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#19 get graphql working via the extension method
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Extensions/DataAccess.Repository.HotChocolate/readme.md
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,116 +1,116 @@ | ||
| # HotChocolate Extension | ||
| ## Introduction | ||
| This extension provides GraphQL query functionality via the [HotChocolate Library](https://chillicream.com/docs/hotchocolate/v13) | ||
| # HotChocolate Extension | ||
| ## Introduction | ||
| This extension provides GraphQL query functionality via the [HotChocolate Library](https://chillicream.com/docs/hotchocolate/v13) | ||
|
|
||
| ## Installation | ||
| 1. You'll need to install and set up the core data access NuGet package (see instructions [here](https://github.com/Ian-Webster/DataAccess#usage)) | ||
| 2. Add the following NuGet packages to your IoC project; | ||
| 1. [HotChocolate](https://www.nuget.org/packages/HotChocolate/13.7.0?_src=template) | ||
| 2. [HotChocolate.AspNetCore](https://www.nuget.org/packages/HotChocolate.AspNetCore/13.7.0?_src=template) | ||
| 3. [HotChocolate.Data](https://www.nuget.org/packages/HotChocolate.Data/13.7.0?_src=template) | ||
| 3. Add the following NuGet packages to your Repository project; | ||
| 1. [HotChocolate](https://www.nuget.org/packages/HotChocolate/13.7.0?_src=template) | ||
| 2. [HotChocolate.Data](https://www.nuget.org/packages/HotChocolate.Data/13.7.0?_src=template) | ||
| 3. TBC- this extension | ||
| 4. Modify your IoC services to add and configure HotChocolate; | ||
| ```csharp | ||
| // set up HotChocolate | ||
| builder.Services.AddGraphQLServer() | ||
| .AddQueryType(q => q.Name("Query")) | ||
| .AddProjections() | ||
| .AddFiltering() | ||
| .AddSorting(); | ||
| ``` | ||
| 5.Modify your middleware configuration to include `app.MapGraphQL();` | ||
| 6. We'll revisit your IoC configuration later to add queries. | ||
| ## Installation | ||
| 1. You'll need to install and set up the core data access NuGet package (see instructions [here](https://github.com/Ian-Webster/DataAccess#usage)) | ||
| 2. Add the following NuGet packages to your IoC project; | ||
| 1. [HotChocolate](https://www.nuget.org/packages/HotChocolate/13.7.0?_src=template) | ||
| 2. [HotChocolate.AspNetCore](https://www.nuget.org/packages/HotChocolate.AspNetCore/13.7.0?_src=template) | ||
| 3. [HotChocolate.Data](https://www.nuget.org/packages/HotChocolate.Data/13.7.0?_src=template) | ||
| 3. Add the following NuGet packages to your Repository project; | ||
| 1. [HotChocolate](https://www.nuget.org/packages/HotChocolate/13.7.0?_src=template) | ||
| 2. [HotChocolate.Data](https://www.nuget.org/packages/HotChocolate.Data/13.7.0?_src=template) | ||
| 3. TBC- this extension | ||
| 4. Modify your IoC services to add and configure HotChocolate; | ||
| ```csharp | ||
| // set up HotChocolate | ||
| builder.Services.AddGraphQLServer() | ||
| .AddQueryType(q => q.Name("Query")) | ||
| .AddProjections() | ||
| .AddFiltering() | ||
| .AddSorting(); | ||
| ``` | ||
| 5.Modify your middleware configuration to include `app.MapGraphQL();` | ||
| 6. We'll revisit your IoC configuration later to add queries. | ||
|
|
||
| ## Building queries | ||
| Queries in GraphQL are like a stand-in for controller endpoints in REST, they provide a public API into your data, you can read more here https://chillicream.com/docs/hotchocolate/v13/defining-a-schema/queries | ||
| ## Building queries | ||
| Queries in GraphQL are like a stand-in for controller endpoints in REST, they provide a public API into your data, you can read more here https://chillicream.com/docs/hotchocolate/v13/defining-a-schema/queries | ||
|
|
||
| HotChocolate can query your DBContext directly should you wish, however it does also provide a number of IQueryable extension methods and a query context class that allow you to use your own services and repository methods to perform the data operations. | ||
