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{
projectID:'abcd'
,groups:{
'1':'www.sina.com.cn'
,'2':'www.sohu.com'
}
}
db.collection.ensureIndex( { "projectID": 1, "groups.1" :1}, { unique: true } )
db.collection.ensureIndex( { "projectID": 1, "groups.2" :1}, { unique: true } )