Скачать или смотреть How to Limit Depth of Items in Sitecore JSS Linked Fields

Learn how to effectively limit the depth of items retrieved in linked fields in Sitecore JSS, preventing infinite loops in your applications.
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This video is based on the question https://stackoverflow.com/q/67549711/ asked by the user 'Jaime Escobar' ( https://stackoverflow.com/u/15473079/ ) and on the answer https://stackoverflow.com/a/67690823/ provided by the user 'Jaime Escobar' ( https://stackoverflow.com/u/15473079/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

When developing applications using Sitecore JSS, you might encounter a challenge when working with multilist fields. Specifically, you may have a situation where App Route A includes a multilist that links to App Route B, which, in turn, contains a multilist linking back to App Route A. This circular referencing can lead to infinite loops and overwhelming data retrieval.

In this guide, we’ll explore how you can set the depth of items retrieved to prevent this issue and keep your application running smoothly.

Understanding the Problem

To illustrate the problem, let’s look at the following example:

App Route A:

Has a multilist field linking to App Route B.

App Route B:

Has a multilist field that can link back to App Route A.

This setup potentially creates a loop:

[[See Video to Reveal this Text or Code Snippet]]

When fetching the fields for App Route A, the system may continue retrieving links endlessly until it exceeds resource limits or causes crashes. To address this, we can limit the depth of these serialized items.

Solution Overview

Option 1: Configuration File Patch

The first solution is to create a patch for the configuration file. This approach will change the serializationMaxDepth globally, impacting all items across your Sitecore instance.

Steps:

Open your Sitecore configuration files.

Add the following XML snippet to set the serializationMaxDepth to 2:

[[See Video to Reveal this Text or Code Snippet]]

By setting the depth to 2, you effectively limit the serialization to one level down from the current item, preventing infinite loops in most cases.

Option 2: Custom Field Serialization Resolver

For a more tailored solution, you can create a custom field serialization resolver. This method allows you to maintain flexibility while limiting depth only for specific fields rather than applying a global change.

Create a Custom Field Serializer

You will need to create a new class that extends BaseFieldSerializer:

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Set Up the Field Resolver

Next, implement the resolver using another class that inherits from BaseGetFieldSerializer:

[[See Video to Reveal this Text or Code Snippet]]

Configure the Serializer in Configuration Patch

Finally, adjust your Sitecore configuration to set your custom serializer:

[[See Video to Reveal this Text or Code Snippet]]

Make sure your custom configuration is placed before the default serialization configuration for the multilist field to take effect properly.

Conclusion

By implementing either the global configuration patch or the custom field serialization resolver, you can effectively limit the depth of items retrieved in linked fields, circumventing potential infinite loops in your Sitecore JSS applications. Choose the solution that best meets your needs, either for overall settings or specific field adjustments.

Feel free to reach out if you face any challenges or have questions while integrating these solutions!