How to implement Graphql Connection

[hyzx86]

Hi ，There is a problem here. How can I get a ConnectionType from this instance object:typeType ?

https://github.com/hyzx86/OrchardCore/blob/3ada9539cd5a5774fcc686e4b3d2785de25f2f0e/src/OrchardCore/OrchardCore.ContentManagement.GraphQL/Queries/ContentTypeQuery.cs#L67

I see a similar problem here, but I don't understand how to operate it.
graphql-dotnet/graphql-dotnet#393

[hyzx86]

Associated with this issue #6939

[hyzx86]

now I have changed the code like bellow:

                var typeType = new ContentItemType(_contentOptionsAccessor)
                {
                    Name = typeDefinition.Name,
                    Description = S["Represents a {0}.", typeDefinition.DisplayName]
                }; 
                var query = new ContentItemsFieldType(typeDefinition.Name, schema, _contentOptionsAccessor, _settingsAccessor)
                {
                    Name = typeDefinition.Name,
                    Description = S["Represents a {0}.", typeDefinition.DisplayName],
                    //UNDONE: how to get new ConnectionType from typeType?

                    ResolvedType = new ConnectionType<ContentItemType>()
                    {
                        Name = typeDefinition.Name,
                        Description = S["Represents a {0}.", typeDefinition.DisplayName]                        
                    }
                };

in this file: https://github.com/hyzx86/OrchardCore/blob/3ada9539cd5a5774fcc686e4b3d2785de25f2f0e/src/OrchardCore/OrchardCore.ContentManagement.GraphQL/Queries/ContentTypeQuery.cs

change ContentItemsFieldType.cs:

https://github.com/hyzx86/OrchardCore/blob/3ada9539cd5a5774fcc686e4b3d2785de25f2f0e/src/OrchardCore/OrchardCore.ContentManagement.GraphQL/Queries/ContentItemsFieldType.cs#L47

Edit ContentItemsFieldType.cs：

Type = typeof(ListGraphType<ContentItemType>);
to
Type = typeof(ConnectionType<ContentItemType>);

and
Resolver = new LockedAsyncFieldResolver<Connection<ContentItem>>(Resolve);

edit resolve method

            var totalCount = await contentItemsQuery.CountAsync();
            contentItemsQuery = PageQuery(contentItemsQuery, context, graphContext);

            var contentItems = await contentItemsQuery.ListAsync();

            foreach (var filter in filters)
            {
                contentItems = await filter.PostQueryAsync(contentItems, context);
            }
            //var endCursor = contentItems?.Last()?.ContentItemId;
            //var cursor = contentItems.Count() > 0 ? contentItems.Last()?.ContentItemId : null;
            return new Connection<ContentItem>()
            {
                TotalCount = totalCount,
                Edges = contentItems.Select(x => new Edge<ContentItem> { Cursor = x.ContentItemId, Node = x }).ToList(),
                PageInfo = new PageInfo
                {
                    HasNextPage = totalCount > first + skip,
                    HasPreviousPage = first > 0
                    //UNDONE:what about endCursor and cursor use for ? 
		 			//var endCursor = contentItems?.Last()?.ContentItemId; 
		            //var cursor = contentItems.Count() > 0 ? contentItems.Last()?.ContentItemId : null; 
                }
            };

It worked, but there were still some problems. that is schema cannot query for custom properties

[hyzx86]

[EricBui619]

@hyzx86
The solution right here: graphql-dotnet/graphql-dotnet#393
Just clone the entire ConnectType and EdgeType from GraphQL .Net library and modify constructors to support instance-based resolvedType. I did it and it work well. I think it's the only solution right now