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// Tests basic functionality of the $function expression.
(function() {
"use strict";
load('jstests/aggregation/extras/utils.js');
const coll = db.expression_function;
coll.drop();
function f_finalize(first, second) {
return first + second;
}
for (let i = 0; i < 5; i++) {
assert.commandWorked(coll.insert({value: i}));
}
let pipeline = [{
$project: {
newValue: {
$function: {
args: ["$value", -1],
body: f_finalize,
lang: "js",
},
},
_id: 0,
}
}];
let results = coll.aggregate(pipeline, {cursor: {batchSize: 1}}).toArray();
assert(resultsEq(results,
[{newValue: -1}, {newValue: 0}, {newValue: 1}, {newValue: 2}, {newValue: 3}]),
results);
// Test that the 'body' function accepts a string argument.
pipeline[0].$project.newValue.$function.body = f_finalize.toString();
results = coll.aggregate(pipeline, {cursor: {}}).toArray();
assert(resultsEq(results,
[{newValue: -1}, {newValue: 0}, {newValue: 1}, {newValue: 2}, {newValue: 3}]),
results);
// Test that function can take an expression that evaluates to an array for the 'args' parameter.
coll.drop();
for (let i = 0; i < 5; i++) {
assert.commandWorked(coll.insert({values: [i, i * 2]}));
}
pipeline = [{
$project: {
newValue: {
$function: {
args: "$values",
body: f_finalize,
lang: "js",
},
},
_id: 0,
}
}];
results = coll.aggregate(pipeline, {cursor: {}}).toArray();
assert(resultsEq(results,
[{newValue: 0}, {newValue: 3}, {newValue: 6}, {newValue: 9}, {newValue: 12}]),
results);
// Test that the command correctly fails for invalid arguments.
pipeline = [{
$project: {
newValue: {
$function: {
'args': 'must evaluate to an array',
'body': f_finalize,
'lang': 'js',
},
},
_id: 0,
}
}];
assert.commandFailedWithCode(
db.runCommand({aggregate: coll.getName(), pipeline: pipeline, cursor: {}}), 31266);
pipeline = [{
$project: {
newValue: {
$function: {
'args': [1, 3],
'body': 'this is not a valid function!',
'lang': 'js',
},
},
_id: 0,
}
}];
assert.commandFailedWithCode(
db.runCommand({aggregate: coll.getName(), pipeline: pipeline, cursor: {}}),
ErrorCodes.JSInterpreterFailure);
pipeline = [{
$project: {
newValue: {
$function: {
'args': [1, 3],
'body': f_finalize,
},
},
_id: 0,
}
}];
assert.commandFailedWithCode(
db.runCommand({aggregate: coll.getName(), pipeline: pipeline, cursor: {}}), 31418);
pipeline = [{
$project: {
newValue: {
$function: {
'args': [1, 3],
'body': f_finalize,
'lang': 'not js!',
},
},
_id: 0,
}
}];
assert.commandFailedWithCode(
db.runCommand({aggregate: coll.getName(), pipeline: pipeline, cursor: {}}), 31419);
// Test that we fail if the 'args' field is not an array.
pipeline = [{
$project: {
newValue: {
$function: {
'args': "A string!",
'body': f_finalize,
'lang': 'js',
},
},
_id: 0,
}
}];
assert.commandFailedWithCode(
db.runCommand({aggregate: coll.getName(), pipeline: pipeline, cursor: {}}), 31266);
})();
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