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POBreeze.js: how to transform a Breeze entity to a plain JSON object
 

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  1. POBreeze.js: how to transform a Breeze entity to a plain JSON object
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    <p>I have an entity instance created using the metadata coming from the server:</p> <pre><code>breeze.NamingConvention.camelCase.setAsDefault(); ... var applicationType = metadataStore.getEntityType('Application'); var application = applicationType.createEntity(); </code></pre> <p>None of the objects in this particular model has circular dependencies.</p> <p>After the user has made some changes to the corresponding object, I need to perform some custom validation on that entity, so I need to convert that object back to its JSON simple form and send it back to a validation Controller (ASP.NET MVC4).</p> <p>The question is how to transform the entity to JSON such that:</p> <ol> <li>The resulting object reflects the naming conventions used in the server side.</li> <li>The object contains simple properties and not knockout observables.</li> <li>And does not contain any other additional property or function used internally by breeze.</li> </ol> <p>I was expecting to find something like:</p> <pre><code>var json = application.toJS(); </code></pre> <p>But such method does not exist. Using ko.toJS(application) also doesn't work because (1), (2) and (3) are not fulfilled.</p> <p>I'm sure this should be trivially easy to do, but I just can't find anything even remotely related on the documentation.</p> <p>UPDATE: You'll forgive me for the horrible hack, but because I'm in a hurry what I did that temporarily solved my problem was just exposing the <code>unwrapEntities</code> internal function of <code>entityManager</code>. I also changed the function definition a little bit (just to exclude that annoying <code>entityAspect</code>):</p> <pre><code>function unwrapEntities(entities, metadataStore, includeEntityAspect) { var rawEntities = entities.map(function(e) { var rawEntity = unwrapInstance(e); if (includeEntityAspect !== undefined &amp;&amp; includeEntityAspect === false) { return rawEntity; } ... }); } </code></pre> <p>And because I have the <code>entityManager</code> available at all times in my services, I was able to extend my types definition to do something like the following:</p> <pre><code>function createApplicant(initialValues) { var applicant = applicantType.createEntity(initialValues); applicant.toJS = function () { var unwrappedEntities = entityManager.unwrapEntities([applicant], entityManager.metadataStore, false); return unwrappedEntities[0]; }; return applicant; } </code></pre> <p>And that's precisely what I need:</p> <pre><code>var json = application.toJS(); </code></pre>
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