codeconsole opened a new issue, #14511:
URL: https://github.com/apache/grails-core/issues/14511
```groovy
class User {
String id
static mapping = {
id generator: 'assigned'
}
}
```
```groovy
def graeme = new User()
graeme.id = 'graeme'
graeme.save(flush:true)
def user = User.get('graeme')
user.save(flush:true, insert:false) // results in BulkWriteError{index=0,
code=11000, message='E11000 duplicate key error collection ..
```
This is caused because there is no common session.
https://github.com/grails/grails-data-mongodb/blob/c8287aadad3777f308ff625096171c24f0eebaf4/grails-datastore-gorm-mongodb/src/main/groovy/org/grails/datastore/mapping/mongo/engine/MongoCodecEntityPersister.groovy#L186-L188
https://github.com/grails/grails-data-mongodb/blob/c8287aadad3777f308ff625096171c24f0eebaf4/grails-datastore-gorm-mongodb/src/main/groovy/org/grails/datastore/mapping/mongo/engine/MongoCodecEntityPersister.groovy#L255-L257
returns false because `session.contains(obj)` returns **false**
The following resolves the situation, but it is not intuitive.
```groovy
User.withSession {
def user = User.get('graeme')
user.save(flush:true, insert:false)
}
```
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