(bug) unable to update a training's title

CHANGELOG.md

@@ -6,6 +6,7 @@
 - Improved public calendar loading time
 - Fix a bug: event image updates are not reflected unless the browser's cache is purged
 - Fix a bug: schedules jobs are not launched at the right time
+- Fix a bug: unable to update the title of a training
 - [TODO DEPLOY] `rails fablab:fix_availabilities` THEN `rails fablab:setup:build_places_cache`
 - [TODO DEPLOY] `\curl -sSL https://raw.githubusercontent.com/sleede/fab-manager/master/scripts/rename-supporting-document.sh | bash`
 

app/models/plan.rb

@@ -98,11 +98,11 @@ class Plan < ApplicationRecord
 
   # must be publicly accessible for the migration
   def create_statistic_type
-    stat_index = StatisticIndex.where(es_type_key: 'subscription')
+    stat_index = StatisticIndex.find_by(es_type_key: 'subscription')
     type = find_statistic_type
     if type.nil?
       type = StatisticType.create!(
-        statistic_index_id: stat_index.first.id,
+        statistic_index_id: stat_index.id,
         key: duration.to_i,
         label: "#{I18n.t('statistics.duration')} : #{human_readable_duration}",
         graph: true,
@@ -114,11 +114,11 @@ class Plan < ApplicationRecord
   end
 
   def find_statistic_type
-    stat_index = StatisticIndex.where(es_type_key: 'subscription')
-    type = StatisticType.find_by(statistic_index_id: stat_index.first.id, key: duration.to_i)
+    stat_index = StatisticIndex.find_by(es_type_key: 'subscription')
+    type = StatisticType.find_by(statistic_index_id: stat_index.id, key: duration.to_i)
     return type if type
 
-    StatisticType.where(statistic_index_id: stat_index.first.id).where('label LIKE ?', "%#{human_readable_duration}%").first
+    StatisticType.where(statistic_index_id: stat_index.id).where('label LIKE ?', "%#{human_readable_duration}%").first
   end
 
   private

app/models/training.rb

@@ -52,9 +52,9 @@ class Training < ApplicationRecord
   end
 
   def update_statistic_subtype
-    index = StatisticIndex.where(es_type_key: 'training')
+    index = StatisticIndex.find_by(es_type_key: 'training')
     subtype = StatisticSubType.joins(statistic_type_sub_types: :statistic_type)
-                              .find_by(key: slug, statistic_types: { statistic_index_id: index.id })
+                              .find_by!(key: slug, statistic_types: { statistic_index_id: index.id })
     subtype.update(label: name)
   end