address1 := Address{Name: "address 1"}
	address2 := Address{Name: "address 2"}
	DB.Save(&address1).Save(&address2)

	DB.Create(&PersonAddress{PersonID: person1.ID, AddressID: int(address1.ID)})
	DB.Create(&PersonAddress{PersonID: person1.ID, AddressID: int(address2.ID)})
	DB.Create(&PersonAddress{PersonID: person2.ID, AddressID: int(address1.ID)})

	var personAddressInfoList []*PersonAddressInfo
	if err := DB.Select("people.*, addresses.*").

			References: []Reference{
				{"ID", "Person", "PersonID", "likes", "", true},
				{"ID", "Thing", "ThingID", "likes", "", false},
			},
		},
		Relation{
			Name: "Dislikes", Type: schema.Many2Many, Schema: "Person", FieldSchema: "Thing",
			JoinTable: JoinTable{Name: "dislikes", Table: "dislikes"},
			References: []Reference{
				{"ID", "Person", "PersonID", "dislikes", "", true},

            return Collections.emptyList();
        }
    }

    // visible for testing
    static String deriveId(Map<String, String> values) {
        return values.get("ID") + "-" + values.get("VERSION_ID");
    }

    // visible for testing
    static Map<String, String> parseOsRelease(final List<String> osReleaseLines) {
        final Map<String, String> values = new HashMap<>();