Migration AlterTable Add new column not work?

Hi @graiz , I have a table

@Table(databaseName = MyDatabase.NAME)
@ModelContainer
public class Lead extends BaseModel {

    @Column
    @PrimaryKey
    @Expose
    String objectId;

    @Column
    @Expose
    String name;
}

Now I want to add new column into this table, I do following step:

1. Add new column into Lead.class

@Table(databaseName = MyDatabase.NAME)
@ModelContainer
public class Lead extends BaseModel {

    @Column
    @PrimaryKey
    @Expose
    String objectId;

    @Column
    @Expose
    String name;

    @Column
    @Expose
    String otherInfos;
}

1. Create Migration:

@Migration(version = 4, databaseName = MyDatabase.NAME)
public class Migration1 extends AlterTableMigration<Lead> {

    public Migration1() {
        super(Lead.class);
    }

    public Migration1(Class<Lead> table) {
        super(table);
    }

    @Override
    public void onPreMigrate() {
        super.onPreMigrate();
        addColumn(String,class, Lead$Table.OTHERINFOS);
    }
}

but It returns error:

android.database.sqlite.SQLiteException: no such column: otherInfos (code 1):

Can you help me to solve this?

Thanks a lot!!

[voghDev]

I was having a stupid mistake that made me waste hours. I just want you guys to know, to avoid someone from doing the same. The error I was getting is:

Process: com.company.app.flavor, PID: 6381
java.lang.RuntimeException: java.lang.NullPointerException
at com.raizlabs.android.dbflow.runtime.DBTransactionQueue.run(DBTransactionQueue.java:75)
Caused by: java.lang.NullPointerException

The reason: I was passing an unassigned String to addColumn. Imagine this:

public static final String STR;

@Override
public void onPreMigrate() {
    super.onPreMigrate();

    addColumn(String.class, STR);
}

I know it’s a dumb issue, but I wasted several hours finding it. Maybe it helps someone else.

[narimetisaigopi]

remove

public Migration1() { super(Lead.class); } one constructor is enough if not it gives an error

incremnet your database version number and use version = Mydatabase.VERSION;