[QUESTION] UpdateMany with Dictionary<string, object>

[ssteiner]

I'm using a lot of generics in my application - most documents have a common structure, so my generic bulk update has the document id's and a Dictionary<string, object> as input parameters. I then generate a new entity based on that dictionary, and provide it to UpdateMany.

var myDict = new Dictionary<string, object> 
{ 
    {"StringProp", "hello" },
    {"BoolProp", true },
    {"SubProp.StringProp", "subprop value" },
}
List<string> ids = []; // would contain the ids of the documents to update

TEntity updateEntity = myDict.ToObject<T>(); // implementation omitted
context.GetCollection<TEntity>().UpdateMany(x => updatEntity, u => ids);

if I run this, I get an exception telling me this:

Extend expression must return an anonymous class to be merge with entities. Eg: `col.UpdateMany(x => new { Name = x.Name.ToUpper() }, x => x.Age > 10)

So, how can I generate that anonymous class that UpdateMany requires?

[ssteiner]

So I hacked something together:

var script = "{";
int propertyCount = 0;
foreach (var updatedProperty in myDict.Keys)
{
    object valueToSet = myDict[updatedProperty];
    if (valueToSet is string)
        script += $"{updatedProperty}: '{valueToSet}'";
    else
        script += $"{updatedProperty}: {valueToSet}";
    propertyCount++;
}
script += "}";
var filter = BsonMapper.Global.GetExpression<T, bool>(u => ids);
context.GetCollection<TEntity>().UpdateMany(script, filter);

I did not try this for all possible types and subproperties currently don't work. Plus, you can't set a full subobject this way either.