prevent eql_readings to be saved to db.

app/helpers/InSyncState.rb

@@ -77,8 +77,13 @@ class InSyncState < StatePattern::State
              next_is_gas = true # the usage is on the next line
            end                
          }
-                                
-        reading.save
+        
+        last_reading = Reading.last
+        if last_reading.eql_reading?(reading)
+          p "Nothing changed. Do not add to the database"
+        else                        
+          reading.save
+        end
         return reading
 
      end

app/models/reading.rb

@@ -1,3 +1,14 @@
 class Reading < ActiveRecord::Base
+  
+  def eql_reading?(reading)
+    self.total_kwh_consumed_high == reading.total_kwh_consumed_high &&
+    self.total_kwh_consumed_low == reading.total_kwh_consumed_low &&
+    self.total_kwh_produced_high == reading.total_kwh_produced_high &&
+    self.total_kwh_produced_low == reading.total_kwh_produced_low &&
+    self.current_kw_consumed == reading.current_kw_consumed &&
+    self.current_kw_produced = reading.current_kw_produced &&
+    self.total_m3_gas_consumed = reading.total_m3_gas_consumed &&
+    self.high_tarif == reading.high_tarif
+  end
 
 end