CODEWITHSUNDEEP
orm
Bartos
Bartos

Reputation: 1037

OrmLite Foreign Collection to List

I try to use foreign collections in ORMLite. However, I dont know how to convert it into list. I try to do something like this :

public class Car implements Serializable {
@DatabaseField(columnName = "carId" , generatedId = true, id=true)
private int id;
@DatabaseField(columnName = "carNumber")
private String mNumber;
@DatabaseField(columnName = "carName")
private String mName;
@ForeignCollectionField(eager = true,columnName = "carParts")
private Collection<Part> mParts;

ArrayList<Part> parts = new ArrayList<>(mParts);

public ArrayList<Part> getParts() {
        return parts;
    }

public void setParts(ArrayList<Part> parts) {
    this.parts = parts;
}

but when I try to use it I get exception :

java.lang.NullPointerException: collection == null

at this line : 

ArrayList<Part> parts = new ArrayList<>(mParts);

please, help.

Upvotes: 0

Views: 849

Answers (1)

Damian Nowakowski
Damian Nowakowski

Reputation: 11

The reason is simple - you have to wait until mParts will be initialized by ORMLite library, then you can create ArrayList from it.

public ArrayList<Part> getParts() {
   return new ArrayList<>( mParts );
}

Upvotes: 1

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