Kalıtım haritalandırmasında discriminator sorunu Ben aşağıda açıklanan kalıtım eşlemesi ile 4 sınıf A, B, B1, B2 var:
A (Tablo A ile eşleştirilen) en üstteki üst sınıf ve onun miras eşleme stratejisidir tablePerHierarchy=false
(alt sınıflarının her biri tek bir tabloyla eşleştirilir).
B Sınıfı A ve B1, B2 B'den uzar. B1 ve B2 aynı tabloyu B ile paylaşır, bu nedenle B sınıfında, tablePerHierarchy=true
ve B1 ve B2'yi ayırmak için bir ayırıcı beyan ederim. Grails
class A {
static mapping = {
tablePerHierarchy false
table 'A'
}
}
class B extends A {
static mapping = {
tablePerHierarchy true
table 'B'
discriminator column : 'TYPE'
}
String bProp1
String bProp2
}
class B1 extends B {
static mapping = {
discriminator column : 'TYPE', value : 'B1'
}
String b1Props1
String b1Props2
}
class B2 extends B {
static mapping = {
discriminator column : 'TYPE', value : 'B2'
}
String b2Props1
String b2Props1
}
Uygulamamı başlatmak
bir hata oluştu var:detay kodu burada
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'messageSource': 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: No discriminator found for edu.test.B1. Discriminator is needed when 'single-table-per-hierarchy' is used and a class has subclasses
at org.grails.tomcat.TomcatServer.start(TomcatServer.groovy:212)
at grails.web.container.EmbeddableServer$start.call(Unknown Source)
at _GrailsRun_groovy$_run_closure5_closure12.doCall(_GrailsRun_groovy:158)
at _GrailsRun_groovy$_run_closure5_closure12.doCall(_GrailsRun_groovy)
at _GrailsSettings_groovy$_run_closure10.doCall(_GrailsSettings_groovy:280)
at _GrailsSettings_groovy$_run_closure10.call(_GrailsSettings_groovy)
at _GrailsRun_groovy$_run_closure5.doCall(_GrailsRun_groovy:149)
at _GrailsRun_groovy$_run_closure5.call(_GrailsRun_groovy)
at _GrailsRun_groovy.runInline(_GrailsRun_groovy:116)
at _GrailsRun_groovy.this$4$runInline(_GrailsRun_groovy)
at _GrailsRun_groovy$_run_closure1.doCall(_GrailsRun_groovy:59)
at RunApp$_run_closure1.doCall(RunApp:33)
at gant.Gant$_dispatch_closure5.doCall(Gant.groovy:381)
at gant.Gant$_dispatch_closure7.doCall(Gant.groovy:415)
at gant.Gant$_dispatch_closure7.doCall(Gant.groovy)
at gant.Gant.withBuildListeners(Gant.groovy:427)
at gant.Gant.this$2$withBuildListeners(Gant.groovy)
at gant.Gant$this$2$withBuildListeners.callCurrent(Unknown Source)
at gant.Gant.dispatch(Gant.groovy:415)
at gant.Gant.this$2$dispatch(Gant.groovy)
at gant.Gant.invokeMethod(Gant.groovy)
at gant.Gant.executeTargets(Gant.groovy:590)
at gant.Gant.executeTargets(Gant.groovy:589)
Caused by: 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: No discriminator found for edu.test.B1. Discriminator is needed when 'single-table-per-hierarchy' is used and a class has subclasses
... 23 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Invocation of init method failed; nested exception is org.hibernate.MappingException: No discriminator found for edu.test.B1. Discriminator is needed when 'single-table-per-hierarchy' is used and a class has subclasses
... 23 more
Caused by: org.hibernate.MappingException: No discriminator found for edu.test.B1. Discriminator is needed when 'single-table-per-hierarchy' is used and a class has subclasses
... 23 more
ben discriminator (http://grails.org/doc/latest/ref/Database%20Mapping/discriminator.html) hakkında Grails belgelerin talimat takip ama etmedi iş. Bu belge sorunuyla ilgili bir JIRA'yı burada buldum: http://jira.grails.org/browse/GRAILS-5168 ve yorum yazdıkları gibi kodlarımı düzelttim ama yine de aynı hatayı aldım.
Bu soruna neden olan sebebi bilmiyorum. TablePerHierarchy = B'de true, A'da tanımlanan stratejiyi geçersiz kılar mı?
Bu sorunu düzeltmeme yardımcı olabilir misiniz? Çok teşekkür ederim.
kabul edilen yanıtları işaretlemelisiniz – dbrin