Android Room Embedded Relation ignoruje SQL, gdzie warunek

Uważam, że jest to spowodowane albo martwym, prostym konwerterem, albo być może sposobem, w jaki jednostka elementu jest zdefiniowana (użyłem wartości boolean dla wykluczonych i wygląda na to, że działa dobrze bez konwertera) .

To używa mojej wersji jednostki przedmiotu :-

@Entity(foreignKeys = @ForeignKey(entity = Category.class,parentColumns = "id", childColumns = "category", onDelete =  CASCADE))
public class Items {
    @PrimaryKey(autoGenerate = true)
    private long id;
    private String category;
    private boolean isexcluded;


    public void setCategory(String category) {
        this.category = category;
    }

    public void setId(long id) {
        this.id = id;
    }

    public void setIsexcluded(boolean isexcluded) {
        this.isexcluded = isexcluded;
    }

    public String getCategory() {
        return this.category;
    }

    public long getId() {
        return this.id;
    }

    public boolean isIsexcluded() {
        return this.isexcluded;
    }
}

wraz z kategorią DAO :-

@Dao
interface CategoryDAO {
    @Query("SELECT * FROM Category")
    List<Category> getAllcategories();

    @Query("SELECT DISTINCT Category.* " +
            "FROM CATEGORY " +
            "INNER JOIN ITEMS ON category.id = Items.category " +
            "WHERE isexcluded = 0 " +
            "ORDER BY lower(category.name)")
    List<Category> getSpeacial();

    @Query("SELECT DISTINCT Category.* " +
            "FROM CATEGORY " +
            "INNER JOIN ITEMS ON category.id = Items.category " +
            "WHERE isexcluded = 0 " +
            "ORDER BY lower(category.name)")
    List<CatViewWithItemList> getSpeacial2();

    @Insert
    public long[] insertCategory(Category... Category);
}

wraz z

new Thread(new Runnable() {
            @Override
            public void run() {
                //mRoomDB.categoryDao().insertCategory(initialCategories());
                //mRoomDB.itemsDAO().insertItem(initialItems());
                List<Category> categoryList = mRoomDB.categoryDao().getAllcategories();
                List<Items> itemsList = mRoomDB.itemsDAO().getAllItems();
                for (Category c: categoryList) {
                    Log.d("CATEGORY","Category is " + c.getName() + " refrence is " + c.getId());
                }
                for (Items i: itemsList) {
                    Log.d("ITEM","Item is " + i.getId() + " Category reference is " + i.getCategory() + " Is Excluded is " + Boolean.toString(i.isIsexcluded()));
                }
                List<Category> categoryList2 = mRoomDB.categoryDao().getSpeacial();
                for (Category c: categoryList2) {
                    Log.d("CATEGORY2","Category is " + c.getName() + " reference is " + c.getId());
                }
                List<CatViewWithItemList> catViewWithItemLists = mRoomDB.categoryDao().getSpeacial2();
                for (CatViewWithItemList cvwil: catViewWithItemLists) {
                    Log.d("CATVIEWITEM","Category = " + cvwil.myCat.getId() + " ID = " + cvwil.ItemList.get(0).getId() + " IsExcluded = " + Boolean.toString(cvwil.ItemList.get(0).isIsexcluded()));
                }
            }
        }).start();

i z :-

public class CatViewWithItemList {

    @Embedded
    public Category myCat;

    @Relation(parentColumn = "id",
            entityColumn = "category")
    public List<Items> ItemList;
}

Wynik jest następujący (część pierwsza dane bazowe (och, więc nie mogę przeliterować trzeciej :))):-

2018-12-19 21:47:05.376 2109-2125/? D/CATEGORY: Category is firstname refrence is a
2018-12-19 21:47:05.377 2109-2125/? D/CATEGORY: Category is secondname refrence is b
2018-12-19 21:47:05.377 2109-2125/? D/CATEGORY: Category is thridname refrence is c
2018-12-19 21:47:05.377 2109-2125/? D/ITEM: Item is 1 Category reference is a Is Excluded is false
2018-12-19 21:47:05.377 2109-2125/? D/ITEM: Item is 2 Category reference is c Is Excluded is false
2018-12-19 21:47:05.377 2109-2125/? D/ITEM: Item is 3 Category reference is null Is Excluded is false
2018-12-19 21:47:05.377 2109-2125/? D/ITEM: Item is 4 Category reference is b Is Excluded is false
2018-12-19 21:47:05.377 2109-2125/? D/ITEM: Item is 5 Category reference is b Is Excluded is true
2018-12-19 21:47:05.378 2109-2125/? D/ITEM: Item is 6 Category reference is null Is Excluded is true

