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POBreezejs Uncaught TypeError: Converting circular structure to JSON
 

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    <p>I have an ASP.Net MVC SPA using the Hot Towel template i.e. breezejs, knockout, entity framework (code first), durandal etc.</p> <p>In my EF model I have a class named "Section" that has a self referencing association. Each section belongs to a "Document" and each Section also has a collection of "Items":</p> <pre><code> public class Section : CommonBase { ... public Guid DocumentId { get; set; } public Document Document { get; set; } ... public List&lt;Item&gt; Items { get; set; } public Guid? ParentId { get; set; } public Section Parent { get; set; } public List&lt;Section&gt; Children { get; set; } ... } public class Item : CommonBase { ... public Guid SectionId { get; set; } public Section Section { get; set; } ... } </code></pre> <p>I load the "Sections" and "Items" when I load the documents via a Breeze query and a BreezeController method:</p> <pre><code> var query = breeze.EntityQuery.from(model.entitySets.document) .where(predicate) .expand("sections.items.cloudDriveFile, sections.cloudDriveFile") .orderBy(model.orderByClauses.document); return _contextProvider.Context.Documents.Where(x =&gt; x.OrganisationId == currentUser.OrganisationId); </code></pre> <p>If I edit and save a "Section" without loading any "Items" then all works OK. However when I try to edit and save a section that has "Items" - and I have loaded those "Items" (either using an Include in the BreezeController or an Expand in javascript) - then I get the following error:</p> <p>"Uncaught TypeError: Converting circular structure to JSON "</p> <p>I am saving using a simple call to manager.saveChanges().</p> <p>Is there some technique or pattern that I should be implementing to avoid this circular reference error?</p>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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