DryValidationParser

Generate a readable hash by parsing the abstract syntax tree of a Dry::Validation::Contract schema

The gem is still work in progress and is not yet fully tested.

Add this line to your application's Gemfile:

gem 'dry_validation_parser'

And then execute:

bundle install

Lets say we have the following Dry::Validation::Contract definition:

class TestContract < Dry::Validation::Contract
    params do
        required(:some_field).value(:str?, min_size?: 5, max_size?: 10)
        required(:some_array_of_objects).array(:hash) do
            required(:some_nested_attribute).value(:str?)
        end
        required(:some_array_of_integers).array(:int?)
        required(:dto).value(:hash) do
            optional(:some_nested_attribute).maybe(:str?)
        end
    end
end

parser = DryValidationParser::ValidationSchemaParser.new

parser.call(TestContract) will set the keys of the parser object to:

{
    :some_field => {
        :required => true,
        :type => "string",
        :description => "Minimum size: 5, Maximum size: 10"
    },
     :some_array_of_objects => { 
        :required => true,
        :array => true,
        :type => "array",
        :keys => {
            :some_nested_attribute => {
                :required=>true, :type=>"string"
            }
        }
     },
     :some_array_of_integers => {
        :required=>true, 
        :array=>true, 
        :type=>"integer"
     },
     :dto => {
        :required => true,
        :type => "hash",
        :keys => {
            :some_nested_attribute => {
                :required => false, 
                :nullable =>true, 
                :type=>"string"
            }
        }
     }
}

As we can see, the DryValidationParser::ValidationSchemaParser goes through all the params defined in the schema and generates a hash. The hash is saved in the keys attribute of the parser.

The required key in our result will be set to true if the field is defined as required(:field_name), and false if defined as optional(:field_name).

For nested objects like array of objects or hash, we add a keys field with a definition for each field inside the nested hash.

If the field is an array of primitive type, the type field will equal to the primitive type, and a array flag will be set on the field.

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/Jane-Terziev/dry_validation_parser. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

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

Everyone interacting in the Dry::Validation::Parser project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.