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// In MongoDB 3.4, $graphLookup was introduced. In this file, we test the behavior of graphLookup
// when the 'connectToField' is a nested array, or when the 'connectFromField' is a nested array.
(function() {
"use strict";
var local = db.local;
var foreign = db.foreign;
local.drop();
foreign.drop();
// 'connectFromField' is an array of objects.
var bulk = foreign.initializeUnorderedBulkOp();
for (var i = 0; i < 100; i++) {
bulk.insert({_id: i, neighbors: [{id: i + 1}, {id: i + 2}]});
}
assert.writeOK(bulk.execute());
assert.writeOK(local.insert({starting: 0}));
var res = local.aggregate({
$graphLookup: {
from: "foreign",
startWith: "$starting",
connectFromField: "neighbors.id",
connectToField: "_id",
as: "integers"
}
}).toArray()[0];
assert.eq(res.integers.length, 100);
foreign.drop();
// 'connectToField' is an array of objects.
var bulk = foreign.initializeUnorderedBulkOp();
for (var i = 0; i < 100; i++) {
bulk.insert({previous: [{neighbor: i}, {neighbor: i - 1}], value: i + 1});
}
assert.writeOK(bulk.execute());
var res = local.aggregate({
$graphLookup: {
from: "foreign",
startWith: "$starting",
connectFromField: "value",
connectToField: "previous.neighbor",
as: "integers"
}
}).toArray()[0];
assert.eq(res.integers.length, 100);
foreign.drop();
// Both 'connectToField' and 'connectFromField' are arrays of objects.
var bulk = foreign.initializeUnorderedBulkOp();
for (var i = 0; i < 100; i++) {
bulk.insert({
previous: [{neighbor: i}, {neighbor: i - 1}],
values: [{neighbor: i + 1}, {neighbor: i + 2}]
});
}
assert.writeOK(bulk.execute());
var res = local.aggregate({
$graphLookup: {
from: "foreign",
startWith: "$starting",
connectFromField: "values.neighbor",
connectToField: "previous.neighbor",
as: "integers"
}
}).toArray()[0];
assert.eq(res.integers.length, 100);
}());
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