I have a select query in Room DB that collect data from multiple tables, so I created a custom data ...

# android

[AmrJyniat]

I have a select query in Room DB that collect data from multiple tables, so I created a custom data class suitable for those returned data, now, I want to add an extra attribute to the class without returning it from the query, when I added the extraAtt I got a compiler error, how do I deal with that?

data class MyClass(val a: Int, val b: int, val extraAtt: Int)
------------
@Query("select a, b from tableName")
fun getData(): List<MyClass>

@ignore doesn't help me

[Ameen Essa]

Did you update the Database Version with Migration Option!

[AmrJyniat]

No. I figured out the solution, I should annotate the class with @JvmOverloads and give the extraAtt a default value!

[Zaki Shaikh]

I think you should call fallBackToDestructibeMigration on creating retrofit instance this may help.