GRAILS: Using Domain subclasses

Question

Using Grails with the following versions:

APPLICATION STATUS
App version: 0.1
Grails version: 2.3.5
Groovy version: 2.1.9
JVM version: 1.7.0_51
Reloading active: true
Controllers: 15
Domains: 18
Services: 2
Tag Libraries: 13

I have a domain model that I am trying to follow. I built the tables in MySQL prior to programming.
In the model, I have Insertion_orders that are bound to people (Persons) in a Many-to-Many relationship. This relationship is defined by Insertion_orders_persons, with the person_id & location_id defining an entry in Insertion_orders_persons. In addition there is a type value that is ENUMed either Trafficker, Advertiser, Agency, (or) Salesperson. One (or more) trafficker will always appear, but the rest may, may not or have many of these associations. I am trying to bind them according to type to the Insertion_orders model:

package cms


class Insertion_orders {
    String insertion_order_name
    String po_number
    String notes
    String toString() {
        "${insertion_order_name} - ${id}"
    }

    static hasMany = [trafficker: Insertion_orders_traffickers, salesperson: Insertion_orders_salespersons]

    static constraints = {
        insertion_order_name(blank:false)
        po_number()
        notes(widget: 'textarea', nullable:true)
    }
    static mapping ={
        version false
        id column: 'insertion_order_id'
        notes sqlType: 'text'
    }
}

I am trying to use inheritance and a discrimiator value to accomplish this.

package cms

class Insertion_orders_persons {
    Persons person
    Insertion_orders insertion_order
    Type type
    String toString() {
        "${person}: ${type}"
    }

    enum Type {
        Trafficker, Salesperson, Advertiser, Agency
    }

    static constraints = {
    }
    static mapping = {
        version false
        id column: 'insertion_order_person_id'
        discriminator column: "type"        
    }

}

class Insertion_orders_traffickers extends Insertion_orders_persons {
    static mapping ={
        discriminator value: "Traffickers"
    }
}

class Insertion_orders_salespersons extends Insertion_orders_persons {
    static mapping ={
        discriminator value: "Salesperson"
    }
}

The problem is that when I try to join to the extended classes (as in the hasMany in the Insertion_orders class), the Grails fails to start and generates the following:

|Loading Grails 2.3.5
|Configuring classpath
.
|Environment set to development
.................................
|Packaging Grails application
..........................................
|Running Grails application
Error |
2014-04-16 11:33:58,693 [localhost-startStop-1] ERROR context.GrailsContextLoader  - Error initializing the application: 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: cms.Insertion_orders_salespersons
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: cms.Insertion_orders_salespersons
    Line | Method
->>  262 | run       in java.util.concurrent.FutureTask
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    744 | run       in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Invocation of init method failed; nested exception is org.hibernate.MappingException: Association references unmapped class: cms.Insertion_orders_salespersons
->>  262 | run       in java.util.concurrent.FutureTask
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    744 | run       in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'sessionFactory': Invocation of init method failed; nested exception is org.hibernate.MappingException: Association references unmapped class: cms.Insertion_orders_salespersons
->>  262 | run       in java.util.concurrent.FutureTask
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    744 | run       in java.lang.Thread
Caused by MappingException: Association references unmapped class: cms.Insertion_orders_salespersons
->>  262 | run       in java.util.concurrent.FutureTask
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    744 | run       in java.lang.Thread
Error |
Forked Grails VM exited with error

As additional information, regardless of how I try to access the subclasses, or the subclass composition, I get the same error.

This seems like a very fundamental functionality. Can someone please tell me what I am missing or doing incorrectly?

Answer 1

如果您从Insertion_orders_persons中删除“ discriminator”列：“ type”，并在各自的源文件中分别定义Insertion_orders_persons，Insertion_orders_traffickers和Insertion_orders_salespersons，我认为您的代码将起作用。