Assign UIDs in Slash GraphQL

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There is a hack way of leasing UIDs. A simple mutation with empty data.

e.g:

{
   set  {
    _:Lease1 <dgraph.type> "Object" .
    _:Lease2 <dgraph.type> "Object" .
    _:Lease3 <dgraph.type> "Object" .
    _:Lease4 <dgraph.type> "Object" .
    _:Lease5 <dgraph.type> "Object" .
    _:Lease6 <dgraph.type> "Object" .
    _:Lease7 <dgraph.type> "Object" .
   }
}

And then you can use a method to extract the UIDs.