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