Credo che sia dovuto al tuo convertitore semplice morto o forse al modo in cui viene definita l'entità Items (ho usato boolean per escluso e sembra funzionare bene senza il convertitore) .
Questo sta usando la mia versione di Items Entity :-
@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;
}
}
insieme a una categoria DAO di :-
@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);
}
insieme a
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();
e con :-
public class CatViewWithItemList {
@Embedded
public Category myCat;
@Relation(parentColumn = "id",
entityColumn = "category")
public List<Items> ItemList;
}
Quindi il risultato è (prima parte i dati sottostanti (oh, quindi non posso scrivere il terzo :))):-
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
e poi le due serie di risultati :-
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
Ulteriori
Credo che il tuo problema non sia con la query ma con CatViewItemList in quanto stai riempiendo l'elenco di elementi con tutti gli elementi relativi alla categoria indipendentemente dalla query (ovvero, incorporando l'elenco di elementi nella categoria). Questo mi ha confuso perché vuoi davvero solo l'articolo correlato specifico (ho appena preso il primo nel mio codice), ad es. cvwil.ItemList.get(0).isIsexcluded() e la fortuna è che 4 viene prima di 5, quindi isexcluded appare come falso.
Credo che forse dovresti avvicinarti a questo dagli Articoli, unendoti alla Categoria ad es. qualcosa come
SELECT *
FROM Items
JOIN Category ON Items.category = category.id
WHERE Items.isexcluded = 0
ORDER BY category.name ASC;
Ho aggiornato il codice su gitHub per farlo (nota che ho cambiato la tabella delle categorie per avere un nome di colonna univoco di categoryid anziché id.)
i risultati sono ora (nota aggiunta un'altra categoria e altri 2 elementi in ordine invertito, ovvero il primo elemento (id 7) è stato escluso come vero, quindi l'id 8 ha falso) :-
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
