Add nil guard and zero default to downloads by season

Author: radical-ube

app/models/concerns/podcast_metrics.rb

@@ -66,18 +66,33 @@ def season_download_rollups
     end.sort { |a, b| b[1] <=> a[1] }
   end
 
+  def season_label(season_number)
+    I18n.t(".helpers.label.metrics.downloads_by_season", season_number: season_number)
+  end
+
   def downloads_by_season(season_number:)
+    return nil unless published_seasons.include?(season_number)
+    default = {"#{season_label(season_number)}": 0}
+
     season_episodes_guids = episodes.published.where(season_number: season_number).pluck(:guid)
+    return default if season_episodes_guids.blank?
+
     expiration = (season_number == latest_season) ? 1.hour : 1.month
 
-    metrics_cache_fetch("#{metrics_cache_key}/downloads_by_season/#{season_number}", expires_in: expiration) do
+    results = metrics_cache_fetch("#{metrics_cache_key}/downloads_by_season/#{season_number}", expires_in: expiration) do
       Rollups::HourlyDownload
         .where(podcast_id: id)
         .where(episode_id: season_episodes_guids)
         .group(:podcast_id)
         .final
         .sum(:count)
-    end.transform_keys { |k| "Season #{season_number}" }
+    end
+
+    if results.blank?
+      default
+    else
+      results.transform_keys { |k| season_label(season_number) }
+    end
   end
 
   def top_countries_downloads

config/locales/en.yml

@@ -462,44 +462,7 @@ en:
         caption: Caption
         credit: Credit
       metrics:
-        chart:
-          all_episodes: All Episodes
-        interval:
-          hour: Hourly
-          day: Daily
-          week: Weekly
-          month: Monthly
-        date_presets:
-          7_days_last: Last 7 Days
-          14_days_last: Last 14 Days
-          28_days_last: Last 28 Days
-          1_month_previous: Previous Month
-          3_months_previous: Previous 3 Months
-          6_months_previous: Previous 6 Months
-          1_year_previous: Previous Year
-          date_week: Week to Date
-          date_month: Month to Date
-          date_year: Year to Date
-          7_days_drop: 7 days since drop
-          14_days_drop: 14 days since drop
-          28_days_drop: 28 days since drop
-          1_month_drop: 1 month since drop
-          3_months_drop: 3 months since drop
-          all_time: All-time
-        dropdays:
-          "7": 7 Days
-          "14": 14 Days
-          "28": 28 Days
-          "30": 30 Days
-          "60": 60 Days
-          "90": 90 Days
-          "24": 24 Hours
-          "48": 48 Hours
-        uniques:
-          last_7_rolling: Daily (7-Day Window)
-          last_28_rolling: Daily (28-Day Window)
-          calendar_week: Weekly
-          calendar_month: Monthly
+        downloads_by_season: "Season %{season_number}"
       person:
         href: Link
         name: Name