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// Cannot implicitly shard accessed collections because of extra shard key index in sharded
// collection.
// @tags: [assumes_no_implicit_index_creation, requires_fastcount]
// unique index constraint test for updates
// case where object doesn't grow tested here
t = db.indexa;
t.drop();
t.ensureIndex({x: 1}, true);
t.insert({'x': 'A'});
t.insert({'x': 'B'});
t.insert({'x': 'A'});
assert.eq(2, t.count(), "indexa 1");
t.update({x: 'B'}, {x: 'A'});
a = t.find().toArray();
u = Array.unique(a.map(function(z) {
return z.x;
}));
assert.eq(2, t.count(), "indexa 2");
assert(a.length == u.length, "unique index update is broken");
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