MongoDB SSIS with $unwind - ssis

Question

I recently started using MongoDB as a source in SSIS (using C# driver). I am very new with MongoDB and C#.
When I did not have nested documents, statements like below worked for me:
var query = Query.And(Query.Or(Query.GT("CreatedOn",maxUpdatedOnBSON), Query.GT("UpdatedOn", maxUpdatedOnBSON)),
Query.Or(Query.LT("CreatedOn", cutoffDate), Query.LT("UpdatedOn", cutoffDate)),Query.In("TestType", testTypes) );
MongoCursor<BsonDocument> toReturn = collection.Find(query);
Now, I got nested documents. I was able to create java script, and it works with MongoDB itself
db.Test.aggregate( [
{ $unwind : { path: "$Items",includeArrayIndex: "arrayIndex"} } ,
{ $match: { $and: [
{$or: [ { CreatedOn: { $gt: ISODate("2015-11-22T00:00:00Z")} }, {UpdatedOn: { $gt: ISODate("2015-11-22T00:00:00Z") } } ] },
{$or: [ { CreatedOn: { $lt: ISODate("2016-05-09T00:00:00Z")} }, {UpdatedOn: { $lt: ISODate("2016-05-09T00:00:00Z") } } ] }
] }
}] )
In C#, as I understand, I have to use aggregate instead of find but I cannot translate this code to C#. I still have selection criteria and unwind.
Can you please help?

Answer 1

because there is no collection template posted, i'm attaching a snippet something similar to what you would be looking for. does this help?
var builder = Builders<BsonDocument>.Filter;
//and operator can be used similar to below by using operator "&" or builder.And.
var filter = builder.Eq("state", "nj") | builder.Eq("state", "CO");
var filter2 = builder.Eq("pop", 6033) | builder.Eq("city", "nyc");
filter = builder.And(filter, filter2);
var pipeline = grades.Aggregate()
.Unwind(x => x["Items"])
.Match(filter);
var list = pipeline.ToList();
foreach (var item in list)
{
//do something
}

Answer 2

I got help and sharing the solution:
//Create matching criteria used in the aggregation pipeline to bring back only the specified documents based on date range
var match = new BsonDocument("$match",
new BsonDocument("$and",
new BsonArray()
.Add(new BsonDocument("$or", new BsonArray().Add(new BsonDocument("CreatedOn", new BsonDocument("$gt", maxUpdatedOnBSON))).Add(new BsonDocument("UpdatedOn", new BsonDocument("$gt", maxUpdatedOnBSON)))))
.Add(new BsonDocument("$or", new BsonArray().Add(new BsonDocument("CreatedOn", new BsonDocument("$lt", cutoffDate))).Add(new BsonDocument("UpdatedOn", new BsonDocument("$lt", cutoffDate)))))));
//create the arguments to pass to the $unwind method of the aggregation
var unwindargs = new BsonDocument("path", "$LineItems");
unwindargs.Add("includeArrayIndex", "arrayIndex");
//create the unwind stage and add the arguments
var unwind = new BsonDocument("$unwind", unwindargs);
//create a new pipeline and gather the results
var pipeline = new[] { match, unwind };
var mongoArgs = new AggregateArgs { Pipeline = pipeline };
var toReturn = collection.Aggregate(mongoArgs).ToList();