| HotChocolate can query your DBContext directly should you wish, however it does also provide a number of IQueryable extension methods and a query context class that allow you to use your own services and repository methods to perform the data operations. | ||
|
|
||
| The purpose of this extension library to obfuscate the complexities involved in modifying repository methods to support the HotChocolate extensions by providing a number of extension methods in the QueryExtensions; | ||
| * GetQueryItem - returns a single entity, supports filtering and projection | ||
| * GetQueryItems - returns a collection of entities, supports filtering, projection and sorting | ||
| * GetPagedQueryItems - returns a [Connection](https://chillicream.com/docs/hotchocolate/v13/fetching-data/pagination/#connections) object provided by the HotChocolate library, supports filtering, projection, sorting and pagination | ||
| The purpose of this extension library to obfuscate the complexities involved in modifying repository methods to support the HotChocolate extensions by providing a number of extension methods in the QueryExtensions; | ||
| * GetQueryItem - returns a single entity, supports filtering and projection | ||
| * GetQueryItems - returns a collection of entities, supports filtering, projection and sorting | ||
| * GetPagedQueryItems - returns a [Connection](https://chillicream.com/docs/hotchocolate/v13/fetching-data/pagination/#connections) object provided by the HotChocolate library, supports filtering, projection, sorting and pagination | ||
|
|
||
| Usage for this extension is as follows; | ||
| 1. Modify your repository to accept IResolverContext and to call the extension, as an example this is how to get a single book entity for GraphQL; | ||
| ```csharp | ||
| // interface | ||
| using HotChocolate.Resolvers; // namespace for IResolverContext | ||
| namespace DataAccess.Example.Data.Repositories; | ||
|
|
||
| public interface IBookRepository | ||
| { | ||
| Task<Book?> GetBookForGraphQuery(IResolverContext context, CancellationToken token); | ||
| } | ||
| Usage for this extension is as follows; | ||
| 1. Modify your repository to accept IResolverContext and to call the extension, as an example this is how to get a single book entity for GraphQL; | ||
| ```csharp | ||
| // interface | ||
| using HotChocolate.Resolvers; // namespace for IResolverContext | ||
| namespace DataAccess.Example.Data.Repositories; | ||
|
|
||
| public interface IBookRepository | ||
| { | ||
| Task<Book?> GetBookForGraphQuery(IResolverContext context, CancellationToken token); | ||
| } | ||
|
|
||
| // implementation | ||
| using DataAccess.Repository.HotChocolate; // namespace for this extension | ||
| using HotChocolate.Resolvers; // namespace for IResolverContext | ||
| namespace DataAccess.Example.Data.Repositories; | ||
|
|
||
| public class BookRepository: IBookRepository | ||
| { | ||
| private readonly IRepository<Book> _bookRepo; | ||
|
|
||
| public BookRepository(RepositoryFactory<LibraryDatabaseContext> repositoryFactory) | ||
| { | ||
| _bookRepo = repositoryFactory.GetRepositoryByType<Book>(); | ||
| } | ||
|
|
||
| public async Task<Book?> GetBookForGraphQuery(IResolverContext context, CancellationToken token) | ||
| { | ||
| return await _bookRepo.GetQueryItem(context, token); | ||
| } | ||
| } | ||
| ``` | ||
| 2. Create a query class here is the book query; | ||
| ```csharp | ||
| using HotChocolate; | ||
| using HotChocolate.Types; | ||
| using HotChocolate.Resolvers; | ||
|
|
||
| namespace DataAccess.Example.Data.Queries; | ||
|
|
||
| [ExtendObjectType("Query")] | ||
| public class BookQuery | ||
| { | ||
| [UseProjection] // enable projecton for this query | ||
| [UseFiltering] // enable filtering for this query | ||
| // [Service] is an attribute hint provided by the HotChocolate library | ||
