func loadChain(c *markovianomatic.Chain, dbc *mgo.Collection) {
iter := dbc.Find(bson.M{}).Iter()
var node model.Node
for iter.Next(&node) {
c.Set(node.Key, node.Choices)
}
if err := iter.Close(); err != nil {
fmt.Fprintf(os.Stderr, "Error iterating the collection: %s\n", err.Error())
os.Exit(1)
}
}
