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/**
* Tests to verify that $graphLookup can use the variables defined in an outer scope.
*/
(function() {
"use strict";
let local = db.graph_lookup_var_local;
let foreign = db.graph_lookup_var_foreign;
local.drop();
foreign.drop();
foreign.insert({from: "b", to: "a", _id: 0});
local.insert({});
const basicGraphLookup = {
$graphLookup: {
from: "graph_lookup_var_foreign",
startWith: "$$var1",
connectFromField: "from",
connectToField: "to",
as: "resultsFromGraphLookup"
}
};
const lookup = {
$lookup: {
from: "graph_lookup_var_local",
let : {var1: "a"},
pipeline: [basicGraphLookup],
as: "resultsFromLookup"
}
};
// Verify that $graphLookup can use the variable 'var1' which is defined in parent $lookup.
let res = local.aggregate([lookup]).toArray();
assert.eq(res.length, 1);
assert.eq(res[0].resultsFromLookup.length, 1);
assert.eq(res[0].resultsFromLookup[0].resultsFromGraphLookup.length, 1);
assert.eq(res[0].resultsFromLookup[0].resultsFromGraphLookup[0], {_id: 0, from: "b", to: "a"});
})();
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