Grails multi datasource domain issue - database

Question

I have a project which tables spread between 2 datasources.
I'm configuring the code to access table as per 3.3.6 topic in grails documentations
http://grails.org/doc/2.0.0.M2/guide/conf.html#dataSourcesAndEnvironments
Everything seems to be ok, but I got the following error
Message: Error creating bean with name 'transactionManagerPostProcessor': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Invocation of init method failed; nested exception is org.hibernate.MappingException: Association references unmapped class: br.com.fisgo.Provider
Caused by MappingException: Association references unmapped class: br.com.fisgo.Provider
Any idea on why do I get this error?
Regards.
I'll try it out.
It won't be that simple because Company domain links back to Provider
It will just require more efort
class Company {
String name
String cnpj
String email
Address address
Phone phone
String registration
String source
Set provider = new HashSet<Provider>()
static hasMany = [provider: Provider]

Answer 1

You should use newer docs, e.g. http://grails.org/doc/latest/guide/conf.html#dataSourcesAndEnvironments
It looks like you're trying to link across datasources. This isn't possible since each DataSource has a separate SessionFactory, and they cannot work directly together. The same problem happens when you use Hibernate and a NoSQL GORM plugin.
You can mimic it easily enough though. Given a domain class Foo that needs a reference to Provider, you can persist the foreign key and look it up on-demand (and this is really what Hibernate does for you when you join between two domain classes):
class Foo {
Long providerId
Provider getProvider() {
providerId ? Provider.get(providerId) : null
}
void setProvider(Provider provider) {
providerId = provider.id
}
static transients = ['provider']
}
Since Groovy treats getter/setter pairs as a property, you would use it like a "real" link:
def foo = ...
def bar = foo.provider.bar