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POSelf Tracking Entities - AcceptChanges cannot continue because the object's key values conflict with another object in the ObjectStateManager
 

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  1. POSelf Tracking Entities - AcceptChanges cannot continue because the object's key values conflict with another object in the ObjectStateManager
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    <p>I've been stuck with this problem for over a week now. Hopefully some one can point me in the right direction.</p> <p>I start with a brief description of my schema.</p> <p>Asset 1--->1 Address *-->1 Area *-->1 Region *-->1 Country</p> <p>Package 1-->* Asset</p> <p>Using Self Tracking Entity (STE) + WCF.</p> <p>Steps:</p> <ol> <li>Call data store for a list of assets.</li> <li>Call data store for a list of packages.</li> <li>User selects a package and assign some assets to it.</li> <li>Save package.</li> </ol> <p>In step 2, the call uses eager loading of Addresses.</p> <pre><code>from p in context.Assets.Include("Address.Area.Region.Country") </code></pre> <p>This is the error when attempting to call</p> <pre><code>context.Packages.ApplyChanges(package) </code></pre> <blockquote> <p>AcceptChanges cannot continue because the object's key values conflict with another object in the ObjectStateManager. Make sure that the key values are unique before calling AcceptChanges.</p> </blockquote> <p><strong>EDIT</strong></p> <p>After snooping around, i found that this is a STE issue. The problem being you cannot persist a graph that contains multiple instances of the same entity as outlined <a href="http://social.msdn.microsoft.com/Forums/en-US/adonetefx/thread/a15a2276-b9d5-4e77-bdf7-545d745bc590" rel="nofollow noreferrer">here</a>. Here is my question.</p> <blockquote> <p>How can I add an entity to my entity collection. The new entity may have related entities that contain the same key as one already in the collection. I.e. Add a new asset that may contain the same address, area, region or country entity.</p> </blockquote> <p>Here are my constrains:</p> <ol> <li>I must use the navigational collection because it affect the UI.</li> <li>I cannot pre-fetch all entities that will be involved because the data set is simply too large.</li> <li>I must be able to take snap-shots of the entity at anytime in order to keep a history and use it to "undo" any changes.</li> </ol> <p>I am aware of the possible solutions suggested by <strong>Diego B Vega</strong>, but those are not options i can use for my solution. Has anyone any other ideas?</p>
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    1. COYou have duplicate keys, which isn't allowed. That's all I can say without having your code.
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      1. USCraig Stuntz
    2. COI think you need to post a minimalistic code example where the error occurs. It's hardly possible to say anything rather than you have duplicate keys from the info provided in your post.
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      1. USYury Tarabanko
 

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