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I'm stuck. I created a collection that has a pointer to a user in the Users collection.

When I try to invoke the service to create a new row in that collection I get a 'DBSC241 error Pointer column value of field 'UserID' must be JSON object but has 'class java.lang.String'.
In Tiggzi builder I put in a JS in the data mapping to have this JSON style object :
"return '{"collName":"Users", "_id":"'+value+'"}';"
When I do the same via the test option in the service, it does work. What am I doing wrong?

Check in Chrome Dev. Tools (or Firebug), Network tab -- for the actual request that's being sent. If it works from test but fails from the page, most likely the syntax in request is not valid.

I'm not sure whether the "\" should be there. Try to set it up this way: a href=""http://docs.tiggzi.com/documentation/ap ... pt_mapping"" rel=""nofollow""http://docs.tiggzi.com/documentation/.../a"

Yes, that worked! Thanks!

\""_id\"":\""51055644e4b0e330589c5a37\""}""