money.rb in exchange-1.0.0

- old
+ new

@@ -1,5 +1,6 @@
+# -*- encoding : utf-8 -*-
 # Top Level Module of the the gem.
 # @author Beat Richartz
 # @version 0.9
 # @since 0.1
 
@@ -86,13 +87,21 @@
       other = ISO.assert_currency!(other)
       
       if api_supports_currency?(other)
         opts = { :at => time, :from => self }.merge(options)
         Money.new(api.new.convert(value, currency, other, opts), other, opts)
+      elsif fallback!
+        to other, options
       else
         raise_no_rate_error(other)
       end
+    rescue ExternalAPI::APIError
+      if fallback!
+        to other, options
+      else
+        raise
+      end
     end
     alias :in :to
     
     class << self
       
@@ -101,11 +110,12 @@
         # @private
         # @!macro [attach] install_operation
         #
         def install_operation op
           define_method op do |*precision|
-            Exchange::Money.new(ISO.send(op, self.value, self.currency, precision.first), currency, :at => time, :from => self)
+            psych = precision.first == :psych
+            Exchange::Money.new(ISO.send(op, self.value, self.currency, psych ? nil : precision.first, {:psych => psych}), currency, :at => time, :from => self)
           end
         end
       
         # @private
         # @!macro [attach] base_operation
@@ -294,22 +304,38 @@
     #   Exchange::Money.new(49.567, :usd).to_s #=> "USD 49.57"
     # @example Convert a currency without minor to a string
     #   Exchange::Money.new(45, :jpy).to_s #=> "JPY 45"
     # @example Convert a currency with a three decimal minor to a string
     #   Exchange::Money.new(34.34, :omr).to_s #=> "OMR 34.340"
-    # @example Convert a currency to a string without the currency
-    #   Exchange::ISO.stringif(34.34, :omr).to_s(:iso) #=> "34.340"
+    # @example Convert a currency with a three decimal minor to a string with a currency symbol
+    #   Exchange::Money.new(34.34, :usd).to_s(:symbol) #=> "$34.34"
+    # @example Convert a currency with a three decimal minor to a string with just the amount
+    #   Exchange::Money.new(34.34, :omr).to_s(:amount) #=> "34.340"
     #
     def to_s format=:currency
-      [
-        format == :currency && ISO.stringify(value, currency),
-        format == :amount && ISO.stringify(value, currency, :amount_only => true)
-      ].detect{|l| l.is_a?(String) }
+      ISO.stringify(value, currency, :format => format)
     end
     
     private
     
+      # Fallback to the next api defined in the api fallbacks. Changes the api for the given instance
+      # @return [Boolean] true if the fallback was successful, false if not
+      # @since 1.0
+      # @version 1.0
+      #
+      def fallback!
+        fallback = Exchange.configuration.api.fallback
+        new_api  = fallback.index(api) ? fallback[fallback.index(api) + 1] : fallback.first
+        
+        if new_api
+          @api = new_api
+          return true
+        end
+        
+        return false
+      end
+    
       # determine if another given object is an instance of Exchange::Money
       # @param [Object] other The object to be tested against
       # @return [Boolean] true if the other is an instance of Exchange::Money, false if not
       # @since 0.6
       # @version 0.6
@@ -361,15 +387,15 @@
       # @raise [NoRateError] an error indicating that the given string is a currency, but no rate is present
       # @since 0.7.2
       # @version 0.7.2
       #
       def raise_no_rate_error other
-        raise NoRateError.new("Cannot convert to #{other} because the defined api does not provide a rate")
+        raise NoRateError.new("Cannot convert to #{other} because the defined api nor the fallbacks provide a rate")
       end
   
   end
   
   # The error that will get thrown when implicit conversions take place and are not allowed
   #
   ImplicitConversionError = Class.new(StandardError)
   
-end
\ No newline at end of file
+end