VRFS-3681 fixed artist pagination

ruby/lib/jam_ruby/models/jam_track_search.rb

@@ -19,6 +19,7 @@ module JamRuby
     KEY_GENRES = 'genres'
     KEY_INSTRUMENTS = 'instruments'
     KEY_LANGUAGE = 'language'
+    KEY_ORIGINAL_ARTIST = 'original_artist'
 
     def self.json_schema
       return @@jschema ||= {
@@ -27,6 +28,7 @@ module JamRuby
           KEY_INSTRUMENTS => [],
           KEY_GENRES => [],
           KEY_LANGUAGE => '',
+          KEY_ORIGINAL_ARTIST => '',
           KEY_RESULT_TYPES => [],
           KEY_PAGE_NUM => 1,
           KEY_PER_PAGE => PER_PAGE,
@@ -77,6 +79,10 @@ module JamRuby
         end
       end
 
+      unless (artist_name = query[KEY_ORIGINAL_ARTIST]).blank?
+        rel = rel.where(original_artist: artist_name)
+      end
+
       rel
     end
 
@@ -90,7 +96,7 @@ module JamRuby
       else
         has_songs, has_artists = true, true
       end
-      result_sets = filter[KEY_RESULT_SETS] = self.class.json_schema[KEY_RESULT_SETS]
+      result_sets = filter[KEY_RESULT_SETS] = self.class.json_schema[KEY_RESULT_SETS].clone
       if has_songs
         rel = do_search(query)
         unless (val = query[KEY_SEARCH_STR]).blank?
@@ -123,10 +129,12 @@ module JamRuby
 
       if has_artists
         rel = do_search(query)
+        counter = rel.select("DISTINCT(jam_tracks.original_artist)")
         rel = rel.select("DISTINCT ON(jam_tracks.original_artist) jam_tracks.id, jam_tracks.original_artist")
 
         unless (val = query[KEY_SEARCH_STR]).blank?
           rel = rel.where("original_artist LIKE ?","%#{val}%")
+          counter = counter.and(rel)
         end
         rel = rel.order(:original_artist)
         
@@ -136,12 +144,14 @@ module JamRuby
         results = rel.all.collect do |jt|
           { 'id' => jt.id, 'artist' => jt.original_artist }
         end
+        
+        artist_count = counter.count
 
         result_sets[KEY_ARTISTS] = {
           KEY_RESULTS => results,
           KEY_PAGE_NUM => pgnum,
-          KEY_TOTAL_COUNT => rel.total_entries,
-          KEY_PAGE_COUNT => rel.total_pages,
+          KEY_TOTAL_COUNT => artist_count,
+          KEY_PAGE_COUNT => (artist_count / query[KEY_PER_PAGE].to_f).ceil,
         }
       end