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ObjectBox: Efficiently remove orphaned entities left by dissolved ToOne relation

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0

Let's assume the following data model for ObjectBox (I'm using ObjectBox 2.3.4):

@Entity
class SomeEntity 

 @Id var id: Long = 0

 var otherEntityId: Long = 0

 lateinit var otherEntity: ToOne<OtherEntity?>


@Entity
class OtherEntity 
 @Id var id: Long = 0

If I remove the owning entity SomeEntity from its box, the OtherEntity is basically orphaned. Is there a way to efficiently find and remove those orphaned instances of OtherEntity?

I already thought about making the relation bi-directional by adding a ToOne<SomeEntity> to OtherEntity. The problem is that the relation isn't automatically managed during put so it's somewhat awkward to work with.

objectbox

share|improve this question

asked Mar 21 at 15:23

ahaaha

2,52112439

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  My first guess would be to check if SomeEntity has a otherEntity and remove it before removing SomeEntity? However, that won't work if multiple SomeEntity can link to the same OtherEntity. In that case you could add a backlink ToMany to OtherEntity. docs.objectbox.io/relations#one-to-many-1-n Though AFAIK there is no way to find OtherEntity where the ToMany is empty. I guess github.com/objectbox/objectbox-java/issues/677 could help with that.
  
  – Uwe - ObjectBox
  yesterday
  
  

  
  
  
  

add a comment | 

0

Let's assume the following data model for ObjectBox (I'm using ObjectBox 2.3.4):

@Entity
class SomeEntity 

 @Id var id: Long = 0

 var otherEntityId: Long = 0

 lateinit var otherEntity: ToOne<OtherEntity?>


@Entity
class OtherEntity 
 @Id var id: Long = 0

If I remove the owning entity SomeEntity from its box, the OtherEntity is basically orphaned. Is there a way to efficiently find and remove those orphaned instances of OtherEntity?

I already thought about making the relation bi-directional by adding a ToOne<SomeEntity> to OtherEntity. The problem is that the relation isn't automatically managed during put so it's somewhat awkward to work with.

objectbox

share|improve this question

asked Mar 21 at 15:23

ahaaha

2,52112439

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  My first guess would be to check if SomeEntity has a otherEntity and remove it before removing SomeEntity? However, that won't work if multiple SomeEntity can link to the same OtherEntity. In that case you could add a backlink ToMany to OtherEntity. docs.objectbox.io/relations#one-to-many-1-n Though AFAIK there is no way to find OtherEntity where the ToMany is empty. I guess github.com/objectbox/objectbox-java/issues/677 could help with that.
  
  – Uwe - ObjectBox
  yesterday
  
  

  
  
  
  

add a comment | 

Let's assume the following data model for ObjectBox (I'm using ObjectBox 2.3.4):

@Entity
class SomeEntity 

 @Id var id: Long = 0

 var otherEntityId: Long = 0

 lateinit var otherEntity: ToOne<OtherEntity?>


@Entity
class OtherEntity 
 @Id var id: Long = 0

If I remove the owning entity SomeEntity from its box, the OtherEntity is basically orphaned. Is there a way to efficiently find and remove those orphaned instances of OtherEntity?

I already thought about making the relation bi-directional by adding a ToOne<SomeEntity> to OtherEntity. The problem is that the relation isn't automatically managed during put so it's somewhat awkward to work with.

objectbox

share|improve this question

asked Mar 21 at 15:23

ahaaha

2,52112439

@Entity
class SomeEntity 

 @Id var id: Long = 0

 var otherEntityId: Long = 0

 lateinit var otherEntity: ToOne<OtherEntity?>


@Entity
class OtherEntity 
 @Id var id: Long = 0

share|improve this question

asked Mar 21 at 15:23

ahaaha

2,52112439

share|improve this question

asked Mar 21 at 15:23

ahaaha

2,52112439

asked Mar 21 at 15:23

ahaaha

2,52112439

asked Mar 21 at 15:23

ahaaha

2,52112439