GraphQL.Relay 0.9.1

.NET Standard 2.0
dotnet add package GraphQL.Relay --version 0.9.1
NuGet\Install-Package GraphQL.Relay -Version 0.9.1
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="GraphQL.Relay" Version="0.9.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add GraphQL.Relay --version 0.9.1
#r "nuget: GraphQL.Relay, 0.9.1"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install GraphQL.Relay as a Cake Addin
#addin nuget:?package=GraphQL.Relay&version=0.9.1

// Install GraphQL.Relay as a Cake Tool
#tool nuget:?package=GraphQL.Relay&version=0.9.1

GraphQL.Relay

License

CodeQL analysis

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A collection of classes, tools, and utilities for creating Relay.js compatible GraphQL servers in dotnet.

Provides the following packages:

Package Downloads NuGet Latest
GraphQL.Relay Nuget Nuget

Usage

Setup

Add the Nuget package:

$> dotnet add package GraphQL.Relay

Ensure your resolver for GraphQL can resolve:

  • ConnectionType<>
  • EdgeType<>
  • NodeInterface
  • PageInfoType

If you're using the resolver from MVC (IServiceProvider), that might look like this:

services.AddTransient(typeof(ConnectionType<>));
services.AddTransient(typeof(EdgeType<>));
services.AddTransient<NodeInterface>();
services.AddTransient<PageInfoType>();

GraphTypes

Included are a few GraphQL types and helpers for creating Connections, Mutations, and Nodes

QueryGraphType

A top level Schema query type, which defines the required node root query;

public class StarWarsQuery : QueryGraphType
{
  public StarWarsQuery() {
    Field<DroidType>(
      "hero",
      resolve: context => new Droid { DroidId = "1", Name = "R2-D2" }
    );
  }
}

public class StarWarsSchema : Schema
{
  public StarWarsSchema() {
    Query = new StarWarsQuery();
  }
}
NodeGraphType<TSource, TOut>, NodeGraphType<TSource>, NodeGraphType

NodeTypes, are ObjectGraphTypes that implement the NodeInterface and provide a GetById method, which allows Relay (via the node() Query) to refetch nodes when it needs to.

Nodes, also provide a convenient Id() method for defining global id fields, derived from the type Name and Id. If your underlying type has a name conflict on the field id, the "local" Id will be prefixed with the type name, e.g. Droid.Id -> droidId

public class Droid
{
  public string DroidId { get; set; }
  public string Name { get; set; }
}

public class DroidType : NodeGraphType<Droid>
{
  public DroidType()
  {
    Name = "Droid";

    Id(d => d.DroidId); // adds an id Field as well as the `Droid` id field

    Field<StringGraphType>("name", "The name of the droid.");
  }

  public override Droid GetById(string droidId) {
    return StarWarsData.GetDroidByIdAsync(droidId);
  }
}
Mutations

Relay mutations specify a few constraints on top of the general GraphQL mutations. To accommodate this, there are mutation specific GraphTypes provided.

MutationGraphType

The top level mutation type attached to the GraphQL Schema

public class StarWarsMutation : MutationGraphType
{
  public StarWarsMutation() {

    Mutation<CreateDroidInput, CreateDroidPayload>("createDroid");
    Mutation<DeleteDroidInput, DeleteDroidPayload>("deleteDroid");
  }
}

public class StarWarsSchema : Schema
{
  public StarWarsSchema() {
    Query = new StarWarsQuery();
    Mutation = new StarWarsMutation();
  }
}
MutationInputGraphType

An simple base class that defines a clientMutationId field. functionally identical to InputObjectGraphType otherwise

MutationPayloadGraphType<TSource, TOut>, MutationPayloadGraphType<TSource>, MutationPayloadGraphType

The output ObjectGraphType containing the mutation payload, functionally similar to an ObjectGraphType with the addition of requiring a MutateAndGetPayload() method used to resolve the payload from the inputs.

public class CreateDroidPayload : MutationPayloadGraphType<DroidPayload, Task<DroidPayload>>
{
  public CreateDroidPayload()
  {
    Name = "CreateDroidPayload";

    Field(
      name: "droid",
      type: typeof(Droid));
  }

  public override async Task<DroidPayload> MutateAndGetPayload(MutationInputs inputs)
  {
    string name = inputs.Get<string>("name");

    Droid newDroid = await StarWarsData.CreateDroidAsync(name)

    return new DroidPayload {
      Droid = newDroid
    };
  }
}

Connections

Luckily GraphQL-dotnet already provides helpful utilities for creating connection fields, on GraphTypes. In addition included here are a few more helpful methods for creating relay compatible Connections from IEnumerables.

Connection.ToConnection(IEnumerable items, ResolveConnectionContext context)

Creates a connection from an existing list of objects.

public class Droid
{
  public string DroidId { get; set; }
  public string Name { get; set; }
  public IEnumerable<Droid> Friends { get; set; }
}

public class DroidType : ObjectGraphType<Droid>
{
  public DroidType()
  {
    Name = "Droid";

    Field<StringGraphType>("name", "The name of the droid.");

    Connection<DroidType>()
      .Name("friends")
      .Resolve(context =>
        ConnectionUtils.ToConnection(c.Source.Friends, context));
  }
}
ConnectionUtils.ToConnection(IEnumerable items, ResolveConnectionContext context, int sliceStartIndex, int totalCount)

Similar to the above, but creates a connection with the correct cursors, when you only have a slice of the entire set of items. Windowing the items based on the arguments.

ConnectionUtils.CursorToOffset(string cursor)

Convert a connection item cursor to the int index of the item in the set.

ConnectionUtils.OffsetToCursor(int offset)

Convert an index offset to a connection cursor.

ResolveConnectionContextExtensions.ToConnection<TSource>(this IResolveConnectionContext context, IQueryable<TSource> items)

Creates a connection from an IQueryable.

public class Droid
{
  public string DroidId { get; set; }
  public string Name { get; set; }
  public IQueryable<Droid> Friends { get; set; }
}

public class DroidType : ObjectGraphType<Droid>
{
  public DroidType()
  {
    Name = "Droid";

    Field<StringGraphType>("name", "The name of the droid.");

    Connection<DroidType>()
      .Name("friends")
      .Resolve(context => context
        .ToConnection(c.Source.Friends));
  }
}
Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.
  • .NETStandard 2.0

NuGet packages (4)

Showing the top 4 NuGet packages that depend on GraphQL.Relay:

Package Downloads
VirtoCommerce.ExperienceApiModule.Core

Experiene API functionality

VirtoCommerce.Exp.ExtensionSamples

Package Description

EPiGraphQL.Api

Plug and play EPiServer GraphQL service

Graphify.EPiServer.Api

Plug and play EPiServer GraphQL service

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last updated
0.9.1 6,043 10/11/2022
0.9.0 537 10/7/2022
0.8.0 12,112 7/1/2022
0.7.0 442 6/27/2022
0.6.2 219,816 7/20/2021
0.5.0 366,488 11/13/2017
0.5.0-alpha.0 702 4/15/2018
0.4.1 4,680 1/10/2017
0.4.0 934 1/9/2017
0.3.0 910 1/9/2017
0.2.0 1,006 1/2/2017
0.1.0-beta4 774 12/20/2016
0.1.0-beta3 778 12/12/2016
0.1.0-beta2 757 12/12/2016
0.1.0-beta1 774 11/25/2016