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I've got a problem with creating unique indexes using Mongoose / MongoDb and can't get it to work. I'm able to add two documents with the same attribute values when I have set a unique index. I've tried everything I can think of - restarting (everything) changing the syntax etc. Code Addtion >> This is the method that I'm using to save an entity: create : function(entity, definition, successFn, errorFn){ var model = mongoose.model(entity); newModel = new model(definition); newModel.save(function(error) { if(error){ if(!errorFn){ throw error; } errorFn(newModel); return; } successFn(newModel); }); }... << var Something = new Schema({ objectId : ObjectId, name : { type : String, index: { unique: true }}, url : { type : String, index: { unique: true }}, ...etc mongoose.model('Something', Something); Mongo output [conn1] insert xxxxx.agencies 1526ms [conn1] building new index on { name: 1 } for xxxxx.agencies [conn1] insert xxxxx.system.indexes exception 11000 E11000 duplicate key error index: xxxxx.agencies.$name_1 dup key: { : "something" } 4ms [conn1] building new index on { url: 1 } for xxxxx.agencies [conn1] insert xxxxx.system.indexes exception 11000 E11000 duplicate key error index: xxxxx.agencies.$url_1 dup key: { : "http://www.something.com" } 1ms When I checked in MongoHub the indexes don't appear, so they don't look like they have been created. This is a duplicate of this question , but it doesn't have an answer that works for me.

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