Programmatically add a reference between two content items

dennisdoomen · September 16, 2021, 8:02am

I have a workitem schema and a riskassessment schema with a bidirectional reference association. I’ve written a custom command handler that will detect that a user has added an instance of the risk assessment to the work item, and will add a reference from the risk assessment back to the work item. The code gets executed and no exceptions are being thrown, but the reference does not seem to be added when I open up the risk assessment content item in the UI. Am I doing something wrong?

See https://github.com/dennisdoomen/squidex/blob/Pilot/backend/Enablon.Extensions/ConnectRiskAssessmentToParentWorkItem.cs#L70

Sebastian · September 16, 2021, 11:11am

I have to debug through it. It looks okay, but I would not change the data, it is not thread safe. It is better to create a clone first.

dennisdoomen · September 16, 2021, 12:40pm

I’ll try cloning the Data properties when building a new command.

Sebastian · September 17, 2021, 2:48pm

Hi,

I simplified the example a little bit for my test and this works:

github.com

Squidex/squidex/blob/master/backend/extensions/Squidex.Extensions/Samples/Middleware/DoubleLinkedContentMiddleware.cs

// ==========================================================================
//  Squidex Headless CMS
// ==========================================================================
//  Copyright (c) Squidex UG (haftungsbeschraenkt)
//  All rights reserved. Licensed under the MIT license.
// ==========================================================================

using System.Linq;
using System.Threading.Tasks;
using Squidex.Domain.Apps.Core.Contents;
using Squidex.Domain.Apps.Entities.Contents;
using Squidex.Domain.Apps.Entities.Contents.Commands;
using Squidex.Infrastructure;
using Squidex.Infrastructure.Commands;
using Squidex.Infrastructure.Json.Objects;

namespace Squidex.Extensions.Samples.Middleware
{
    public sealed class DoubleLinkedContentMiddleware : ICustomCommandMiddleware
    {

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dennisdoomen · September 17, 2021, 7:52pm

Awesome. I’ll try that after the weekend and let you know whether I managed to get it to work as well.

dennisdoomen · September 21, 2021, 9:21am

I have it working now. Thanks for all your work. I’ve also refactored it significantly to demonstrate to my colleagues how you can encapsulate the content into something that looks a bit more like a domain. See https://github.com/dennisdoomen/squidex/blob/pilot/backend/Enablon.Extensions/Domain/WorkItemAggregate/ConnectRiskAssessmentToParentWorkItemCommandMiddleware.cs#L39