bombazook/vexile

Params parser with object generation and ActiveModel validations

Vexile

Simple dsl for multilevel hash validations

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Tested on:

• 2.0.0
• 1.9.3
• 1.9.2
• 1.8.7
• ree
• jruby-head
• jruby-18mode
• jruby-19mode
• rbx-18mode
• rbx-19mode

Installation

Add this line to your application's Gemfile:

gem 'vexile'

And then execute:

$ bundle

Or install it yourself as:

$ gem install vexile

Usage

Just declare some classes using such DSL:

class A
  include Vexile::DSL
end

class B
  include Vexile::DSL
end

class C
  include Vexile::DSL
end

and then, if you have deep level hashes something like {"a": {"b":{"param1":"value1"}, "cs": [{"param2":2}, {"param2": 3}]}}} and if you know it's structure, you can modify classes somehow like that:

class A
  include Vexile::DSL
  has_one :b
  has_many :cs
end

class B
  include Vexile::DSL
  attr_accessor :param1
end

class C
  include Vexile::DSL
  attr_accessor :param2
end

then create instance of top level class and load hash to it:

a = A.new
a.load_params({"b"=>{"param1"=>"value1"}, "cs"=> [{"param2"=>"atata"}, {"param2"=> 3}]})

Now you have an instances tree initialized:

a.b # => <B ... @param1="value1" ... >
a.cs # => [#<C ... @param2=2 ...>, #<C ... @param2=3 ...>] 

So you can also add activemodel validations:

class A
  include Vexile::DSL
  has_one :b
  has_many :cs
  validates :cs, :recursive => true # validator that checks any loaded C instance
end

class B
  include Vexile::DSL
  attr_accessor :param1
  validates :param1, :numericality => true
end

class C
  include Vexile::DSL
  attr_accessor :param2
  validates :param2, :numericality => true
end

So

a.valid? # => false # 

because of NumericalityValidator added

a.errors # => ...  @messages={:cs=>["is invalid in #<C:0x007f94729ade28> : {:param2=>[\"is not a number\"]}"...

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Added some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request