FinerStruct

A nicer replacement for Ruby's Struct and OpenStruct.

Isn't it annoying how OpenStruct.new takes a hash, but the arguments to Struct.new have to be ordered?

Do you find you always use an OpenStruct when you don't really care if it's open, you just want an easy way to create an object from a hash?

Did you know that creating an OpenStruct blows away Ruby's method cache?

Isn't it irritating how you have to remember that, to use OpenStruct, you need to require 'ostruct'?

Have you ever wished you could create a Struct or OpenStruct, but make it immutable?

Installation

Add this line to your application's Gemfile:

gem 'finer_struct'

And then execute:

$ bundle

Or install it yourself as:

$ gem install finer_struct

Immutable structs can't have their attributes changed after creation.

struct = FinerStruct::Immutable.new(a: 1, b: 2)

struct.a # => 1
struct.b # => 2
struct.a = 3 # Exception!

class MyStruct < FinerStruct::Immutable(:a, :b); end
struct = MyStruct.new(a: 1, b: 2)

MyStruct.new(a: 1, b: 2, c: 3) # Exception!

Mutable structs let you assign attributes at any time.

struct = FinerStruct::Mutable.new(a: 1, b: 2)

struct.a = 3
struct.a # => 3

class MyStruct < FinerStruct::Mutable(:a, :b); end
struct = MyStruct.new(a: 1, b: 2)