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copied!<p>There are multiple ways you can handle this.</p> <p><strong>Using a map:</strong></p> <pre><code>var m bson.M err := collection.Find(nil).One(&m) check(err) for key, value := range m { fmt.Println(key, value) } </code></pre> <p>Note that there's nothing special about <a href="http://labix.org/v2/mgo/bson#M" rel="noreferrer">bson.M</a> as far as mgo is concerned. It's just a <code>map[string]interface{}</code> type, and you can define your own map types and use them with mgo, even if they have a different value type.</p> <p><strong>Using a document slice:</strong></p> <p>The <a href="http://labix.org/v2/mgo/bson#D" rel="noreferrer">bson.D</a> is a slice that is internally known to mgo, and it exists both to offer a more efficient mechanism and to offer a way to preserve the ordering of keys, which is used by MongoDB in some circumstances (for example, when defining indexes).</p> <p>For example:</p> <pre><code>var d bson.D err := collection.Find(nil).One(&d) check(err) for i, elem := range d { fmt.Println(elem.Name, elem.Value) } </code></pre> <p><strong>Using an ,inline map field</strong></p> <p>The <code>,inline</code> bson <a href="http://labix.org/v2/mgo/bson#Marshal" rel="noreferrer">flag</a> can also be used in a map field, so that you can have your cake and eat it too. In other words, it enables using a struct so that manipulating known fields is convenient, and at the same time allows dealing with unknown fields via the inline map.</p> <p>For example:</p> <pre><code>type Person struct { ID bson.ObjectId `bson:"_id,omitempty"` Name string Phone string Extra bson.M `bson:",inline"` } </code></pre>

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