A tip: Updating Data in SharePoint 2010 using REST API

Posted by Sahil Malik on Win Smarts See other posts from Win Smarts or by Sahil Malik
Published on Wed, 12 Jan 2011 18:44:11 GMT Indexed on 2011/01/12 23:56 UTC
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SharePoint 2010

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Here is a little tip that will save you hours of head scratching. See there are two ways to update data in SharePoint using REST based API. A PUT request is used to update an entire entity. If no values are specified for fields in the entity, the fields will be set to default values. A MERGE request is used to update only those field values that have changed. Any fields that are not specified by the operation will remain set to their current value. Now, sit back and think about it. You are going to update the entire entity! Hmm. Which means, you need to a) specify every column value, and b) ensure that the read only values match what was supplied to you. What a pain in the donkey! So 99/100 times, a PUT request will give you a HTTP 500 internal server error occurred, which is just so helpful.

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