gem 'omg-attrs'

gem 'omg-attrs', path: '/path/to/this/folder'

require 'omg-attrs'

dad_hash = {
  age: 36,
  hair_color: 'brown',
  children: [
    { age: 4, hair_color: 'blonde' },
    { age: 8, hair_color: 'brown' }
  ],
  wife: { age: 37, hair_color: 'brown' }
}

dad_hash.attrs(:age) # => { age: 36 }

dad_hash.attrs(wife: :age, children: [:count, :age])
=> {
  wife: {
    age: 36
  },
  children: {
    count: 2,
    items: [
      { age: 8 },
      { age: 4 },
    ],
  },
}

dad_hash.attrs_match?(age: 36, hair_color: 'brown') # => true
dad_hash.children.find_by(age: 4) # => { age: 4, hair_color: 'brown' }
dad_hash.children.where(hair_color: 'brown') # => [{ age: 4, hair_color: 'brown' }]