[Fix #1309] Task to clean datetime champs in db

lib/tasks/2018_01_18_clean_datetime_in_champs.rake

@@ -0,0 +1,30 @@
+namespace :'2018_01_18_clean_datetime_in_champs' do
+  task clean: :environment do
+    datetime_champs = TypeDeChamp.where(type_champ: "datetime").flat_map{ |t| t.champ }
+
+    # Match " HH:MM" => nil a datetime is not valid if not composed by date AND time
+    datetime_champs.select { |c| /^\s\d{2}:\d{2}$/.match(c.value) }.each do |c|
+      puts "cleaning #{c.value} => nil"
+      c.update_columns(value: nil)
+    end
+
+    # Match "dd/mm/YYYY HH:MM" => "YYYY-mm-dd HH:MM"
+    datetime_champs.select { |c| /^\d{2}\/\d{2}\/\d{4}\s\d{2}:\d{2}$/ =~ c.value }.each do |c|
+      formated_date = DateTime.parse(c.value, "%d/%m/%Y %H:%M").strftime("%Y-%m-%d %H:%M")
+      puts "cleaning #{c.value} => #{formated_date}"
+      c.update_columns(value: formated_date)
+    end
+
+    # Match "ddmmYYYY HH:MM" => "YYYY-mm-dd HH:MM"
+    datetime_champs.select { |c| /^\d{8}\s\d{2}:\d{2}$/ =~ c.value }.each do |c|
+      day = c.value[0,2]
+      month = c.value[2,2]
+      year = c.value[4,4]
+      hours = c.value[9,2]
+      minutes = c.value[12,2]
+      formated_date = "#{year}-#{month}-#{day} #{hours}:#{minutes}"
+      puts "cleaning #{c.value} => #{formated_date}"
+      c.update_columns(value: formated_date)
+    end
+  end
+end