Sinatra::Validation

Sinatra extension for request parameter validation powered with dry-validation

Add this line to your application's Gemfile:

gem 'sinatra-validation'

Or install it yourself as:

$ gem install sinatra-validation

Register Sinatra::Validation to your Sinatra application.

class Application < Sinatra::Base
  configure do
    register Sinatra::Validation
  end
end

Now you can use validates helper in your routes. The validation logic itself is implemented by dry-validation internally, so follow the validation syntax provided by the gem.

  get '/basic' do
    validates do
      params do
        required("name").filled(:str?)
        required("age").filled(:str?)
      end
    end

    ...
  end

The helper halts with 400 if params does not meet the given validation rule.

You can suppress the default behavior which validates helper halts with 400 when the validation fails by setting silent option to true. With the option, validates helper returns the instance of Validation::Result.

  get '/silent' do
    result = validates silent: true do
      params do
        required("name").filled(:str?)
        required("age").filled(:str?)
      end
    end

    p result # <struct Sinatra::Validation::Result params={"name"=>"justine"}, messages=["age is missing"]>

    ...
  end

You can do enable :silent_validation in your Sinatra application instead if you want to enable this option to all validations.

By default, validates helper halts with 400, but if you set the option raise to true, you can make validates helper raise the exception instead.

  get '/raise' do
    begin
      validates raise: true do
        params do
          required("name").filled(:str?)
        end
      end
    rescue => e
      p e.result # <Sinatra::Validation::InvalidParameterError: {:params=>{}, :messages=>["name is missing"]}>
    end

    ...
  end

if you want to enable this option to all validations, you can do enable :raise_sinatra_validation_exception in your Sinatra application instead. Then, you can catch the exception in error block or something.

  enable :raise_sinatra_validation_exception

  error Sinatra::Validation::InvalidParameterError do
    # do anything you want
  end

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.

$ bundle install
$ rake

$ cd example
$ bundle exec rackup

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

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