Add GraphQL support to UserPickerField

src/OrchardCore.Modules/OrchardCore.ContentFields/GraphQL/Startup.cs

@@ -19,6 +19,7 @@ public override void ConfigureServices(IServiceCollection services)
             services.AddObjectGraphType<LinkField, LinkFieldQueryObjectType>();
             services.AddObjectGraphType<HtmlField, HtmlFieldQueryObjectType>();
             services.AddObjectGraphType<ContentPickerField, ContentPickerFieldQueryObjectType>();
+            services.AddObjectGraphType<UserPickerField, UserPickerFieldQueryObjectType>();
         }
     }
 }

src/OrchardCore.Modules/OrchardCore.ContentFields/GraphQL/Types/UserPickerFieldQueryObjectType.cs

@@ -0,0 +1,64 @@
+using System.Collections.Generic;
+using System.Linq;
+using GraphQL;
+using GraphQL.DataLoader;
+using GraphQL.Types;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Localization;
+using OrchardCore.Apis.GraphQL;
+using OrchardCore.ContentFields.Fields;
+using OrchardCore.ContentManagement;
+using OrchardCore.Users.GraphQL;
+using OrchardCore.Users.Indexes;
+using OrchardCore.Users.Models;
+using YesSql;
+using YesSql.Services;
+
+namespace OrchardCore.ContentFields.GraphQL
+{
+    public class UserPickerFieldQueryObjectType : ObjectGraphType<UserPickerField>
+    {
+        public UserPickerFieldQueryObjectType(IStringLocalizer<UserPickerFieldQueryObjectType> S)
+        {
+            Name = nameof(UserPickerField);
+
+            Field<ListGraphType<StringGraphType>, IEnumerable<string>>("userIds")
+                .Description(S["user ids"])
+                .PagingArguments()
+                .Resolve(resolve =>
+                {
+                    return resolve.Page(resolve.Source.UserIds);
+                });
+
+            Field<ListGraphType<UserType>, IEnumerable<User>>("users")
+                .Description(S["the user items"])
+                .PagingArguments()
+                .ResolveAsync(resolve =>
+                {
+                    var userLoader = GetOrAddUserProfileByIdDataLoader(resolve);
+                    return userLoader.LoadAsync(resolve.Page(resolve.Source.UserIds)).Then(itemResultSet =>
+                    {
+                        return itemResultSet.SelectMany(users => users);
+                    });
+                });
+        }
+
+        private static IDataLoader<string, IEnumerable<User>> GetOrAddUserProfileByIdDataLoader<T>(IResolveFieldContext<T> context)
+        {
+            var dataLoaderContextAccessor = context.RequestServices.GetRequiredService<IDataLoaderContextAccessor>();
+
+            return dataLoaderContextAccessor.Context.GetOrAddCollectionBatchLoader("GetOrAddUserByIds", async (IEnumerable<string> userIds) =>
+            {
+                if (userIds == null || !userIds.Any())
+                {
+                    return default;
+                }
+
+                var session = context.RequestServices.GetService<ISession>();
+                var users = await session.Query<User, UserIndex>(user => user.UserId.IsIn(userIds)).ListAsync();
+
+                return users.ToLookup(user => user.UserId);
+            });
+        }
+    }
+}

src/OrchardCore.Modules/OrchardCore.ContentFields/OrchardCore.ContentFields.csproj

@@ -33,6 +33,7 @@
     <ProjectReference Include="..\..\OrchardCore\OrchardCore.Shortcodes.Abstractions\OrchardCore.Shortcodes.Abstractions.csproj" />
     <ProjectReference Include="..\..\OrchardCore\OrchardCore.ResourceManagement\OrchardCore.ResourceManagement.csproj" />
     <ProjectReference Include="..\..\OrchardCore\OrchardCore.Users.Core\OrchardCore.Users.Core.csproj" />
+    <ProjectReference Include="..\OrchardCore.Users\OrchardCore.Users.csproj" />
   </ItemGroup>
 
 </Project>