gistfile1.txt

module Model
	BaseModel = Class.new(Sequel::Model)
	class BaseModel
		class << self
			def initialize_subclass(visible_fields,callable_setters)
				@user_visible_fields = visible_fields
				@user_callable_setters = []
			end

			def inherited(sc)
				super
				sc.send(:initialize_subclass,@user_visible_fields || [],@user_callable_setters || [])
			end

			def add_user_visible_fields *args
				@user_visible_fields += args
			end

			def add_user_callable_setters *args
				@user_callable_setters += args
			end

			def user_safe_create params
				model = new
				model.set_user_writeable_fields(params)
				model.save
			end

		end
		private_class_method :initialize_subclass

		def user_visible_fields
			self.class.instance_variable_get(:@user_visible_fields)
		end

		def user_callable_setters
			self.class.instance_variable_get(:@user_callable_setters)
		end

		def public_fields
			keys.select { |k| user_visible_fields.include? k }.map { |k| [k,send(k)] }.to_h
		end

		def set_user_writeable_fields hash={}
			hash.each do |k,v|
				if user_callable_setters.include?(k)
					meth = "#{k}=".to_sym
					if self.respond_to?(meth)
						self.send(meth,v)
					end
				else
					puts "user tries to write user_protected field #{k} of #{self.inspect}"
				end
			end
		end
	end

end