groovy grails构建测试数据（buildtestdata插件）如何创建多对多

Question

使用 Grails 2.2.4。和构建测试数据：2.0.5。我无法使用 conf - Bootstrap.groovy 在数据库中添加多对多实例。使用 MySQL 作为数据库。

这是简化的域类：

class Reseller {
String resellerName
static hasMany = [addresses: Address]

}

和

class Address {
String address1 
static hasMany = [resellers: Reseller]
static belongsTo = [Reseller]   

}

这会导致在运行时在 MySQL 中创建...

（下面是一个简单的 ER 图，因为我无法从 MySQL Workbench Diagram 发布图像）

经销商 ==> 1 对多==> reseller_address

如果不存在则创建表 address ( id bigint(20) NOT NULL AUTO_INCREMENT, version bigint(20) 非空， address1 varchar(255) 非空， 主键 (id) ) ENGINE=InnoDB 默认字符集=utf8 AUTO_INCREMENT=1 ;

如果不存在则创建表 reseller ( id bigint(20) NOT NULL AUTO_INCREMENT, version bigint(20) 非空， reseller_name varchar(255) 非空， 主键 (id) ) ENGINE=InnoDB 默认字符集=utf8 AUTO_INCREMENT=2 ;

如果不存在则创建表 reseller_addresses ( address_id bigint(20) 非空， reseller_id bigint(20) 非空， 主键 (reseller_id,address_id), 键FK3F39FB15CB44906F (reseller_id), 键FK3F39FB1541937EA5 (address_id) ) ENGINE=InnoDB 默认字符集=utf8;

更改表reseller_addresses 添加约束FK3F39FB1541937EA5外键（address_id）参考address（id）， 添加约束 FK3F39FB15CB44906F 外键 (reseller_id) 引用 reseller (id);

这是 Bootstrap.groovy：

    import grails.buildtestdata.mixin.Build
import manytomany.*

class BootStrap {

    def init = { servletContext ->
        Address ad1 = Address.build()
        Reseller rs1 = Reseller.build()

        //comment out next line to run and see tables being built.
        rs1.addToAddresses(address: ad1) //does not work.  see error below                      
    }
    def destroy = {
    }
}

上面的结果会导致下面的错误。它还导致数据库中的零表在 MySQL 中。我可以看到它们被创建，然后它们在下面的错误中消失。

    | Running Grails application
Hibernate: insert into address (version, address1) values (?, ?)
Hibernate: insert into reseller (version, reseller_name) values (?, ?)
| Error 2013-11-13 17:37:01,543 [localhost-startStop-1] ERROR hibernate.AssertionFailure  - an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session)
Message: null id in manytomany.Address entry (don't flush the Session after an exception occurs)
    Line | Method
->>  334 | innerRun  in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    166 | run       in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run . . . in java.lang.Thread
| Error 2013-11-13 17:37:01,628 [localhost-startStop-1] ERROR context.GrailsContextLoader  - Error initializing the application: null id in manytomany.Address entry (don't flush the Session after an exception occurs)
Message: null id in manytomany.Address entry (don't flush the Session after an exception occurs)
    Line | Method
->>  334 | innerRun  in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    166 | run       in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run . . . in java.lang.Thread

Answer 1

试试这个方法，你可以通过.build(...)把你的关联传递给父类：

def init = { servletContext ->
    Address ad1 = Address.build()
    Reseller rs1 = Reseller.build(addresses:[ad1])
} 

文档：https://github.com/tednaleid/build-test-data/wiki/SampleCode