snippet.rb

returning(String.new) do |html|
      @resource[:class].typus_defaults_for(:relationships).each do |relationship|

        association = @resource[:class].reflect_on_association(relationship.to_sym)

        next if @current_user.cannot?('read', association.class_name.constantize)

        macro = association.through_reflection ? :has_and_belongs_to_many : association.macro
        case macro
        when :has_and_belongs_to_many
          html << typus_form_has_and_belongs_to_many(relationship)
        when :has_many
          if association.options[:through]
            # Here we will shot the relationship. Better this than raising an error.
          else
            html << typus_form_has_many(relationship)
          end
        when :has_one
          html << typus_form_has_one(relationship)
        end

      end
    end