ValidateParams

Params validations for Ruby on Rails.

Installation

Add this line to your application's Gemfile:

gem 'validate_params'

And then execute:

$ bundle

Usage

In your controller:

class ExamplesController < ApplicationController
  include ValidateParams

  def create
    validate_params! :example
    # [...]
  end
end

You can rescue from exception like this:

class ApplicationController < ActionController::Base
  rescue_from InvalidParamsException do |exception|
    respond_to do |format|
      format.json { render json: { error: exception.to_s }, status: 400 }
      format.html { raise ActionController::RoutingError.new('Not found') }
    end

  end
end

Validate presence

validate_params! :user

validate_params! :user, :token

Validate type and size

validate_params! user: Array

validate_params! user: { type: Array }

validate_params! user: Array, token: String

validate_params! example: { type: Array, size: 2 }

Validate that value is included in a range

validate_params! number: { range: 0..10 }

Validate inclusion

validate_params! example: { in: %w(value1 value2) }

Validate regex

validate_params! example: { regex: /myregex/ }

Validation from custom Proc

validate_params! example: { custom: Proc.new { |value| value == 'a' } }

Set default value

validate_params! example: { default: 'abc' }

Cast

# :Integer :Float or :Array
validate_params! example: { cast: :Integer }

Todo

• Add a validate_params method (without !) that returns false
• Config custom exception class

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/rdelandesen/validate_params.

License

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