mongodb - Randomizing unique data with mongo? -

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i'm trying scramble email properties in db. email defined in mongoose model unique. here's script i'm attempting run in shell

db.getcollection('users').update(   {},   {$set{     email:'sanitized'+math.random()*100000000000000000+'@'+math.random()*100000000000000000+'.com'   }},   {multi:true} )

i'm trying this:

but comes error:

duplicate key error index: test.users.$email_1 dup key

i realize math.random() isn't perfect, command has never updated more first document in collection.

how can want do?

the math.random functions executing once each client-side , 1 constant email value being passed update function.

if there not unique index on email, every user in database set same email.

you individual updates this:

db.getcollection('users').find().foreach(function(u){   db.users.update({_id : u._id}, {$set:{     email:'sanitized'+math.random()*100000000000000000+'@'+math.random()*100000000000000000+'.com'   }}) })

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