Added to_string methods to typecasting subclasses

* Updated methods to use to_string instead of calling value.to_s inline

lib/virtus/typecast/big_decimal.rb

@@ -5,6 +5,20 @@ module Typecast
     #
     class BigDecimal < Object
 
+      # Typecast given value to String
+      #
+      # @example
+      #   Virtus::Typecast::BigDecimal.to_string(BigDecimal('1.0')) # => "1.0"
+      #
+      # @param [BigDecimal] value
+      #
+      # @return [String]
+      #
+      # @api public
+      def self.to_string(value)
+        value.to_s('F')
+      end
+
       # Creates a Fixnum instance from a BigDecimal
       #
       # @example

lib/virtus/typecast/date.rb

@@ -5,12 +5,26 @@ module Typecast
     #
     class Date < Object
 
+      # Typecast given value to String
+      #
+      # @example
+      #   Virtus::Typecast::Date.to_string(date) # => "2011-07-20"
+      #
+      # @param [Date] value
+      #
+      # @return [String]
+      #
+      # @api public
+      def self.to_string(value)
+        value.to_s
+      end
+
       # @api public
       def self.to_datetime(value)
         if value.respond_to?(:to_datetime)
           value.to_datetime
         else
-          String.to_datetime(value.to_s)
+          String.to_datetime(to_string(value))
         end
       end
 

lib/virtus/typecast/date_time.rb

@@ -5,12 +5,26 @@ module Typecast
     #
     class DateTime < Object
 
+      # Typecast given value to String
+      #
+      # @example
+      #   Virtus::Typecast::DateTime.to_string(date_time) # => "2011-07-20T10:30:41-07:00"
+      #
+      # @param [DateTime] value
+      #
+      # @return [String]
+      #
+      # @api public
+      def self.to_string(value)
+        value.to_s
+      end
+
       # @api public
       def self.to_date(value)
         if value.respond_to?(:to_date)
           value.to_date
         else
-          String.to_date(value.to_s)
+          String.to_date(to_string(value))
         end
       end
 
@@ -19,7 +33,7 @@ def self.to_time(value)
         if value.respond_to?(:to_time)
           value.to_time
         else
-          String.to_time(value.to_s)
+          String.to_time(to_string(value))
         end
       end
 

lib/virtus/typecast/float.rb

@@ -5,14 +5,28 @@ module Typecast
     #
     class Float < Object
 
+      # Typecast given value to String
+      #
+      # @example
+      #   Virtus::Typecast::Fixnum.to_string(0.10) # => "0.10"
+      #
+      # @param [Fixnum] value
+      #
+      # @return [String]
+      #
+      # @api public
+      def self.to_string(value)
+        value.to_s
+      end
+
       # @api public
       def self.to_i(value)
         value.to_i
       end
 
       # @api public
       def self.to_d(value)
-        value.to_s.to_d
+        to_string(value).to_d
       end
 
     end # class Float

lib/virtus/typecast/time.rb

@@ -5,12 +5,26 @@ module Typecast
     #
     class Time < Object
 
+      # Typecast given value to String
+      #
+      # @example
+      #   Virtus::Typecast::Time.to_string(time) # => "Wed Jul 20 10:30:41 -0700 2011"
+      #
+      # @param [Time] value
+      #
+      # @return [String]
+      #
+      # @api public
+      def self.to_string(value)
+        value.to_s
+      end
+
       # @api public
       def self.to_datetime(value)
         if value.respond_to?(:to_datetime)
           value.to_datetime
         else
-          String.to_datetime(value.to_s)
+          String.to_datetime(to_string(value))
         end
       end
 
@@ -19,7 +33,7 @@ def self.to_date(value)
         if value.respond_to?(:to_date)
           value.to_date
         else
-          String.to_date(value.to_s)
+          String.to_date(to_string(value))
         end
       end