neilabdev opened a new issue, #14621:
URL: https://github.com/apache/grails-core/issues/14621

   
   Thanks for the great work! Just a hope for a future enhancement. But 
basically, it would be nice to be able to add conditions to a joinTable, based 
on instance values or hard coded values on column names.  I've used it in rails 
several times, and my projects where I use Grails mostly, the ability is sorely 
missed. See example below:
   
   ```groovy
   
   class Employee {
       static hasMany = [projects: Project]
   
       static mapping = {
           projects joinTable: [name: 'EMP_PROJ',
                                column: 'PROJECT_ID',
                                key: 'EMPLOYEE_ID', where: {->
               [type_column: this.some_discriminator_column_of_this_instance]
           }
       }
   }
   ```
   
   


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