PrinceAdeleke opened a new issue, #14398:
URL: https://github.com/apache/grails-core/issues/14398
I've created a small grails application where a Book has an Author. I create
an instance of book and author and saved the objects to the database. In the
Book class I have an event `beforeValidate` that tags the book by concatenating
the title and author name. When saving the object an exception is thrown
`grails.validation.ValidationException: Validation error occurred during call
to save()`.
### Version:
#### Grails
4.0.0.RC2
#### Mongodb
7.0.0 (`org.grails.plugins:mongodb:7.0.0` in build.gradle)
### Expected Behaviour
The book should update without any constraint violations.
### Actual Behaviour
When saving the book an error is thrown. The error states that the author
name has been rejected and must be unique.
`arguments [name,class library.Author,Charles Perrault]; default message
[Property [{0}] of class [{1}] with value [{2}] must be unique]`. See
stacktrace below.
## Stacktrace:
```
- Field error in object 'library.Book' on field 'author.name': rejected
value [Charles Perrault]; codes
[library.Author.name.unique.error.library.Book.author.name,library.Author.name.unique.error.author.name,library.Author.name.unique.error.name,library.Author.name.unique.error.java.lang.String,library.Author.name.unique.error,author.name.unique.error.library.Book.author.name,author.name.unique.error.author.name,author.name.unique.error.name,author.name.unique.error.java.lang.String,author.name.unique.error,library.Author.name.unique.library.Book.author.name,library.Author.name.unique.author.name,library.Author.name.unique.name,library.Author.name.unique.java.lang.String,library.Author.name.unique,author.name.unique.library.Book.author.name,author.name.unique.author.name,author.name.unique.name,author.name.unique.java.lang.String,author.name.unique,unique.library.Book.author.name,unique.author.name,unique.name,unique.java.lang.String,unique];
arguments [name,class library.Author,C
harles Perrault]; default message [Property [{0}] of class [{1}] with value
[{2}] must be unique]
```
### Example Application
#### Bootstrap.groovy
```
package bookstore
import library.Author
import library.Book
class BootStrap {
def init = { servletContext ->
Author.findAll().each { it.delete(flush: true, failOnError: true) }
Book.findAll().each { it.delete(flush: true, failOnError: true) }
Author author = new Author(name: "Charles Perrault").save(flush:
true, failOnError: true)
new Book(title: 'Little Red Riding Hood', author:
author).save(flush: true, failOnError: true)
Book.withNewSession {
Book book = Book.findByTitle('Little Red Riding Hood')
book.save(failOnError: true)
}
}
}
```
#### Author.groovy
```
package library
import org.bson.types.ObjectId
class Author {
ObjectId id
String name
static constraints = {
name(blank: false, unique: true)
}
}
```
#### Book.groovy
```
package library
import org.bson.types.ObjectId
class Book {
ObjectId id
Author author
String title
String tag
static mapping = {
version false
}
static constraints = {
title(blank: false)
author(nullable: false)
}
def beforeValidate() {
tag = ("${title} ${author.name}").toLowerCase().split(' ').join('-')
}
}
```
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