M220N Migration Issue

MongoDB University M220N: MongoDB for .NET Developers
#1

For updating the datePipeline and ratingsPipeline I am using this code:


            if (datePipelineResults.Count > 0)
            {
                BulkWriteResult<Movie> bulkWriteDatesResult = null;

                bulkWriteDatesResult = await _moviesCollection.BulkWriteAsync(
                       datePipelineResults.Select(updatedMovie => new ReplaceOneModel<Movie>(
                       new FilterDefinitionBuilder<Movie>().Where(m => m.Id == updatedMovie.Id),
                       updatedMovie)));

                Console.WriteLine($"{bulkWriteDatesResult.ProcessedRequests.Count} records updated.");
            }

            var ratingPipelineResults = TransformRatingPipeline();
            Console.WriteLine($"I found {ratingPipelineResults.Count} docs where the imdb.rating field is not a number type.");

            if (ratingPipelineResults.Count > 0)
            {
                BulkWriteResult<Movie> bulkWriteRatingsResult = null;
           
               bulkWriteRatingsResult = await _moviesCollection.BulkWriteAsync(
                    ratingPipelineResults.Select(updatedMovie => new ReplaceOneModel<Movie>(
                    new FilterDefinitionBuilder<Movie>().Where(m => m.Id == updatedMovie.Id),
                    updatedMovie)));

                Console.WriteLine($"{bulkWriteRatingsResult.ProcessedRequests.Count} records updated.");
            }

I’m able to build and run it without any errors, but then when I go to the Status page in Mflix I get this:

Screen Shot 2022-01-13 at 1.40.20 PM
Screen Shot 2022-01-13 at 1.40.20 PM890×66 3.06 KB

Any idea where I am going wrong?

#2

Hi @Shelby_Carpenter,
Your code looks good to me, but it seems like maybe some of your documents got modified while you were doing the previous exercises, I would recommend a Database refresh by following the steps mentioned in Question 5 of this FAQ post.

Thanks & Regards,
Sourabh Bagrecha,
Curriculum Services Engineer

1 Like
#3

I just tried deleting my sample data and then reloading the sample dataset in Atlas, but am still getting the same error. Any other ideas?

#4

@Shelby_Carpenter
After you modified the code in the Migration project, have you set it as a startup project and run the code?
It should show the following messages in the terminal if executed properly.

Screenshot 2022-02-23 125202
Screenshot 2022-02-23 1252021222×637 8.72 KB

#5

I have same mistake. Please help

#6

Hi @Emre_Polat, did you try the steps mentioned in this post:

If you have any doubts, please feel free to reach out to us.

Thanks and Regards.
Sourabh Bagrecha,
MongoDB

#7

Hello @SourabhBagrecha , thank you for reply. I passed migration test. My fault is that, I did not build migration dll. After run the command which is given belown and the ticket, I succesfully completed the test.
“dotnet build
dotnet bin/Debug/netcoreapp3.1/Migrator.dll”

#8