MongoDB aggregation Shell script for MongoC # Driver

Question

How to convert this Mongo Shell script to a MongoDB C # driver?

var myItems = []

var myCursor = db.Tickets.aggregate(
   [
      { $match : { TicketProjectID : 49 } },
      { $project: { TicketProjectID:1, TicketID:1, concatValue: { $concat: [ "$Status", " - ", "$Name" ] } } }
    // I will have a list of fields that I need to concatenate at run time. So C# query should support concatenation for "N" number of fields at run-time.
      //{ $group: { _id: null, count: { $sum: 1 } } }

   ],
      { allowDiskUse: true }
)

   //This seems like a ugly performance approach when we are working against 100k results with above match
     while (myCursor.hasNext()) {
         var item = myCursor.next();
         if(item.concatValue.search(/mysearchkey/i) > -1)
             {
                myItems.push(item.TicketID)
             }
    }    
    myItems

or is there a better way to do a string search in a concatenated projection instead of a foreach in the cursor, as some queries may get 50k records.

This is what I have tried so far , (without using aggregation)

Note. Highlight this code in the set for public Q & A sites. Therefore, please consider this as a pseudo code

 var tickets = ticketsCollection.FindSync(filter).ToList();
                string concatinatedValue = string.Empty;
                foreach (var ticket in tickets)
                {
                    foreach (var field in customFieldsForThisProject)
                        concatinatedValue += ticket[field.Replace(" ", "_")];

                  if(concatinatedValue.StripHtml().contains("MysearchWord"))
                 {
                   TikectIdList.Add(ticket["TicketID"])
                 }
                }

Answer 1

Edited in accordance with this comment

If you can use AsQueryable (), you can get these values:

var dbResult = from ticket in ticketsCollection.AsQueryable()
               where ticket.TicketProjectID == 49
               select new 
               {
                   TicketProjectID = ticket.TicketProjectID,
                   TicketID = ticket.TicketID,
                   ConcatValue = ticket.Status + " - " + ticket.Name
               };

- :

var result = from dbr in dbResult
             where dbr.ConcatValue.Contains("something") //or
             where dbr.ConcatValue.StartsWith("something")//or you can use regex
             select dbr;

. - Status Name Ticket String , mongo ToString() .

, db .

note, i'm not that good with mongo shell i could mess something up but you can see in which way you could go

:

var command = @"db.Tickets.aggregate(
[
    { $project: { TicketProjectID:1, TicketID:1, concatValue: { $concat: [ "$Status", " - ", "$Name" ] } } },
    { $match : { TicketProjectId : 49, concatValue : { $regex : /mysearchkey/i } } }
],
{ allowDiskUse : true }
);";

# RunCommandAsync MongoDatabase.

var result = await mongoDatabase.RunCommandAsync<BsonDocument>(BsonDocument.Parse(command));

Answer 2

@Nikola.Lukovic, , .

: #

var ticketsCollection = _mongoConnect.Database.GetCollection<BsonDocument>("Tickets");

            var dbResult = from ticket in ticketsCollection.AsQueryable()
                select new
                {
                    TicketProjectID = ticket["TicketProjectID"],
                    TicketID = ticket["TicketID"],
                    ConcatValue = ticket["Status"] + (string) ticket["Name"]
                };
            var matches = from dbr in dbResult
                where dbr.ConcatValue.Contains(searchKey)
                where dbr.ConcatValue.StartsWith(searchKey)
                select dbr;

, concatenate - , $add numeric date.

: RunCommand Shell. . .

        var projectCommand =
            BsonDocument.Parse(
                "{ $project: { _id: -1, TicketProjectID:1, TicketID:1, concatValue: { $concat: [ \"$Status\", \" - \", \"$Name\" ] } } }");
        var matchCommand =
            BsonDocument.Parse("{ $match: {concatValue: { $regex: '" + searchKey + "', $options: 'i'} } }");

        var pipeline = new[] {projectCommand, matchCommand};
        var result = ticketsCollection.Aggregate<BsonDocument>(pipeline).ToList();
        if (result.Count > 0)
            return result.Select(x => (int)x["TicketID"]).ToList();
        return null;