_form.html.erb

<!-- app/views/inquiries/_form.html.erb -->

<%= form_for inquiry do |f| %>
  <div>
    <%= f.label :name %><br/>
    <%= f.text_field :name %>
  </div>
  
  <div>
    <%= f.label :email %><br/>
    <%= f.text_field :email %>
  </div>
  
  <div>
    <%= f.label :message %><br/>
    <%= f.text_area :message %>
  </div>
  
  <div>
    <%= f.submit "Send" %>
  </div>
<% end %>

_form2.html.erb

<!-- app/views/inquiries/_form.html.erb -->

<%= form_for inquiry do |f| %>
  <% if inquiry.errors.any? %>
    <ul>
      <% inquiry.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
    </ul>
  <% end %>
  
  <div>
    <%= f.label :name %><br/>
    <%= f.text_field :name %>
  </div>
  
  <div>
    <%= f.label :email %><br/>
    <%= f.text_field :email %>
  </div>
  
  <div>
    <%= f.label :message %><br/>
    <%= f.text_area :message %>
  </div>
  
  <div>
    <%= f.submit "Send" %>
  </div>
<% end %>

inquiries_controller.rb

# app/controllers/inquiries_controller.rb

class InquiriesController < ApplicationController
  
  def new
    @inquiry = Inquiry.new
  end
    
  def create
    @inquiry = Inquiry.new(params[:inquiry])
    if @inquiry.deliver
      render :thank_you
    else
      render :new
    end
  end
  
end

inquiry.rb

# app/models/inquiry.rb

class Inquiry
  extend ActiveModel::Naming
  include ActiveModel::Conversion
  
  attr_accessor :name, :email, :message
  
  def initialize(attributes = {})
    attributes.each do |name, value|
      send("#{name}=", value)
    end
  end
  
  def deliver
    true
  end
      
  def persisted?
    false
  end
end

inquiry2.rb

# app/models/inquiry.rb

class Inquiry
  extend ActiveModel::Naming
  include ActiveModel::Conversion
  include ActiveModel::Validations
  
  attr_accessor :name, :email, :message
  
  validates :name, 
            :presence => true
  
  validates :email,
            :format => { :with => /\b[A-Z0-9._%a-z\-]+@(?:[A-Z0-9a-z\-]+\.)+[A-Za-z]{2,4}\z/ }
  
  validates :message,
            :length => { :minimum => 10, :maximum => 1000 }
  
  def initialize(attributes = {})
    attributes.each do |name, value|
      send("#{name}=", value)
    end
  end
  
  def deliver
    return false unless valid?
    true
  end
      
  def persisted?
    false
  end
end

inquiry3.rb

# app/models/inquiry.rb

class Inquiry
  extend ActiveModel::Naming
  include ActiveModel::Conversion
  include ActiveModel::Validations
  include ActionView::Helpers::TextHelper
  
  attr_accessor :name, :email, :message
  
  validates :name, 
            :presence => true
  
  validates :email,
            :format => { :with => /\b[A-Z0-9._%a-z\-]+@(?:[A-Z0-9a-z\-]+\.)+[A-Za-z]{2,4}\z/ }
  
  validates :message,
            :length => { :minimum => 10, :maximum => 1000 }
  
  def initialize(attributes = {})
    attributes.each do |name, value|
      send("#{name}=", value)
    end
  end
  
  def deliver
    return false unless valid?
    Pony.mail({
      :from => %("#{name}" <#{email}>),
      :reply_to => email,
      :subject => "Website inquiry",
      :body => message,
      :html_body => simple_format(message)
    })
  end
      
  def persisted?
    false
  end
end

new.html.erb

<!-- app/views/inquiries/new.html.erb -->

<h1>Want to get in touch?</h1>
<p>Please fill out the form below and we'll get back to you as soon as possible.</p>

<%= render 'form', :inquiry => @inquiry %>

pony.rb

# config/initializers/pony.rb

Pony.options = {
  :to => 'you@example.com',
  :via => :smtp,
  :via_options => {
    :address              => 'smtp.gmail.com',
    :port                 => '587',
    :enable_starttls_auto => true,
    :user_name            => 'user',
    :password             => 'password',
    :authentication       => :plain, # :plain, :login, :cram_md5, no auth by default
    :domain               => "localhost.localdomain" # the HELO domain provided by the client to the server
  }
}

routes.rb

# config/routes.rb

resources :inquiries, :only => [:new, :create] do
  get 'thank_you', :on => :collection
end

thank_you.html.erb

<!-- app/views/inquiries/thank_you.html.erb -->

<h1>Thank you!</h1>
<p>Your inquiry has been sent and we'll be in touch as soon as possible.</p>