Renaming composite foreign keys in GORM - grails

Question

I have the following classes:
class Catalog {
static mapping = {
id composite:['name', 'manufacturer']
columns {
name column:'cat_name'
manufacturer column:'manuf_id'
}
}
String name
Manufacturer manufacturer
}
class Order {
static mapping = {
columns {
// How to rename foreign keys as cat_name, manuf_id?
}
}
Catalog catalog // creates catalog_name, catalog_manufacturer_name
}
Presently, an Order table is generated with the attributes catalog_name and catalog_manufacturer_name (which reference the composite primary keys of the Catalog table).
I need to rename these generated columns to cat_name and manuf_id in the Order table to work with an existing database. Is this possible, and if so, how?

Answer 1

This solved my problem (grails 2.0.4):
http://jira.grails.org/browse/GRAILS-4504?focusedCommentId=64996&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-64996
My case:
class GroupMessage implements Serializable {
Group group
Integer messageId
static mapping = {
datasources(['ds1'])
table 't_group_msg'
version false
id composite: ['group', 'messageId'], generator: 'assigned'
group column:'grpid'
messageId column:'msgid', type:int
}
}
class GroupMessageDetail implements Serializable {
GroupMessage groupMessage
Integer detailId
String message
String url
static mapping = {
datasources(['ds1'])
table 't_group_msg_det'
version false
id composite: ['groupMessage', 'detailId'], generator: 'assigned'
columns {
groupMessage {
column name: 'grpid'
column name: 'msgid'
}
detailId column:'id', type:int
message column:'sms'
url column:'url'
}
}

Answer 2

It's not possible using GORM configuration, but you can do it with a custom Configuration class:
package com.foo.bar;
import java.util.Collection;
import java.util.Iterator;
import org.codehaus.groovy.grails.orm.hibernate.cfg.DefaultGrailsDomainConfiguration;
import org.hibernate.MappingException;
import org.hibernate.mapping.Column;
import org.hibernate.mapping.PersistentClass;
import org.hibernate.mapping.RootClass;
public class CompositeAwareHibernateConfiguration extends DefaultGrailsDomainConfiguration {
private static final long serialVersionUID = 1;
private boolean _alreadyProcessed;
#SuppressWarnings("unchecked")
#Override
protected void secondPassCompile() throws MappingException {
super.secondPassCompile();
if (_alreadyProcessed) {
return;
}
for (PersistentClass pc : (Collection<PersistentClass>)classes.values()) {
if (pc instanceof RootClass) {
RootClass root = (RootClass)pc;
if ("com.foo.bar.Order".equals(root.getClassName())) {
for (Iterator iter = root.getTable().getColumnIterator(); iter.hasNext(); ) {
Column column = (Column)iter.next();
if ("catalog_name".equals(column.getName())) {
column.setName("cat_name");
}
else if ("catalog_manufacturer_id".equals(column.getName())) {
column.setName("manuf_id");
}
}
}
}
}
_alreadyProcessed = true;
}
}
Put the class in src/java and register it in DataSource.groovy:
dataSource {
pooled = true
driverClassName = ...
username = ...
password = ...
configClass = com.foo.bar.CompositeAwareHibernateConfiguration
}

Answer 3

I have write a solution that is for any domain-class that need it and you don't need readapt every time.
class Catalog {
static mapping = {
id composite:['name', 'manufacturer']
columns {
name column:'cat_name'
manufacturer column:'manuf_id'
}
}
String name
Manufacturer manufacturer
}
class Order {
Catalog catalog
static mapping = {
}
static foreigners = [
catalog : [name : "catalog_name",
manufacturer: "catalog_manufacturer_name"]
]
}
This is the GORM Configuration class that i write to consume the foreigners in the domain class.
package my.app.package
import java.util.Collection;
import org.codehaus.groovy.grails.orm.hibernate.cfg.GrailsAnnotationConfiguration;
import org.hibernate.MappingException;
import org.hibernate.mapping.Column;
import org.hibernate.mapping.ForeignKey;
import org.hibernate.mapping.PersistentClass;
import org.hibernate.mapping.RootClass;
class MyCustomGrailsAnotationConfiguration extends GrailsAnnotationConfiguration{
private static final long serialVersionUID = 1;
private boolean _alreadyProcessed=false;
#SuppressWarnings("unchecked")
#Override
protected void secondPassCompile() throws MappingException {
super.secondPassCompile();
if(_alreadyProcessed){
return;
}
classes.values().each{rootClass ->
if(rootClass instanceof RootClass){
def domainClass= null
Boolean hasForeigners=false
try{
domainClass=Class.forName(rootClass.entityName,false,Thread.currentThread().getContextClassLoader())
hasForeigners = domainClass.metaClass.hasProperty(domainClass, 'foreigners')
}catch(Exception e){}
if(domainClass && hasForeigners){
rootClass?.table?.foreignKeyIterator?.each{fKey->
fKey?.columnIterator?.each{column->
domainClass.foreigners?.each{attrName,columns ->
columns.each{columnItmName,columnItmValue->
def exp=attrName+"_"
columnItmName.split("").each{exp+=(it==~/[A-Z]/) ? "_"+it:it}
exp=exp.toLowerCase()+".(id)\$"
//println "Expression:"+exp
if(column.name.matches(exp)){
//println "Match:"+column.name+" changing to "+columnItmValue
column.name=columnItmValue
}
}
}
}
}
}
}
}
_alreadyProcessed = true;
}
}
Put the my.app.package.MyCustomGrailsAnotationConfiguration.groovy class in src/groovy/my/app/package/MyCustomGrailsAnotationConfiguration.groovy and register it in DataSource.groovy:
dataSource {
pooled = true
driverClassName = ...
username = ...
password = ...
configClass = my.app.package.MyCustomGrailsAnotationConfiguration
}
I hope that will useful for you.
Thanks #carlosmain for your help