Android Room Persistence Library - Many to Many Relation - database

Question

I am trying to achieve many-to-many relationship in Room Persistence Library. I am trying to create a Notes App with Tags.
The idea is:
A note will have multiple tags.
A tag will have multiple notes.
Show all notes in RecyclerView along with Tags.
To achieve this, I have created two models Note.java, Tag.java and TagJoin model to store the relationship b/w notes and tags. Achieving one-to-one is very easy using #Relation annotation.
Here are my models
#Entity(tableName = "notes")
public class Note {
#PrimaryKey
#NonNull
public final String id;
#ColumnInfo(name = "note")
public String note;
#Ignore
public List<Tag> tags;
#Ignore
public Note(String note) {
this(UUID.randomUUID().toString(), note);
}
public Note(String id, String note) {
this.id = id;
this.note = note;
}
public String getId() {
return id;
}
public String getNote() {
return note;
}
public void setNote(String note) {
this.note = note;
}
public List<Tag> getTags() {
return tags;
}
public void setTags(List<Tag> tags) {
this.tags = tags;
}
#Entity(tableName = "note_tag_join",
primaryKeys = {"noteId", "tagId"},
foreignKeys = {
#ForeignKey(
entity = Note.class,
parentColumns = "id",
childColumns = "noteId",
onDelete = CASCADE),
#ForeignKey(
entity = Tag.class,
parentColumns = "id",
childColumns = "tagId",
onDelete = CASCADE)},
indices = {
#Index(value = "noteId"),
#Index(value = "tagId")
}
)
public static class TagJoin {
#NonNull
public final String noteId;
#NonNull
public final String tagId;
public TagJoin(String noteId, String tagId) {
this.noteId = noteId;
this.tagId = tagId;
}
}
}
Tags Model:
#Entity(tableName = "tags", indices = {#Index(value = "name", unique = true)})
public class Tag {
#PrimaryKey
#NonNull
public String id;
#ColumnInfo(name = "name")
public String name;
#Ignore
public Tag(String name) {
this(UUID.randomUUID().toString(), name);
}
public Tag(String id, String name) {
this.id = id;
this.name = name;
}
public String getId() {
return id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
Notes Dao:
#Dao
public interface NoteDao {
#Query("SELECT * FROM notes ORDER BY id DESC")
LiveData<List<Note>> getAllNotes();
#Insert
long insert(Note note);
#Update
void update(Note note);
#Delete
void delete(Note note);
#Query("DELETE FROM notes")
void deleteAll();
#Query("SELECT COUNT(*) FROM notes")
int getNotesCount();
#Query("SELECT notes.* FROM notes\n" +
"INNER JOIN note_tag_join ON notes.id=note_tag_join.noteId\n" +
"WHERE note_tag_join.tagId=:tagId")
List<Note> getAllNotesOfTag(String tagId);
#Insert
void insert(Note.TagJoin... joins);
#Delete
void delete(Note.TagJoin... joins);
}
So far everything is good. Now I want to show the Notes in RecyclerView but I can't find a way to fetch all Notes along with Tags at once. One way is, getting the tags of each note in onBindViewHolder method which I think is wrong as we have to query the db each time row is displayed.
Please provide me suggestions.
PS: I have followed the code provided in this article
https://commonsware.com/AndroidArch/previews/mn-relations-in-room