In Node.js Mongoose, I want to update each field...how can I do that?

User.find({},function(err,docs){ 
            foreach(docs as d){
                d.name="apple";
                d.sav开发者_运维问答e();
            };
        }); 

This doesn't work! I get some "unique identifier" error. Can someone fix this for me?

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I think you're using foreach incorrectly. Try replacing the contents of your callback with this:

docs.forEach(function(elem, index, array) {
    elem.name = "apple";
    elem.save();
});

Check out the MDC for more information on foreach.

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Does d have a unique index set? If so you will be unable to set the same thing for multiple instances.