CODEWITHSUNDEEP
grails
Eddard Stark
Eddard Stark

Reputation: 3595

TransientObjectException in grails

I am working on a project and I have two domains.

class Author {
     Book book
     String name
}

class Book {
     Author author
     String title
}

I have saved an instance of domain Author in database and in a service I do something like this:

def authorInstance = Author.getById(1)
def bookInstance = new Book(author:authorInstance, title: "Foo")

But i do not save the bookInstance rather, I use it for couple of more processes. This gives me org.hibernate.TransientObjectException. I also tried to do something like:

def authorInstance = Author.getById(1)
def aI = authorInstance
def bookInstance = new Book(aI, title: "Foo")

But in this case too, I get the same error. I am working in this way because I am working in legacy code, so I cannot change much. Is there a work around for this ?

Upvotes: 0

Views: 403

Answers (2)

sf_jeff
sf_jeff

Reputation: 384

By the way, there is another issue with your possible replacement code. Instead of:

def bookInstance = new Book(aI, title: "Foo")

you would need 

def bookInstance = new Book(author:aI, title: "Foo")

Book has an in-memory constructor declared which takes a Map object and "author" and "title" are keys into that Map. This constructure then uses the map to initialize class members.

Upvotes: 0

Victor Sergienko
Victor Sergienko

Reputation: 13475

You're apparently changeing some field of authorInstance you set. That's what TransientObjectException says: "object references an unsaved transient instance". Please do read and do quote the error messages.

Save the Author before saving a book. Or do not modify it.

An you probably would like to use hasMany and belongsTo.

Upvotes: 1

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