def update
    @course = Course.find( @params[ :id ] )
    success = false
    if params[ :miscrequisite ][ :requisite ] == '' or
       params[ :miscrequisite ][ :requisite ].nil?
      if @course.miscrequisite
        if @course.update_attributes( params[ :course ] ) &&
           @course.miscrequisite.destroy
          success = true
        end
      else
        if @course.update_attributes( params[ :course ] )
          success = true
        end
      end
    else
      miscrequisite = MiscRequisite.find(
        :first,
        :conditions => [ '`course_id` = ?', params[ :id ] ]
      )
      if miscrequisite.nil?
        miscrequisite = MiscRequisite.new(
          params[ :id ],
          params[ :miscrequisite ][ :requisite ]
        )
        if @course.update_attributes( params[ :course ] ) &&
           miscrequisite.save
          success = true
        end
      else
        if @course.update_attributes( params[ :course ] ) &&
           miscrequisite.update_attribute( 'requisite', params[ :miscrequisite ][ :requisite ] )
          success = true
        end
      end
    end
  	if success
      flash[ 'notice' ] = 'The course was successfully updated.'
      redirect_to :action => 'list'
  	else
      @abbreviations = CourseCodeAbbreviation.find(
        :all,
        :order => '`abbreviation`'
      )
      @action = 'update'
      @css = 'form'
      @page_title = "Edit the general information of '" + @course.full_name + "'"
      @submit_button = 'Update record'
      render_action 'edit'
  	end
  end