REAL or INTEGER column values from db that are NULL, getter returns 0.0 or 0

DBFlow Version: 4.0.3 Issue Kind (Bug, Question, Feature): Bug

Description: When I do a Select on a table with columns REAL or INTEGER that are nullable, if the row values are NULL for those columns when I call the getter for the values of those columns I get 0 by default instead of NULL. This issue only occurs to me after I migrated from dbflow 3.1.1 to 4.0.3.

Example Table:

@Table(name = "schedule_work", 
database = ISDatabase.class, 
primaryKeyConflict = ConflictAction.REPLACE, 
insertConflict = ConflictAction.REPLACE, 
updateConflict = ConflictAction.REPLACE)
public class ScheduleWork extends BaseModel {

    @PrimaryKey
    @Column(name = "schedule_work_id")
    @SerializedName("schedule_work_id")
    @Expose
    private Integer scheduleWorkId;

    @Column(name = "work_name")
    @SerializedName("work_name")
    @Expose
    private String workName;

    @Column(name = "failure_id")
    @SerializedName("failure_id")
    @Expose
    private Integer failureId;

    /**
     * No args constructor for use in serialization
     */
    public ScheduleWork() {
        super();
    }

    /**
     * @return The scheduleWorkId
     */
    public Integer getScheduleWorkId() {
        return scheduleWorkId;
    }

    /**
     * @param scheduleWorkId The schedule_work_id
     */
    public void setScheduleWorkId(Integer scheduleWorkId) {
        this.scheduleWorkId = scheduleWorkId;
    }

    public ScheduleWork withScheduleWorkId(Integer scheduleWorkId) {
        this.scheduleWorkId = scheduleWorkId;
        return this;
    }

    /**
     * @return The workName
     */
    public String getWorkName() {
        return workName;
    }

    /**
     * @param workName The work_name
     */
    public void setWorkName(String workName) {
        this.workName = workName;
    }

    public ScheduleWork withWorkName(String workName) {
        this.workName = workName;
        return this;
    }

    public Integer getFailureId() {
        return failureId;
    }

    public void setFailureId(Integer failureId) {
        this.failureId = failureId;
    }
}

The query:

new Select().from(ScheduleWork.class)
    .where(ScheduleWork_Table.failure_id.withTable().isNull()).async()
    .queryListResultCallback(callback).execute();

On the callback I call getFailureId() on an entry and I obtain 0 instead of null. Or just by doing:

List<ScheduleWork> swl = new Select().from(ScheduleWork.class)
    .where(ScheduleWork_Table.failure_id.isNull()).queryList();
for(ScheduleWork sw : swl)
    Log.e("Debug", "MY FAILURE_ID: "+sw.getFailureId());

I get the output: MY FAILURE_ID: 0

[olehbozhko]

I found a good temporary solution while awaiting to fix it on DbFlow lib. developers side. I added four converters to avoid using standard functionality. It is also possible to use String in converters as db type but in this case is possible to face problem with Primary keys and default values.

@com.raizlabs.android.dbflow.annotation.TypeConverter
public class IntegerConverter extends TypeConverter<Integer, Integer> {

    @Override
    public Integer getDBValue(Integer model) {
        return model;
    }

    @Override
    public Integer getModelValue(Integer data) {
        return data;
    }

@com.raizlabs.android.dbflow.annotation.TypeConverter
public class LongConverter extends TypeConverter<Long, Long> {

    @Override
    public Long getDBValue(Long model) {
        return model;
    }

    @Override
    public Long getModelValue(Long data) {
        return data;
    }
}

@com.raizlabs.android.dbflow.annotation.TypeConverter
public class FloatConverter extends TypeConverter<Float, Float> {

    @Override
    public Float getDBValue(Float model) {
        return model;
    }

    @Override
    public Float getModelValue(Float data) {
        return data;
    }
}

@com.raizlabs.android.dbflow.annotation.TypeConverter
public class DoubleConverter extends TypeConverter<Double, Double> {

    @Override
    public Double getDBValue(Double model) {
        return model;
    }

    @Override
    public Double getModelValue(Double data) {
        return data;
    }
}

[agrosner]

fixed in develop. should be in 4.0.4