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> for( i = 1 ; i <= 10 ; i++ ) { for( j = 1; j <= 10 ; j++ ) { for( k = 1 ; k <= 10 ; k++ ) { db.foo.insert( { a : i , b : j , c : k } ) } } } WriteResult({ "nInserted" : 1 })

Expected result: 1,000 documents are inserted, and WriteResult(
{ "nInserted" : 1000 }
)

Actual result: 1,000 documents are inserted (good) but WriteResult(
{ "nInserted" : 1 }
) is displayed, implying that we've only added one document to the collection.
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> for ( i = 1 ; i <= 10 ; i++ ) { for ( j = 1; j <= 10 ; j++ ) { for ( k = 1 ; k <= 10 ; k++ ) { db.foo.insert( { a : i , b : j , c : k } ) } } } WriteResult({ "nInserted" : 1 }) Expected result: 1,000 documents are inserted, and WriteResult( { "nInserted" : 1000 } ) Actual result: 1,000 documents are inserted (good) but WriteResult( { "nInserted" : 1 } ) is displayed, implying that we've only added one document to the collection.

If I have a for loop that inserts documents in the shell, only the last insert will give a WriteResult.

This is confusing because LOTS of documents may have been inserted, yet all we see is WriteResult: 1.