FormWizard

FormWizard is a Ruby gem that provides a simple and flexible way to build multi-step forms (wizards) in Ruby on Rails applications. It leverages ActiveModel to handle validations and attribute management, making it easy to integrate with your existing models and controllers.

Features

• Multi-step forms: Easily define forms with multiple steps.
• Attribute management: Define attributes for each step with default values.
• Validations: Add validations specific to each step.
• Model synchronization: Automatically sync form attributes with your models.
• Session handling: Persist form data across requests using the session.
• Partial rendering: Render views based on the current step.

Example

This is a working example of a multi-step onboarding form. It uses the step method to define each step of the wizard.

Form object

# app/forms/onboarding_form.rb
class OnboardingForm < FormWizard::Form
  step :terms_and_conditions do
    attribute :toc_accepted
    validates :toc_accepted, acceptance: true
  end

  step :profile do
    attribute :name, on: :profile
    validates :name, presence: true, length: { minimum: 2 }

    attribute :account_name, on: :account, column: :name
    validates :account_name, presence: true, length: { minimum: 5 }, allow_blank: true

    attribute :locale, on: :user
    attribute :time_zone, on: :user
  end

  def persist
    self.account_name = name if account_name.blank?

    ActiveRecord::Base.transaction do
      user.save!
      Member.create!(user: user, account: account, owner: true)
    end
  end
end

Installation

Add this line to your application's Gemfile:

gem "form_wizard"

and then execute:

bundle install

Model synchronization

Pass a model object to the form

# Pass an instance of Profile to the form object:
@profile = current_user.profile
@form = OnboardingForm.new(models: { profile: @profile })

This allows us to synchronize form attributes with your models using the :on option when defining form attributes:

step :profile do
  attribute :name, on: :profile
end

FormWizard handles synchronization with the models attributes automatically. You can access the updated object inside the persist method:

def persist
  profile.save!
end

Validations

Validations can be added within each step using the validates method. These validations are conditional and only run on the current step.

step :terms do
  validates :toc_accepted, acceptance: true
end