mirror of https://github.com/mongodb/mongo
41 lines
1.5 KiB
JavaScript
41 lines
1.5 KiB
JavaScript
// @tags: [does_not_support_stepdowns]
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/** Demonstrate that mapReduce can accept functions represented by strings.
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* Some drivers do not have a type which represents a Javascript function. These languages represent
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* the arguments to mapReduce as strings.
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*/
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(function() {
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"use strict";
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var col = db.function_string_representations;
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col.drop();
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assert.writeOK(col.insert({
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_id: "abc123",
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ord_date: new Date("Oct 04, 2012"),
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status: 'A',
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price: 25,
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items: [{sku: "mmm", qty: 5, price: 2.5}, {sku: "nnn", qty: 5, price: 2.5}]
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}));
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var mapFunction = "function() {emit(this._id, this.price);}";
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var reduceFunction = "function(keyCustId, valuesPrices) {return Array.sum(valuesPrices);}";
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assert.commandWorked(col.mapReduce(mapFunction, reduceFunction, {out: "map_reduce_example"}));
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// Provided strings may end with semicolons and/or whitespace
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mapFunction += " ; ";
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reduceFunction += " ; ";
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assert.commandWorked(col.mapReduce(mapFunction, reduceFunction, {out: "map_reduce_example"}));
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// $where exhibits the same behavior
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var whereFunction = "function() {return this.price === 25;}";
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assert.eq(1, col.find({$where: whereFunction}).itcount());
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whereFunction += ";";
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assert.eq(1, col.find({$where: whereFunction}).itcount());
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// db.eval does not need to be tested, as it accepts code fragments, not functions.
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// system.js does not need to be tested, as its contents types' are preserved, and
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// strings are not promoted into functions.
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})();
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