java - Android Room property validate before saving to the database?

Question

I have a entity as follows

@Entity
data class User(
    @PrimaryKey 
    var id: String,

    var firstName: String,

    var lastName: String
) 

Lets say the accepted firstName and lastName are strings which should be strictly ASCII, How can I create a validation before saving to database, or do some pre processing when saving the data ?

The question is about having a validator to validate the data not just an ASCII check.

question from:https://stackoverflow.com/questions/65867499/android-room-property-validate-before-saving-to-the-database

Answer 1

You can make the Dao as an abstract class, the actual saving is where you run the query, but you call it from another method.

@Dao
public abstract class UserDao {
    public void insert(User user){
       if(yourCondition){
         insertInternal(user);
       }
    }
    @Insert(onConflict = OnConflictStrategy.REPLACE)
    void insertInternal(User user);
}