在Spring MongoDB中的ReplaceRoot管道阶段内使用$ mergeObjects [英] Use $mergeObjects inside ReplaceRoot pipeline stage in Spring MongoDB
问题描述
我希望将此片段重现为Java代码:
i'm looking to reproduce this snipet into Java code :
db.getCollection('admins_comptes_client_ceov4').aggregate([
{$lookup: {from: "contrats_ceov4",localField: "CUSTOMERNUMBER",foreignField: "CUSTOMERNUMBER",as: "arrayForeignObject"}
{$unwind: { path: "$arrayForeignObject", preserveNullAndEmptyArrays: true}},
{$replaceRoot: { newRoot: { $mergeObjects: [ "$arrayForeignObject", "$$ROOT" ] } }},
{ $project: { "arrayForeignObject": 0, "_id": 0 } },
{ $out: "aggregate" }])
到目前为止，我在这里:
I'm here so far :
AggregationOperation lookup = Aggregation.lookup(fromCollection, localField, toMatchWith, "arrayForeignObject");
AggregationOperation unwind = Aggregation.unwind("arrayForeignObject", true);
AggregationOperation replaceRoot = Aggregation.replaceRoot(Aggregation.ROOT);
AggregationOperation project = Aggregation.project("arrayForeignObject").andExclude("_id");
AggregationOperation out = Aggregation.out("aggregate");
Aggregation aggregation = Aggregation.newAggregation(lookup, replaceRoot, unwind, project, out);
mongoTemplate.aggregate(aggregation, initialCollection, AggregateModel.class);
关于以下几点，我遇到了一个问题:
{$replaceRoot: { newRoot: { $mergeObjects: [ "$arrayForeignObject", "$$ROOT" ] } }
我无法成功制作mergeObjects.
使用以下以下Java代码段，AggregationOperation结果为:
I've got an issue on the following point :
{$replaceRoot: { newRoot: { $mergeObjects: [ "$arrayForeignObject", "$$ROOT" ] } }
I can't succeed to make a mergeObjects.
With this following java snippet, the AggregationOperation outcome is :
"$replaceRoot" : { "newRoot" : "$arrayForeignObject" }
当我执行此Java代码段时，最终得到的新集合只有内部的外部数组和_id字段.
When i execute this java snippet, i end up with the new collection having only the foreign array inside and an _id field.
有人有没有遇到过这种情况，可以帮忙吗? Frigg0
Does anyone faced this already and could give a hand please? Frigg0
推荐答案
您在这里遇到了几个问题.使用2.1.0发行版Spring Mongodb jar.
You have couple of issues here. Use 2.1.0 Release Spring Mongodb jar.
AggregationOperation replaceRoot = Aggregation.replaceRoot().withValueOf(ObjectOperators.valueOf("arrayForeignObject").mergeWith(Aggregation.ROOT));
AggregationOperation project = Aggregation.project().andExclude("_id", "arrayForeignObject");
Aggregation aggregation = Aggregation.newAggregation(lookup, unwind, replaceRoot, project, out);
对于Spring mongodb的较低版本
For lower versions of spring mongodb
AggregationOperation replaceRoot = ReplaceRootOperation.builder().withDocument("$mergeObjects", Arrays.asList("$arrayForeignObject", Aggregation.ROOT));
AggregationOperation project = Aggregation.project().andExclude("_id", "arrayForeignObject");
Aggregation aggregation = Aggregation.newAggregation(lookup, unwind, replaceRoot, project, out);
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