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How to auto-generate _id?

See original GitHub issue

I wanted to use example from this answer, but it throws:

LiteDB.LiteException
  HResult=0x80131500
  Message=Invalid BSON data type 'Null' on field '_id'.
  Source=LiteDB

I thought that LiteDB will auto-generate ‘_id’. I don’t mind it. In this example there is no ‘_id’ in BsonDocument, so I assume it is somehow auto-generated.

Any clues?

Edit:

I now see that this feature is removed from LiteDB 4.0. So how could I substitute it?

Issue Analytics

State:
Created 6 years ago
Comments:10 (4 by maintainers)

Top GitHub Comments

3reactions

mbdavidcommented, Nov 8, 2017

Hi @qqgg231, “auto index” is not the same “auto id”.

Auto index is create an index based on query execution (when you just run a query and database create an index if need). This feature was removed because now LiteDB supports full scan search too (search with no index).

Auto Id is like “Auto Increment” in sql server. This was removed in LiteDatabase level (any POCO class) and was implemented in LiteEngine level (BsonDocument only).

(sometimes is not too clear for anyone but me 😄)

1reaction

felschrcommented, Jan 19, 2018

Oh, I found the reason: https://github.com/mbdavid/LiteDB/blob/0bf2c327e2ebb91c5b8448c77df1652b921c81d2/LiteDB.Tests/Database/AutoId_Tests.cs#L82

I changed my Id property from string to Guid now and it’s working 😄