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Define projection function contract: returned doc shouldn't retain anything from the passed argument.

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This commit is contained in:
Slava Kim
2013-11-11 11:43:06 -08:00
committed by David Glasser
parent afb2aaece7
commit 74c9373d3a
2 changed files with 37 additions and 0 deletions
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31
packages/minimongo/minimongo_tests.js
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@@ -1151,6 +1151,37 @@ Tinytest.add("minimongo - fetch with projection, subarrays", function (test) {
{a: [ [ { c: 2 }, { c: 4 } ], { c: 5 }, [ { c: 9 } ] ] });
});
Tinytest.add("minimongo - fetch with projection, deep copy", function (test) {
// Compiled fields projection defines the contract: returned document doesn't
// retain anything from the passed argument.
var doc = {
a: { x: 42 },
b: {
y: { z: 33 }
},
c: "asdf"
};
var fields = {
'a': 1,
'b.y': 1
};
var projectionFn = LocalCollection._compileProjection(fields);
var filteredDoc = projectionFn(doc);
doc.a.x++;
doc.b.y.z--;
test.equal(filteredDoc.a.x, 42, "projection returning deep copy - including");
test.equal(filteredDoc.b.y.z, 33, "projection returning deep copy - including");
fields = { c: 0 };
projectionFn = LocalCollection._compileProjection(fields);
filteredDoc = projectionFn(doc);
doc.a.x = 5;
test.equal(filteredDoc.a.x, 43, "projection returning deep copy - excluding");
});
Tinytest.add("minimongo - observe ordered with projection", function (test) {
// These tests are copy-paste from "minimongo -observe ordered",
// slightly modified to test projection

6
packages/minimongo/projection.js
View File

@@ -1,4 +1,10 @@
// Knows how to compile a fields projection to a predicate function.
// @returns - Function: a closure that filters out an object according to the
// fields projection rules:
// @param obj - Object: MongoDB-styled document
// @returns - Object: a document with the fields filtered out
// according to projection rules. Doesn't retain subfields
// of passed argument.
LocalCollection._compileProjection = function (fields) {
var _idProjection = _.isUndefined(fields._id) ? true : fields._id;
var details = projectionDetails(fields);