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POBreeze.js: adding an element to a navigation property collection without inverse rel raises an exception [Unable to get value of the property 'name']
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  1. POBreeze.js: adding an element to a navigation property collection without inverse rel raises an exception [Unable to get value of the property 'name']
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    copied!<p>I have two entities in my EDM, <code>Application</code> and <code>Address</code> pretty much like the following:</p> <pre><code>class Application { ICollection&lt;Address&gt; Addresses { get; set; } } class Address { } </code></pre> <p>On the client, I create an instance of each and try to add the <code>address</code> instance to the <code>Application.addresses</code> collection:</p> <pre><code>var address = addressType.createEntity(...); var application = applicationType.createEntity(...); application.addresses.push(address); </code></pre> <p>Unfortunately, I get a runtime exception saying: "<code>Unable to get value of the property 'name': object is null or undefined</code>".</p> <p>I tracked the exception back to the <code>checkForDups</code> function in <code>breeze.debug.js@9393-9404</code> (v1.2.8):</p> <pre><code>function checkForDups(relationArray, adds) { // don't allow dups in this array. - also prevents recursion var inverseProp = relationArray.navigationProperty.inverse; var goodAdds = adds.filter(function(a) { if (relationArray._addsInProcess.indexOf(a) &gt;= 0) { return false; } var inverseValue = a.getProperty(inverseProp.name); return inverseValue != relationArray.parentEntity; }); return goodAdds; } </code></pre> <p>As it happens, my entities are in a one-to-many unidirectional relationship (without an inverse navigation property); as a result at runtime <code>relationArray.navigationProperty.inverse</code> is <code>undefined</code> and so the error when trying to access the <code>name</code> property.</p> <p>Adding a simple check fixes the problem, and allows adding to the collection:</p> <pre><code>if (!inverseProp) { return true; } </code></pre> <p>So after all this the question is: is this a bug or is it simply that Breeze does not support one-to-many unidirectional?</p>
 

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