* VRFS-3188 - sort instrument appropriately

web/Gemfile

@@ -99,6 +99,7 @@ group :development, :test do
   gem 'factory_girl_rails', '4.1.0' # in dev because in use by rake task
   gem 'database_cleaner', '1.3.0' #in dev because in use by rake task
   gem 'teaspoon'
+  gem 'teaspoon-jasmine'
 end
 group :unix do
   gem 'therubyracer' #, '0.11.0beta8'

web/app/assets/javascripts/jam_track_screen.js.coffee

@@ -222,14 +222,31 @@ context.JK.JamTrackScreen=class JamTrackScreen
       @renderJamtracks(@currentData) 
     false
 
+  computeWeight: (jam_track_track, instrument) =>
+    weight = switch
+      when jam_track_track.track_type == 'Master' then 0
+      when jam_track_track.instrument?.id == instrument then 1 + jam_track_track.position
+      else 10000 + jam_track_track.position
+
   renderJamtracks:(data) =>
     @currentData = data
     that = this
+
     for jamtrack in data.jamtracks
       jamtrackExpanded = this.expanded==jamtrack.id
       trackRow = _.clone(jamtrack)
       trackRow.track_cnt = jamtrack.tracks.length
-      trackRow.tracks = []      
+      trackRow.tracks = []
+
+      # if an instrument is selected by the user, then re-order any jam tracks with a matching instrument to the top
+      instrument = @instrument.val()
+      if instrument?
+        jamtrack.tracks.sort((a, b) =>
+          aWeight = @computeWeight(a, instrument)
+          bWeight = @computeWeight(b, instrument)
+          return aWeight - bWeight
+        )
+
       for track in jamtrack.tracks
         trackRow.tracks.push(track)
         if track.track_type=='Master'

web/app/views/api_jam_tracks/show.rabl

@@ -15,7 +15,7 @@ node :purchased do |item|
 end
 
 child(:jam_track_tracks => :tracks) {
-  attributes :id, :part, :instrument, :track_type
+  attributes :id, :part, :instrument, :track_type, :position
 
   node do |track|
     {