How to avoid ImprovedNamingStrategy in joinTable in Grails - grails-orm

Question

I have a legacy database which I can't change and I have this setup
class Foo {
static hasMany = [bars:Bar]
static mapping = {
version false
columns {
id column: "FooId"
color column: "FooColor"
bars joinTable: [name: "FooBar", key: 'FooId', column: 'BarId']
}
transient
def getBarName(){
((Bar)this.bars.toArray()[0]).name
}
}
class Bar {
static hasMany = [foos:Foo]
static belongsTo = [Foo, Baz]
static mapping = {
version false
columns {
id column: "BarId"
name column: "BarName"
}
}
When i try to access the method getBarName() in a controller Hibernate translates the inverse column name to "bar_id". Is there some way to set up a mapping like the one for the id and property columns?
And on a side note. How do i correctly implement getBarName()? Thacan't possibly be the correct implementation...
*EDIT*
----------------------------------------------------------------------
Apparently I was unclear above. The thing is that i already have a join column which has the form
-------------------
|RowId|FooId|BarId|
-------------------
| 1 | abc | 123 |
-------------------
Benoit's answer isn't really applicable in this situation since I want to avoid having a domain object for the joinTable.
*EDIT 2*
----------------------------------------------------------------------
Solved it. Dont understand it though... But split the join table information between the two domain classes and it works...
class Foo {
static hasMany = [bars:Bar]
static mapping = {
version false
columns {
id column: "FooId"
color column: "FooColor"
bars joinTable: [name: "FooBar", key: 'FooId']
}
transient
def getBarName(){
((Bar)this.bars.toArray()[0]).name
}
}
class Bar {
static hasMany = [foos:Foo]
static belongsTo = [Foo, Baz]
static mapping = {
version false
columns {
id column: "BarId"
name column: "BarName"
bars joinTable: [name: "FooBar", key: 'BarId']
}
}

Answer 1

As stated in the documentation Many-to-One/One-to-One Mappings and One-to-Many Mapping :
With a bidirectional one-to-many you can change the foreign key column
used by changing the column name on the many side of the association
as per the example in the previous section on one-to-one associations.
However, with unidirectional associations the foreign key needs to be
specified on the association itself.
Thye given example is:
class Person {
String firstName
static hasMany = [addresses: Address]
static mapping = {
table 'people'
firstName column: 'First_Name'
addresses column: 'Person_Address_Id'
}
}