Adding GraphQL content Items property to ListPart

src/OrchardCore.Modules/OrchardCore.Lists/GraphQL/ListQueryObjectType.cs

@@ -0,0 +1,57 @@
+using System.Collections.Generic;
+using GraphQL.Types;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Localization;
+using OrchardCore.Apis.GraphQL;
+using OrchardCore.ContentManagement;
+using OrchardCore.ContentManagement.GraphQL.Queries.Types;
+using OrchardCore.ContentManagement.Records;
+using OrchardCore.Lists.Indexes;
+using OrchardCore.Lists.Models;
+using YesSql;
+
+namespace OrchardCore.Lists.GraphQL
+{
+    public class ListQueryObjectType : ObjectGraphType<ListPart>
+    {
+        public ListQueryObjectType(IStringLocalizer<ListQueryObjectType> T)
+        {
+            Name = "ListPart";
+            Description = T["Represents a collection of content items."];
+
+            Field<ListGraphType<ContentItemInterface>, IEnumerable<ContentItem>>()
+                .Name("contentItems")
+                .Description("the content items")
+                .Argument<IntGraphType, int>("first", "the first n elements (10 by default)", 0)
+                .Argument<IntGraphType, int>("skip", "the number of elements to skip", 0)
+                .ResolveAsync(async g =>
+                {
+                    var context = (GraphQLContext)g.UserContext;
+                    var session = context.ServiceProvider.GetService<ISession>();
+
+                    var query = session.Query<ContentItem>()
+                        .With<ContainedPartIndex>(x => x.ListContentItemId == g.Source.ContentItem.ContentItemId)
+                        .With<ContentItemIndex>(x => x.Published)
+                        .OrderByDescending(x => x.CreatedUtc);
+
+                    // Apply a default limit
+                    var pagedQuery = query.Take(10);
+
+                    var skip = g.GetArgument<int>("skip");
+                    var first = g.GetArgument<int>("first");
+
+                    if (skip > 0)
+                    {
+                        pagedQuery = pagedQuery.Skip(skip);
+                    }
+
+                    if (first > 0)
+                    {
+                        pagedQuery = pagedQuery.Take(first);
+                    }
+
+                    return await query.ListAsync();
+                });
+        }
+    }
+}

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

@@ -13,6 +13,7 @@ public override void ConfigureServices(IServiceCollection services)
         {
             services.AddInputObjectGraphType<ContainedPart, ContainedInputObjectType>();
             services.AddObjectGraphType<ContainedPart, ContainedQueryObjectType>();
+            services.AddObjectGraphType<ListPart, ListQueryObjectType>();
             services.AddTransient<IIndexAliasProvider, ContainedPartIndexAliasProvider>();
         }
     }