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POImplementing PATCH with Delta<T> with JSON Formatter
 

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    <p>I have installed the OData library, but only to gain access to Delta for making PATCH usable for WebAPI. It is kinda working, but not for types like decimal and int. I understand this is due to the JSON Formatter, and not specifically Delta but is there a workaround or a fix (or workaround) that can be applied to this to get it to work. </p> <p>I know Delta was made to work with OData (and the formatter), but without something like Delta using PATCH without Delta become a difficult thing to implement, when you are allowing partial updates of a resource and do not restrict the fields that can be passed.</p> <p>Is there an alternative out there?</p> <p><strong>Related Question - have the same issue, int/decimal etc. don't update</strong></p> <p><a href="https://stackoverflow.com/questions/15561874/deltat-in-patch-actions-not-tracking-primitive-types">Delta&lt;T&gt; in PATCH actions not tracking primitive types</a></p> <p><strong>UPDATED TO INCLUDE SOME CODE FOR CONTEXT</strong></p> <p>The POST/PATCH/PUT Types will be simplified to specific DTOs so that i can reduce the noise of the objects but for now i am using my Model objects directly as i was just trying ot get it working.</p> <p><strong>PATCH Route</strong></p> <pre><code> public HttpResponseMessage Patch(int id, Delta&lt;Measurement&gt; measurement) { var resp = new HttpResponseMessage(HttpStatusCode.OK); var dbMeasurement = (from n in _repo.Include("SurveyItem") where n.Id == id select n).SingleOrDefault(); measurement.Patch(dbMeasurement); _uow.Commit(); var measurementRep = dbMeasurement.ToRepresentation&lt;Measurement, MeasurementRepresentation&gt;(); resp.Content = new ObjectContent&lt;MeasurementRepresentation&gt;(measurementRep, new JsonHalMediaTypeFormatter()); return resp; } </code></pre> <p><strong>FIDDLER POST OPTIONS</strong></p> <p><em>Headers</em></p> <pre><code>User-Agent: Fiddler Host: localhost:1996 Content-Length: 25 Content-Type: application/json </code></pre> <p><em>Body</em></p> <pre><code>{ "Value":101.00 } </code></pre> <p>a 200 is returned but nothing is updated.but what is more telling is the following, value is 0:</p> <p><img src="https://i.stack.imgur.com/Twx9k.png" alt="Delta"></p> <p>I can persist strings, just no other types.</p>
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    1. COWhat version of the OData package are you using? I can successfully patch integers with the 5.0 beta 2 (confirmed) and 4.0.30506 (recollection, quite sure though).
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    2. CO5.0 Beta 2.... i can patch, but it seems strings only, int, decimal etc do not get patched. I am using the JSON formatter, are you using the same?
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    3. COI am, actually. What happens if you check the validity of the ModelState in the PATCH method? Does it get rejected if you try to patch non-strings?
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