File: fm4.js

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mongodb 1%3A2.4.10-5
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t = db.fm4
t.drop();

t.insert({_id:1, a:1, b:1});

assert.eq( t.findOne({}, {_id:1}), {_id:1}, 1)
assert.eq( t.findOne({}, {_id:0}), {a:1, b:1}, 2)

assert.eq( t.findOne({}, {_id:1, a:1}), {_id:1, a:1}, 3)
assert.eq( t.findOne({}, {_id:0, a:1}), {a:1}, 4)

assert.eq( t.findOne({}, {_id:0, a:0}), {b:1}, 6)
assert.eq( t.findOne({}, {       a:0}), {_id:1, b:1}, 5)

// not sure if we want to suport this since it is the same as above
//assert.eq( t.findOne({}, {_id:1, a:0}), {_id:1, b:1}, 5)