a następnie dwa zestawy wyników :-

2018-12-19 21:47:05.379 2109-2125/? D/CATEGORY2: Category is firstname reference is a
2018-12-19 21:47:05.380 2109-2125/? D/CATEGORY2: Category is secondname reference is b
2018-12-19 21:47:05.380 2109-2125/? D/CATEGORY2: Category is thridname reference is c


2018-12-19 21:47:05.382 2109-2125/? D/CATVIEWITEM: Category = a ID = 1 IsExcluded = false
2018-12-19 21:47:05.382 2109-2125/? D/CATVIEWITEM: Category = b ID = 4 IsExcluded = false
2018-12-19 21:47:05.382 2109-2125/? D/CATVIEWITEM: Category = c ID = 2 IsExcluded = false

Dodatkowe

Uważam, że Twój problem nie dotyczy zapytania, ale CatViewItemList w tym, że wypełniasz listę przedmiotów wszystkimi przedmiotami powiązanymi z kategorią niezależnie/po zapytaniu (tak sądzę, że umieszczasz listę przedmiotów w kategorii). To mnie zmyliło, ponieważ naprawdę chcesz tylko konkretnego powiązanego przedmiotu (właśnie złapałem pierwszy w moim kodzie), np. cvwil.ItemList.get(0).isIsexcluded() szczęście polegało na tym, że 4 jest przed 5, więc wykluczenie jest wyświetlane jako fałszywe.

Uważam, że być może powinieneś podejść do tego od pozycji Pozycje, dołączając do Kategorii m.in. coś w stylu

SELECT * 
FROM Items 
JOIN Category ON Items.category = category.id
WHERE Items.isexcluded = 0 
ORDER BY category.name ASC;

Otrzymam zaktualizowany kod na gitHub, aby to zrobić (pamiętaj, że zmieniłem tabelę kategorii tak, aby miała unikalną nazwę kolumny categoryid zamiast id.)

wyniki są teraz (uwaga:dodano kolejną kategorię i 2 kolejne przedmioty w odwróconej kolejności, tj. pierwszy przedmiot (id 7) został wykluczony jako prawda, a następnie id 8 ma fałsz) :-

2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/CATEGORY: Category is firstname Category ID is a
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/CATEGORY: Category is secondname Category ID is b
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/CATEGORY: Category is thirdname Category ID is c
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/CATEGORY: Category is fourthname Category ID is d
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 1 Category reference is a Is Excluded is false
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 2 Category reference is c Is Excluded is false
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 3 Category reference is null Is Excluded is false
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 4 Category reference is b Is Excluded is false
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 5 Category reference is b Is Excluded is true
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 6 Category reference is null Is Excluded is true
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 7 Category reference is d Is Excluded is true
2018-12-20 21:39:56.971 9136-9160/so53839431.so53839431roomrelationship D/ITEM: Item is 8 Category reference is d Is Excluded is false
2018-12-20 21:39:56.972 9136-9160/so53839431.so53839431roomrelationship D/ITEMWITHCAT: Item id =1 Category reference is a Is Excluded is false Referenced Category is a Referenced Category name is firstname
2018-12-20 21:39:56.972 9136-9160/so53839431.so53839431roomrelationship D/ITEMWITHCAT: Item id =2 Category reference is c Is Excluded is false Referenced Category is c Referenced Category name is thirdname
2018-12-20 21:39:56.972 9136-9160/so53839431.so53839431roomrelationship D/ITEMWITHCAT: Item id =4 Category reference is b Is Excluded is false Referenced Category is b Referenced Category name is secondname
2018-12-20 21:39:56.972 9136-9160/so53839431.so53839431roomrelationship D/ITEMWITHCAT: Item id =8 Category reference is d Is Excluded is false Referenced Category is d Referenced Category name is fourthname