FastOpenStruct

It was inspirated on DynamicClass gem.

The main purpose of this gem is behave like an OpenStruct, but with some extra powers.

The main difference for OpenStruct is that this implementation has a cache of the methods that are created, so it is faster.

Diferences from OpenStruct

It is faster
It has a cache of the methods that are created
It does not uses @table instance variable
It has a dig method that works like Hash#dig to access nested attributes
It implements some methods of ActiveModel::API and ActiveModel::Serialization, making it useful for some cases (i.e. using it as :class for FactoryBot factories)
It makes a deep initialization of the attributes, converting Hash to FastOpenStruct

Installation

Add this line to your application's Gemfile:

gem 'fast_open_struct'

And then execute:

$ bundle

Or install it yourself as:

$ gem install fast_open_struct

Usage

require 'fast_open_struct'

attributes = { name: 'John' }

my_struct = FastOpenStruct.new(attributes)

# Set attributes 
my_struct.nickname = 'Big John'
my_struct['lastname'] = 'Connor'
my_struct[:age] = 30

# Access attributes
my_struct.name # => 'John'
my_struct[:nickname] # => 'Big John'
my_struct['lastname'] # => 'Connor'
my_struct.dig(:age) # => 30

Benchmarks

Initialization benchmark

Warming up --------------------------------------
          OpenStruct    15.041k i/100ms
      FastOpenStruct   116.264k i/100ms
Calculating -------------------------------------
          OpenStruct    152.606k (± 2.4%) i/s -    767.091k in   5.029398s
      FastOpenStruct      1.148M (± 1.4%) i/s -      5.813M in   5.063585s

Comparison:
      FastOpenStruct:  1148278.4 i/s
          OpenStruct:   152606.3 i/s - 7.52x  slower



Assignment Benchmark

Warming up --------------------------------------
          OpenStruct   682.010k i/100ms
      FastOpenStruct     1.972M i/100ms
Calculating -------------------------------------
          OpenStruct      6.980M (± 3.3%) i/s -     35.465M in   5.086554s
      FastOpenStruct     19.964M (± 0.8%) i/s -    100.582M in   5.038516s

Comparison:
      FastOpenStruct: 19964034.5 i/s
          OpenStruct:  6980499.3 i/s - 2.86x  slower



Access Benchmark

Warming up --------------------------------------
          OpenStruct     1.005M i/100ms
      FastOpenStruct     2.185M i/100ms
Calculating -------------------------------------
          OpenStruct     10.085M (± 0.5%) i/s -     51.245M in   5.081712s
      FastOpenStruct     21.798M (± 1.1%) i/s -    109.268M in   5.013290s

Comparison:
      FastOpenStruct: 21798290.7 i/s
          OpenStruct: 10084528.1 i/s - 2.16x  slower



All-Together Benchmark

Warming up --------------------------------------
          OpenStruct    12.918k i/100ms
      FastOpenStruct   111.460k i/100ms
Calculating -------------------------------------
          OpenStruct    127.875k (± 2.7%) i/s -    645.900k in   5.054749s
      FastOpenStruct      1.122M (± 1.1%) i/s -      5.684M in   5.066350s

Comparison:
      FastOpenStruct:  1122147.0 i/s
          OpenStruct:   127874.6 i/s - 8.78x  slower

Contributing

Bug reports and pull requests are welcome on GitHub

License

The gem is available as open source under the terms of the MIT License.