lib/unit_measurements/measurement.rb in unit_measurements-5.10.0 vs lib/unit_measurements/measurement.rb in unit_measurements-5.11.0

@@ -241,11 +241,11 @@
 
       # Methods delegated from the unit group.
       def_delegators :unit_group, :primitive, :units, :cache_file, :unit_names,
                      :unit_with_name_and_aliases, :unit_names_with_aliases,
                      :unit_for, :unit_for!, :defined?, :unit_or_alias?, :[],
-                     :units_for, :units_for!
+                     :units_for, :units_for!, :systems
 
       # Parses an input string and returns a +Measurement+ instance depending on
       # the input string. This method first normalizes the +input+ internally,
       # using the +Normalizer+ before parsing it using the +Parser+.
       #
@@ -364,9 +364,43 @@
       #
       # @author {Harshal V. Ladhe}[https://shivam091.github.io/]
       # @since 5.2.0
       def clear_cache
         cached.clear_cache
+      end
+
+      # Calculates the ratio between two units.
+      #
+      # This method takes a source unit and a target unit, and returns the ratio
+      # between them as a string representation.
+      #
+      # @example Calculating the ratio between 'in' and 'ft':
+      #   UnitMeasurements::Length.ratio("in", "ft")
+      #   => "12.0 in/ft"
+      #
+      #   UnitMeasurements::Length.ratio(UnitMeasurements::Length.unit_for("in"), "ft")
+      #   => "12.0 in/ft"
+      #
+      # @param [Unit|String|Symbol] source_unit
+      #   The source unit for the ratio calculation.
+      # @param [Unit|String|Symbol] target_unit
+      #   The target unit for the ratio calculation.
+      #
+      # @return [String] The ratio between the source and target units.
+      #
+      # @raise [UnitError]
+      #   If either the source unit or the target unit is not found in the unit group.
+      #
+      # @author {Harshal V. Ladhe}[https://shivam091.github.io/]
+      # @since 5.11.0
+      def ratio(source_unit, target_unit)
+        source_unit = source_unit.is_a?(Unit) ? source_unit : unit_for!(source_unit)
+        target_unit = target_unit.is_a?(Unit) ? target_unit : unit_for!(target_unit)
+
+        source_quantity = 1
+        target_quantity = new(source_quantity, target_unit).convert_to(source_unit).quantity
+
+        "#{target_quantity} #{source_unit}/#{target_unit}"
       end
 
       private
 
       # @private