org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : com.cloud4store.estate.models.core.Room.property -> com.cloud4store.estate.models.core.Property
	at org.hibernate.engine.spi.CascadingActions$8.noCascade(CascadingActions.java:380)
	at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:165)
	at org.hibernate.event.internal.AbstractSaveEventListener.cascadeBeforeSave(AbstractSaveEventListener.java:428)
	at org.hibernate.event.internal.DefaultPersistEventListener.justCascade(DefaultPersistEventListener.java:174)
	at org.hibernate.event.internal.DefaultPersistEventListener.entityIsPersistent(DefaultPersistEventListener.java:167)
	at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:131)
	at org.hibernate.internal.SessionImpl.firePersistOnFlush(SessionImpl.java:860)
	at org.hibernate.internal.SessionImpl.persistOnFlush(SessionImpl.java:853)
	at org.hibernate.engine.spi.CascadingActions$8.cascade(CascadingActions.java:341)
	at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:490)
	at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:415)
	at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:216)
	at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:523)
	at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:455)
	at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:418)
	at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:216)
	at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:149)
	at org.hibernate.event.internal.AbstractFlushingEventListener.cascadeOnFlush(AbstractFlushingEventListener.java:159)
	at org.hibernate.event.internal.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:150)
	at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:83)
	at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:38)
	at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1454)