CODEWITHSUNDEEP
mongodb.net-core
Mer Merced
Mer Merced

Reputation: 33

Mongodb C# driver Insert new child of object to parents

I want to insert new child on the record below and i use this code on .net core

            var builder = Builders<parent>.Filter;
            var filter = builder.Eq("_id", "123");
            var update = Builders<parent>.Update.AddToSet<IEnumerable<Child>> 
            ("Child", Child);

            await _expensesContext.collection.UpdateOneAsync(filter, update);

  parent
  {
   "_Id": "123"
    "Child": [
    {"Id": "1234", "name": "jhon"}
    ]
  }

but i enconter this error Unable to cast object of type 'System.Collections.Generic.List`1[child]' to type 'Child'.'

Upvotes: 0

Views: 478

Answers (1)

Mer Merced
Mer Merced

Reputation: 33

I fixed this using addtosetEach instead of addtoset:

 var builder = Builders<parent>.Filter;
            var filter = builder.Eq("_id", "123");
            var update = Builders<parent>.Update.AddToSetEach<IEnumerable<Child>> 
            ("Child", Child);

            await _Context.collection.UpdateOneAsync(filter, update);

Upvotes: 1

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