| // telling the code to use DI to retrieve the IBookRepository dependency | ||
| // IResolverContext and CancellationToken objects are provide as part of the | ||
| // GraphQL context | ||
| public async Task<Book?> GetBook([Service] IBookRepository repository, IResolverContext context, CancellationToken token) | ||
| { | ||
| return await repository.GetBookForGraphQuery(context, token); | ||
| } | ||
| } | ||
| ``` | ||
| 3. Modify the HotChocolate IoC configuration you added earlier to include your query; | ||
| ```csharp | ||
| // set up HotChocolate | ||
| builder.Services.AddGraphQLServer() | ||
| .AddQueryType(q => q.Name("Query")) | ||
| .AddTypeExtension<BookQuery>() // adding the book query type | ||
| .AddProjections() | ||
| .AddFiltering() | ||
| .AddSorting(); | ||
| ``` | ||
| 4. Run the API project as normal, you should be able to visit /graphql and see the [Banana Cake Pop](https://chillicream.com/products/bananacakepop/) UX | ||
| 5. Run a query through the UX, as an example this will return the book "Fight Club" from the example project; | ||
| ```json | ||
| { | ||
| book (where: {bookId: {eq: "2c4a20f5-3fc8-4694-9c03-cb444bf416dc"}}) | ||
| { | ||
| bookId, | ||
| name | ||
| } | ||
| } | ||
| ``` | ||
| // implementation | ||
| using DataAccess.Repository.HotChocolate; // namespace for this extension | ||
| using HotChocolate.Resolvers; // namespace for IResolverContext | ||
| namespace DataAccess.Example.Data.Repositories; | ||
|
|
||
| public class BookRepository: IBookRepository | ||
| { | ||
| private readonly IRepository<Book> _bookRepo; | ||
|
|
||
| public BookRepository(RepositoryFactory<LibraryDatabaseContext> repositoryFactory) | ||
| { | ||
| _bookRepo = repositoryFactory.GetRepositoryByType<Book>(); | ||
| } | ||
|
|
||
| public async Task<Book?> GetBookForGraphQuery(IResolverContext context, CancellationToken token) | ||
| { | ||
| return await _bookRepo.GetQueryItem(context, token); | ||
| } | ||
| } | ||
| ``` | ||
| 2. Create a query class here is the book query; | ||
| ```csharp | ||
| using HotChocolate; | ||
| using HotChocolate.Types; | ||
| using HotChocolate.Resolvers; | ||
|
|
||
| namespace DataAccess.Example.Data.Queries; | ||
|
|
||
| [ExtendObjectType("Query")] | ||
| public class BookQuery | ||
| { | ||
| [UseProjection] // enable projecton for this query | ||
| [UseFiltering] // enable filtering for this query | ||
| // [Service] is an attribute hint provided by the HotChocolate library | ||
| // telling the code to use DI to retrieve the IBookRepository dependency | ||
| // IResolverContext and CancellationToken objects are provide as part of the | ||
| // GraphQL context | ||
| public async Task<Book?> GetBook([Service] IBookRepository repository, IResolverContext context, CancellationToken token) | ||
| { | ||
| return await repository.GetBookForGraphQuery(context, token); | ||
| } | ||
| } | ||
| ``` | ||
| 3. Modify the HotChocolate IoC configuration you added earlier to include your query; | ||
| ```csharp | ||
| // set up HotChocolate | ||
| builder.Services.AddGraphQLServer() | ||
| .AddQueryType(q => q.Name("Query")) | ||
| .AddTypeExtension<BookQuery>() // adding the book query type | ||
| .AddProjections() | ||
| .AddFiltering() | ||
| .AddSorting(); | ||
| ``` | ||
| 4. Run the API project as normal, you should be able to visit /graphql and see the [Banana Cake Pop](https://chillicream.com/products/bananacakepop/) UX | ||
| 5. Run a query through the UX, as an example this will return the book "Fight Club" from the example project; | ||
| ```json | ||
| { | ||
| book (where: {bookId: {eq: "2c4a20f5-3fc8-4694-9c03-cb444bf416dc"}}) | ||
| { | ||
| bookId, | ||
| name | ||
| } | ||
| } | ||
| ``` | ||
|
|
||
| ## Version history | ||
| * 0.1.0 - Initial project creation, getting everything figured out and running locally | ||
| ## Version history | ||
| * 0.1.0 - Initial project creation, getting everything figured out and running locally |