How exactly Update works? about mongorepository

[RobThree]

How exactly Update works?

You do understand that this project is open source and based on the mongo-csharp-driver? You could just have a look at the update method and see exactly what it does: Call the driver's Save() method. And it is documented perfectly fine:

Save Method

The Save method is a combination of Insert and Update. If the Id member of the document has a value, then it is assumed to be an existing document and Save calls Update on the document (setting the Upsert flag just in case it actually is a new document after all). Otherwise it is assumed to be a new document and Save calls Insert after first assigning a newly generated unique value to the Id member.

Also the message is pretty clear: "E11000 duplicate key error". The id (note: Id) member of the object (in you case "MComments") determines wether the Update should insert or update a document. You created a Unique Index on CommentID (note: not Id). So when you try to save a document with no Id it will try to insert (instead of what you expect: update) and then fail on the CommentID not being unique. So either make the CommentID the document/entity ID or remove the unique index (which is probably not what you want).

I don't mind giving a little bit of support and/or nudges in the right direction but please understand that we're not here to help you debug stuff you can perfectly debug yourself by just using a debugger, looking at the sourcecode and/or reading the documentation. We appreciate it when you put in a little effort yourself before opening a (non)-issue.

[bhanu7755]

I absolutely understand. As I'm new to this MongoDB I'm just confused here and there.. Sorry if I trouble you much.