boost::optional<Document> DocumentSourceRedact::redactObject() {
const Value expressionResult = _expression->evaluate(_variables.get());
if (expressionResult == keepVal) {
return _variables->getDocument(_currentId);
} else if (expressionResult == pruneVal) {
return boost::optional<Document>();
} else if (expressionResult == descendVal) {
const Document in = _variables->getDocument(_currentId);
MutableDocument out;
out.copyMetaDataFrom(in);
FieldIterator fields(in);
while (fields.more()) {
const Document::FieldPair field(fields.next());
// This changes CURRENT so don't read from _variables after this
const Value val = redactValue(field.second);
if (!val.missing()) {
out.addField(field.first, val);
}
}
return out.freeze();
} else {
uasserted(17053,
str::stream() << "$redact's expression should not return anything "
<< "aside from the variables $$KEEP, $$DESCEND, and "
<< "$$PRUNE, but returned "
<< expressionResult.toString());
}
}
boost::optional<Document> DocumentSourceProject::getNext() {
pExpCtx->checkForInterrupt();
boost::optional<Document> input = pSource->getNext();
if (!input)
return boost::none;
/* create the result document */
const size_t sizeHint = pEO->getSizeHint();
MutableDocument out (sizeHint);
out.copyMetaDataFrom(*input);
/*
Use the ExpressionObject to create the base result.
If we're excluding fields at the top level, leave out the _id if
it is found, because we took care of it above.
*/
_variables->setRoot(*input);
pEO->addToDocument(out, *input, _variables.get());
_variables->clearRoot();
#if defined(_DEBUG)
if (!_simpleProjection.getSpec().isEmpty()) {
// Make sure we return the same results as Projection class
BSONObj inputBson = input->toBson();
BSONObj outputBson = out.peek().toBson();
BSONObj projected = _simpleProjection.transform(inputBson);
if (projected != outputBson) {
log() << "$project applied incorrectly: " << getRaw() << endl;
log() << "input: " << inputBson << endl;
log() << "out: " << outputBson << endl;
log() << "projected: " << projected << endl;
verify(false); // exits in _DEBUG builds
}
}
#endif
return out.freeze();
}
boost::optional<Document> DocumentSourceProject::getNext() {
pExpCtx->checkForInterrupt();
boost::optional<Document> input = pSource->getNext();
if (!input)
return boost::none;
/* create the result document */
const size_t sizeHint = pEO->getSizeHint();
MutableDocument out (sizeHint);
out.copyMetaDataFrom(*input);
/*
Use the ExpressionObject to create the base result.
If we're excluding fields at the top level, leave out the _id if
it is found, because we took care of it above.
*/
_variables->setRoot(*input);
pEO->addToDocument(out, *input, _variables.get());
_variables->clearRoot();
return out.freeze();
}