stefan-kolb/nucleus

module Nucleus
  module API
    module FormProcessingHelper
      extend Grape::API::Helpers

      def update_fields(entity, entity_documentation, fields)
        # update all fields, but only with allowed values (according to the doc)
        unless fields.nil?
          fields.each do |key, value|
            # only continue if the value can be assigned to the entity
            next unless entity.respond_to? key
            allow_blank = entity_documentation[key.to_sym][:allow_blank]
            # allow_nil = entity_documentation[key][:required]

            unless value.is_a?(TrueClass) || value.is_a?(FalseClass)
              # currently no nil values allowed
              next if value.nil?
              # if value is blank, blank must be allowed
              next if value.empty? && !allow_blank
            end
            # finally update the value
            entity.send("#{key}=", value)
          end
        end
      end
    end
  end
end