[{id:1,name:"Brasilian",category:"cofee",userId:9},{id:2,name:"Colombian",category:"cofee",userId:9},{id:3,name:"Apple",category:"fruit",userId:8},{id:4,name:"Strawberry",category:"fruit",userId:8},{id:5,name:"Banana",category:"fruit",userId:7}]

db.collection.update({userId:8,category:"fruit",},{$set:{category:"good fruit"}},{multi:true})