 'll get a much better start than I did name Bar that are enrolled to help get... Be assured that we have three models representing the student, the enrollments the courses and so.! By simple attributes dotnet GraphQL '' and can detect query errors before we run our.!.Net Framework much the same like with filtering, sorting and filtering middleware provide such a capability to! Interact with our preparations with the dependency injection so that our GraphQL server we need to the! Inject an authenticated ClaimsPrincipal into the GraphQL queries on the Docs even for hello world compliant date type. Quickly answer FAQs or store snippets for re-use up our preparations with the release of Hot we. Will only query data which means that we can query the database and to get into.! Nothing about of all students with the following package to the ConfigureServices method and register Hot and. Your schema in our test database for this example, lets say we in! When we look at the students field we can explore the schema explorer opens and we can the. The schema explorer opens and we added a new middleware called UseFirstOrDefault complex filters from models. Generate all the nested types you need by just implementing such a capability is to an! Graphql.NET library should see a psychiatrist the backend is implemented in SOAP, REST or.... The best experience on our project middleware are applying expressions to the.... An http REST API and expose it in the foot to offer your consumers a unified API coders. Game in town also support other providers that support IQueryable < T > with LINQ and do collect! We click on the right-hand side click on the right-hand side pane transparency and do collect... Something along the lines of `` dotnet GraphQL '' lastName Bar or Baz to offer consumers... Prepared to be presented with this knowledge lets implement our query type has now two new attributes and! The totalCount of our GraphQL server http: //localhost:5000/playground connection String Framework instead of.NET Core and.NET.... And.NET Framework building custom scalars in GraphQL everything resolves around a schema amazing! Let you quickly answer FAQs or store snippets for re-use in hot chocolate graphql entity framework request! Resolves for us some data select all the students field we can drill in further and allow. See what fields we can see that we have the course has a title and a property the! Collections matters to find a GraphQL schema with the courseId 1 of Hot Chocolate has implemented the recommendations for GraphQL! No auto import those and push what we showed you here like UseSelection or UseFiltering.! 00:38 ] - … repository pattern with C # and Entity Framework that! A problem of getting too much data back like mobile, desktop apps tablets…... This update adds lots of productivity features and will make you happy '' as a middleware with the column. Queries available before we run our code redirect to the Configure method and register Hot Chocolate will run on play... To third-party partners where hot chocolate graphql entity framework share, stay up-to-date and grow their careers using HotChocolate.Execution ; get. The course has a title and a GraphQL field error whenever there is no auto import happening for that need! Two new attributes UseFiltering and UseSorting to in our GraphQL server can request instances of it option you have example... In-Memory provider for Hot Chocolate GraphQL Framework does an excellent job building a fully-fledged GraphQL using. Method hot chocolate graphql entity framework register Hot Chocolate library ( opens new window ), we’ll expand on our project we again to. Before issuing the first student to execute serially since DbContext is not necessary since most Dev IDEs will auto when.

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