allow sorting by total chapters for library view (#811)

* allow sorting by total chapters for library view

* allow sorting by total chapters for library view

* Changed to remove query per manga.

app/src/main/java/eu/kanade/tachiyomi/data/database/queries/MangaQueries.kt

@@ -98,4 +98,7 @@ interface MangaQueries : DbProvider {
                     .observesTables(MangaTable.TABLE)
                     .build())
             .prepare()
+
+    fun getTotalChapterManga() = db.get().listOfObjects(Manga::class.java)
+            .withQuery(RawQuery.builder().query(getTotalChapterMangaQuery()).observesTables(MangaTable.TABLE).build()).prepare();
 }

app/src/main/java/eu/kanade/tachiyomi/data/database/queries/RawQueries.kt

@@ -93,6 +93,15 @@ fun getLastReadMangaQuery() = """
     ORDER BY max DESC
 """
 
+fun getTotalChapterMangaQuery()= """
+    SELECT ${Manga.TABLE}.*
+    FROM ${Manga.TABLE}
+    JOIN ${Chapter.TABLE}
+    ON ${Manga.TABLE}.${Manga.COL_ID} = ${Chapter.TABLE}.${Chapter.COL_MANGA_ID}
+    GROUP BY ${Manga.TABLE}.${Manga.COL_ID}
+    ORDER by COUNT(*)
+"""
+
 /**
  * Query to get the categories for a manga.
  */