Fix #3348 - don't display score button for levels without a score type

app/schemas/models/campaign.schema.coffee

@@ -118,6 +118,9 @@ _.extend CampaignSchema.properties, {
       campaign: c.shortString title: 'Campaign', description: 'Which campaign this level is part of (like "desert").', format: 'hidden'  # Automatically set by campaign editor.
       campaignIndex: c.int title: 'Campaign Index', description: 'The 0-based index of this level in its campaign.', format: 'hidden'  # Automatically set by campaign editor.
 
+      scoreTypes: c.array {title: 'Score Types', description: 'What metric to show leaderboards for.', uniqueItems: true},
+        c.shortString(title: 'Score Type', 'enum': ['time', 'damage-taken', 'damage-dealt', 'gold-collected', 'difficulty'])  # TODO: good version of LoC; total gear value.
+
       tasks: c.array {title: 'Tasks', description: 'Tasks to be completed for this level.'}, c.task
       concepts: c.array {title: 'Programming Concepts', description: 'Which programming concepts this level covers.'}, c.concept
 

app/styles/play/campaign-view.sass

@@ -280,7 +280,7 @@ $gameControlMargin: 30px
             opacity: 1
             padding: 3px 9px
 
-        &.complete
+        &.shows-leaderboard
           .start-level, .view-solutions
             min-width: calc(50% - 5px)
             display: inline-block

app/templates/play/campaign-view.jade

@@ -30,7 +30,9 @@ if campaign
           - var playCount = levelPlayCountMap[level.slug]
           .progress.progress-striped.active.hide
             .progress-bar(style="width: 100%")
-          div(class="level-info " + (levelStatusMap[level.slug] || "") + (level.requiresSubscription ? " premium" : ""))
+          - var showsLeaderboard = levelStatusMap[level.slug] === 'complete' && ((level.scoreTypes && level.scoreTypes.length) || ['hero-ladder', 'course-ladder'].indexOf(level.type) !== -1);
+
+          div(class="level-info " + (levelStatusMap[level.slug] || "") + (level.requiresSubscription ? " premium" : "") + (showsLeaderboard ? " shows-leaderboard" : ""))
             .level-status
             h3= i18n(level, 'name') + (level.disabled ? " (Coming soon!)" : (level.locked ? " (Locked)" : ""))
             - var description = i18n(level, 'description') || level.description || ""
@@ -53,7 +55,7 @@ if campaign
                   span(data-i18n="play.players") players
                   span.spr , #{Math.round(playCount.playtime / 3600)}
                   span(data-i18n="play.hours_played") hours played
-              if levelStatusMap[level.slug] === 'complete'
+              if showsLeaderboard
                 button.btn.btn-warning.btn.btn-lg.btn-illustrated.view-solutions(data-level-slug=level.slug)
                   span(data-i18n="leaderboard.scores")
               button.btn.btn-success.btn.btn-lg.btn-illustrated.start-level(data-i18n="common.play") Play