codeconsole opened a new issue, #15680:
URL: https://github.com/apache/grails-core/issues/15680
## Summary
When a domain class field has both `unique: true` in `static constraints`
and `index: true, indexAttributes: [unique: true]` in `static mapping`, the
MongoDB index is silently not created. Removing the constraint allows the index
to be created normally.
## Steps to Reproduce
1. Create a domain class with the following:
```groovy
class Category {
String name
static constraints = {
name unique: true
}
static mapWith = 'mongo'
static mapping = {
name index: true, indexAttributes: [unique: true]
}
}
```
2. Start the application and insert data via BootStrap
3. Query MongoDB for the collection's indexes:
```javascript
db.category.getIndexes()
```
**Result:** Only `_id_` index exists. The `name_1` unique index is missing.
4. Remove the constraint:
```groovy
static constraints = {
name() // removed unique: true
}
```
5. Restart and check indexes again.
**Result:** `name_1` unique index is now created correctly.
## Expected Behavior
The `index: true, indexAttributes: [unique: true]` declaration in the
mapping block should create the MongoDB index regardless of whether the
constraints block also declares `unique: true`. The constraint and the mapping
serve different purposes — constraints validate at the GORM layer, while
`indexAttributes` creates the database-level index.
## Actual Behavior
The presence of `unique: true` in the constraints block silently prevents
`initializeIndices()` from creating the MongoDB index declared in the mapping
block. No error or warning is logged.
## Additional Context
- Fields with plain `index: true` (no `indexAttributes`) are created
correctly even with constraint declarations
- Fields with `index: true, indexAttributes: [unique: true]` but WITHOUT a
constraint `unique: true` are created correctly
- The `compoundIndex([name: 1, indexAttributes: [unique: true]])` syntax is
not affected — it always creates the index regardless of constraints
- Other domain classes (Country, Type) with the same `index: true,
indexAttributes: [unique: true]` mapping but WITHOUT `unique: true` in
constraints create their indexes correctly
## Environment
- Grails: 7.2.0-SNAPSHOT
- GORM MongoDB: 7.2.0-SNAPSHOT (`grails-data-mongodb-core`)
- MongoDB: embedded (de.flapdoodle)
- Java: 25
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