Ruby on Rails: Validate contact form without model - ruby-on-rails

Question

I have a simple contact form that accepts the following fields (all should be required): Name, Email, phone, and message.
I also want to validate the email address.
Users should be given a response on whether or not the form submitted successfully, or if there are errors.
if so, display specific errors on the view.
This form is not connected to any database model. I'm not saving submissions. Only mailing.
I have a POST route set to contact_form in my PagesController
In my PagesController I have
def contact_form
UserMailer.contact_form(contact_form_params).deliver
end
In my UserMailer class I have:
def contact_form(params)
#formParams = params;
#date = Time.now
mail(
to: "support#example.com",
subject: 'New Contact Form Submission',
from: #formParams[:email],
reply_to: #formParams[:email],
)
end
This mails successfully, but there's no validation. I need to only run the mail block if validation passes. then return a response to the user.
Since I have no Model, I'm not sure how to do this. All the answers I see tell people to use validates on the ActiveRecord model.
With the few answers:
(note I've updated my params)
class UserMailerForm
include ActiveModel::Validations
def initialize(options)
options.each_pair{|k,v|
self.send(:"#{k}=", v) if respond_to?(:"#{k}=")
}
end
attr_accessor :first_name, :last_name, :email, :phone, :message
validates :first_name, :last_name, :email, :phone, :message, presence: true
validates :email, format: { with: URI::MailTo::EMAIL_REGEXP }
end
def contact_form
#form = UserMailerForm.new(contact_form_params)
if #form.valid?
UserMailer.contact_form(contact_form_params).deliver
else
logger.debug('invalid')
logger.debug(#form.valid?)
end
end
This sends mail when valid. However, I'm still unsure about sending info to the user

Answer 1

You can make UserMailer a model and use validations on that.
class UserMailer
include ActiveModel::Model # make it a model
include ActiveModel::Validations # add validations
attr_accessor :name, :email, :phone, :message
validates :name, :email, :phone, :message, presence: true
validates :email, format: { with: URI::MailTo::EMAIL_REGEXP }
def send_mail(subject:, to:)
mail(
to: to,
subject: subject,
from: email,
reply_to: email,
)
end
end
Then use it like any other model.
def UserMailersController < ApplicationController
def new
#user_mailer = UserMailer.new
end
def create
#user_mailer = UserMailer.new(params)
if #user_mailer.valid?
#user_mailer.send_mail(
to: "support#example.com",
subject: 'New Contact Form Submission',
)
else
# Use #user_mailer.errors to inform the user of their mistake.
render 'new'
end
end
end
If you have multiple forms associated with UserMailer, you can make separate classes to validate each Form's inputs and then pass them along to UserMailer. You'd likely still want validations on UserMailer regardless.

Answer 2

You can use ActiveModel::Validations on your PORO the same way AR does this.
class MyFormObject
include ActiveModel::Validations
def initialize(options)
options.each_pair{|k,v|
self.send(:"#{k}=", v) if respond_to?(:"#{k}=")
}
end
attr_accessor :name, :email, :phone, :message
validates :name, presence: true
# and so on...
end