minor refactor to casting code to better match what the MysqlAdapter …

…does, removing unneeded checks

lib/active_record/connection_adapters/mysql2_adapter.rb

@@ -52,34 +52,32 @@ def klass
       def type_cast(value)
         return nil if value.nil?
         case type
-          when :string    then value
-          when :text      then value
-          when :integer   then value.is_a?(Fixnum) ? value : (value.to_i rescue value ? 1 : 0)
-          when :float     then value.class == Float ? value : value.to_f
-          when :decimal   then value.class == BigDecimal ? value : self.class.value_to_decimal(value)
-          when :datetime  then value.class == Time ? value : self.class.string_to_time(value)
-          when :timestamp then value.class == Time ? value : self.class.string_to_time(value)
-          when :time      then value.class == Time ? value : self.class.string_to_dummy_time(value)
-          when :date      then value.class == Date ? value : self.class.string_to_date(value)
-          when :binary    then value
-          when :boolean   then self.class.value_to_boolean(value)
+          when :string                then value
+          when :text                  then value
+          when :integer               then value.to_i rescue value ? 1 : 0
+          when :float                 then value.to_f # returns self if it's already a Float
+          when :decimal               then self.class.value_to_decimal(value)
+          when :datetime, :timestamp  then value.class == Time ? value : self.class.string_to_time(value)
+          when :time                  then value.class == Time ? value : self.class.string_to_dummy_time(value)
+          when :date                  then value.class == Date ? value : self.class.string_to_date(value)
+          when :binary                then value
+          when :boolean               then self.class.value_to_boolean(value)
           else value
         end
       end
 
       def type_cast_code(var_name)
         case type
-          when :string    then nil
-          when :text      then nil
-          when :integer   then "(#{var_name}.is_a?(Fixnum) ? #{var_name} : (#{var_name}.to_i rescue value ? 1 : 0))"
-          when :float     then "#{var_name}.class == Float ? #{var_name} : #{var_name}.to_f"
-          when :decimal   then "#{var_name}.class == BigDecimal ? #{var_name} : #{self.class.name}.value_to_decimal(#{var_name})"
-          when :datetime  then "#{var_name}.class == Time ? #{var_name} : #{self.class.name}.string_to_time(#{var_name})"
-          when :timestamp then "#{var_name}.class == Time ? #{var_name} : #{self.class.name}.string_to_time(#{var_name})"
-          when :time      then "#{var_name}.class == Time ? #{var_name} : #{self.class.name}.string_to_dummy_time(#{var_name})"
-          when :date      then "#{var_name}.class == Date ? #{var_name} : #{self.class.name}.string_to_date(#{var_name})"
-          when :binary    then nil
-          when :boolean   then "#{self.class.name}.value_to_boolean(#{var_name})"
+          when :string                then nil
+          when :text                  then nil
+          when :integer               then "#{var_name}.to_i rescue value ? 1 : 0)"
+          when :float                 then "#{var_name}.to_f"
+          when :decimal               then "#{self.class.name}.value_to_decimal(#{var_name})"
+          when :datetime, :timestamp  then "#{var_name}.class == Time ? #{var_name} : #{self.class.name}.string_to_time(#{var_name})"
+          when :time                  then "#{var_name}.class == Time ? #{var_name} : #{self.class.name}.string_to_dummy_time(#{var_name})"
+          when :date                  then "#{var_name}.class == Date ? #{var_name} : #{self.class.name}.string_to_date(#{var_name})"
+          when :binary                then nil
+          when :boolean               then "#{self.class.name}.value_to_boolean(#{var_name})"
           else nil
         end
       end