MongoDB update query not working

Question

I am running the below query and It does not work. When I run the query part in mongo UI, it returns me expected result. I am using UMongo. But it does not update the document as expected.

db.system.js.save ({    
_id:"script_1",
value: function() {

    print("in function>>");             

    db.data.find({"$and": 
        [{"title":{$regex : '.*Green Red.*', $options : 's'}},
         {"editor.key": {"$in": ["74014","45339"]}}, {"types" : {"$in": ["Notes"]}}]}).forEach(
          function(docMatch){
                  print("Matching document found");
                      db.data.update(docMatch, 
                              {$set:{"editor.key": "05335","editor.value": "editor1", 
                          "editor.email": "editor1@gmail.com"}
                    }, false, true);
      }
    );

    db.data.reIndex();
    }
 });

 db.eval("script_1()");  

I do see "Matching document found" in the mongo logs but does not update. Shows below message too in the logs.

     Thu Sep 19 11:03:43 [conn1279] warning: ClientCursor::yield can't unlock b/c of recursive lock ns             

Thanks for you help !

Answer 1

I'm not sure exactly what the problem is without having your data and being able to run your query. However, there are lots of issues with this code:

• Why save this as a script and then call db.eval() rather than running your update directly?
• Why do you need to reindex?
• You do not need the $and operator in your query.
• You do not need separate calls to find and update; in fact, one call to update with the multiupdate flag set to true should suffice.
• The $in is unnecessary in {"$in": ["Notes"]}.
• Using {$regex: '.Green Red.'} could potentially be slow. The $regex operator cannot use an index in this case because an index can only be used to match a prefix. See the last paragraph here: http://docs.mongodb.org/manual/reference/operator/regex/.

If this is code generated by UMongo, I recommend moving away from UMongo and working with the officially supported mongo shell.

In order to fix your call to update, try running something like this in the mongo shell:

db.data.update(
  {
    "title": {$regex : '.*Green Red.*', $options : 's'},
    "editor.key": {"$in": ["74014","45339"]},
    "types" : "Notes"
  },
  {
    $set: {
            "editor.key": "05335",
            "editor.value": "editor1",
            "editor.email": "editor1@gmail.com"
          }
  },
  false,
  true
);