Simple Validate

PORO validation mixin with no deps - borrowing ideas from validatable

Features

Similar API to Rails
No other dependencies

Usage

require 'simple_validate'

class Person
  include SimpleValidate
  attr_accessor :name, :age
  
  validates_presence_of :name, :age
  validates_type_of :age, as: :integer
end

=> p = Person.new
=> #<Person:0x007f9431536408>
=> p.valid?
=> false
=> p.errors
=> #<SimpleValidate::Errors:0x007f94318b4df0
 @messages=
  {:age=>["can't be empty", "must be an integer"],
   :name=>["can't be empty"]}>

Presence

  validates_presence_of :attribute

Type

  validates_type_of :attribute, as: :string

Format

  validates_format_of :attribute, with: /[A-Z]+/

Length

Possible length options include: maximum, minimum, in, is.
maximum, minimum and is take a single integer and in takes a range.

  validates_length_of :attribute, in: 6..9

Inclusion and Exclusion

in can take a Range or an Array

  validates_inclusion_of :domain, in: [:net, :com]
  validates_inclusion_of :number, in: 5..10
  validates_exclusion_of :name, in: [:Bojack, :Horseman]

Options

Allow nil

    validates_type_of :attribute, as: :string, allow_nil: true

Custom error messages

It is possible to pass a custom error message to any validation.

  validates_presence_of :attribute, message: 'attribute is required!'

Conditional validation

It is possible to pass an if option with a proc for a conditional validation

  validates_presence_of :attribute, if: Proc.new { true }

Installation

gem 'simple_validate'

License

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