VRFS-1890 : Mechanism to move track up/down, hook up in admin UI.

admin/app/admin/jam_tracks.rb

@@ -11,6 +11,18 @@ ActiveAdmin.register  JamRuby::JamTrack, :as => 'JamTracks' do
   form :partial => 'form'
 
   index do
+
+    # default_actions # use this for all view/edit/delete links    
+    column "Actions" do |jam_track|
+      links = ''.html_safe
+      clz = "member_link view_link show_tracks"
+      clz += ' expand' if params[:focus_track]==jam_track.id
+      links << link_to("Show Tracks", '#', :class => clz)
+      links << link_to("Update", edit_resource_path(jam_track), :class => "member_link edit_link")
+      links
+    end
+
+
     column :id
     column :name
     column :description
@@ -40,18 +52,35 @@ ActiveAdmin.register  JamRuby::JamTrack, :as => 'JamTracks' do
         column :track_type
         column :instrument
         column :part
-        column :track do |track|
+
+        column "" do |track|
+          if track.position > 1
+            link_to 'Move Up', "jam_tracks/#{track.id}/move_up"
+          end
+        end
+        column "" do |track|
+          if track.position < jam_track.jam_track_tracks.count
+            link_to 'Move Down', "jam_tracks/#{track.id}/move_down"
+          end
+        end
+        column "" do |track|
           link_to 'Play', '#'
         end
       end
     end
 
-    # default_actions # use this for all view/edit/delete links
-    column "Actions" do |jam_track|
-      links = ''.html_safe
-      links << link_to("Show Tracks", '#', :class => "member_link view_link show_tracks")
-      links << link_to("Update", edit_resource_path(jam_track), :class => "member_link edit_link")
-      links
-    end
+    
+  end
+
+  member_action :move_up, :method => :get do
+    track = JamTrackTrack.where("id=?",params[:id]).first
+    track.move_up
+    redirect_to("/admin/jam_tracks?focus_track=#{track.jam_track_id}", {:notice => "Moved Up."})
+  end
+
+  member_action :move_down, :method => :get do
+    track = JamTrackTrack.where("id=?",params[:id]).first
+    track.move_down
+    redirect_to("/admin/jam_tracks?focus_track=#{track.jam_track_id}", {:notice => "Moved Down."})    
   end
 end

admin/app/assets/javascripts/jam_track.js

@@ -1,43 +1,48 @@
+function showTracks(rowJamTrack) {
+  var $jamTrackTracks = rowJamTrack.find("td.jam_track_tracks");
+
+  var name=rowJamTrack.find("td.name").text()
+  var count = $jamTrackTracks.find("table tbody tr").length;
+
+  if (rowJamTrack.next().attr('id') == "jam_track_tracks_detail") {
+    $(this).html("Show Tracks");
+    rowJamTrack.next().remove();
+  } else {
+    $(this).html('Hide Tracks');
+    if (count == 0) {
+      rowJamTrack.after(
+        $("<tr id=\"jam_track_tracks_detail\"></tr>").html(
+          $("<td colspan=\"1\"></td>")
+        ).append(
+          $("<td colspan=\"4\"></td>").html(
+            "No Tracks"
+          )
+        )
+      );
+    }
+    else {
+      rowJamTrack.after(
+        $("<tr id=\"jam_track_tracks_detail\"></tr>").html(
+          $("<td/><td colspan=\"1\"><em><strong>Tracks in '" + name + "':</strong></em></td>")
+        ).append(
+          $("<td colspan=\"4\"></td>").html(
+            $jamTrackTracks.html()
+          )
+        )
+      );
+    }
+  }
+}
+
 $(document).ready(function() {
   $("th.jam_track_tracks").css('display', 'none');
   $("td.jam_track_tracks").css('display', 'none');
-
+  showTracks($("a.expand").parents("tr"))
+   
   $(".show_tracks").click(function(e) {
     e.preventDefault();
 
     var $rowJamTrack = $(this).parents('tr');
-    var $jamTrackTracks = $($rowJamTrack).find("td.jam_track_tracks");
-
-    var count = $jamTrackTracks.find("table tbody tr").length;
-
-    if ($rowJamTrack.next().attr('id') == "jam_track_tracks_detail") {
-      $(this).html("Show Tracks");
-      $rowJamTrack.next().remove();
-    }
-    else {
-      $(this).html('Hide Tracks');
-      if (count == 0) {
-        $rowJamTrack.after(
-          $("<tr id=\"jam_track_tracks_detail\"></tr>").html(
-            $("<td colspan=\"18\"></td>")
-          ).append(
-            $("<td colspan=\"4\"></td>").html(
-              "No Tracks"
-            )
-          )
-        );
-      }
-      else {
-        $rowJamTrack.after(
-          $("<tr id=\"jam_track_tracks_detail\"></tr>").html(
-            $("<td colspan=\"18\"></td>")
-          ).append(
-            $("<td colspan=\"4\"></td>").html(
-              $jamTrackTracks.html()
-            )
-          )
-        );
-      }
-    }
+    showTracks($rowJamTrack) 
   })
 });

ruby/lib/jam_ruby/models/jam_track_track.rb

@@ -43,5 +43,52 @@ module JamRuby
       # I think we have to make a special case for 'previews', but maybe that's just up to the controller to not check can_download?
       jam_track.owners.include?(user)
     end
-  end
-end
+
+    def move_up
+      #normalize_position
+      if self.position > 1
+        # Switch with previous
+        previous_track = self.jam_track.jam_track_tracks.where("position=?", self.position-1).first
+        if previous_track
+          JamTrack.transaction do
+            previous_track.position,self.position = self.position,previous_track.position
+            previous_track.save(validate:false)
+            self.save(validate:false)
+          end
+        end
+      end
+    end
+
+    def move_down
+      count=normalize_position
+      if self.position < count
+        # Switch with next:
+        next_track = self.jam_track.jam_track_tracks.where("position=?", self.position+1).first
+        if next_track
+          next_track.position,self.position = self.position,next_track.position
+          next_track.save(validate:false)
+          self.save(validate:false)
+        end
+      end
+    end
+
+  private
+    def normalize_position
+      parent = self.jam_track
+      position = 0        
+      if parent
+        JamTrack.transaction do
+          parent.jam_track_tracks.each do |jtt|
+            position += 1
+            if jtt.position != position
+              jtt.position = position
+              jtt.save(validate:false)                      
+            end
+          end
+        end
+      end
+      position
+    end # normalize_position
+
+  end # class
+end # module