NameError (uninitialized constant Welcome4Controller::EmailMe2Mailer): RAILS - ruby-on-rails

Question

I have a simple ruby on rails form that is posted with ajax. However, I keep receiving this error:
NameError (uninitialized constant Welcome4Controller::EmailMe2Mailer):
app/controllers/welcome4_controller.rb:3:in `contact'
This is the form:
<%= form_for :contact, :remote => true, :method => :post, html: {:class => "form-stacked", id: 'contact_form' } do |f| %>
<div class="col-md-6">
<div class="input-group input-group-lg wow fadeInUp" data-wow-delay='0.8s'>
<span class="input-group-addon" id="sizing-addon1">
<i class="fa fa-user" aria-hidden="true"></i>
</span>
<input type="text" class="form-control" aria-describedby='sizing-addon1' placeholder="Full Name" name="fullname" id="fullname" required>
</div>
<div class="input-group input-group-lg wow fadeInUp" data-wow-delay='1.2s'>
<span class="input-group-addon" id="sizing-addon1">
<i class="fa fa-envelope" aria-hidden="true"></i>
</span>
<input class="form-control" aria-describedby='sizing-addon1' placeholder="Email Address" required name="email" id="email">
</div>
<div class="input-group input-group-lg wow fadeInUp" data-wow-delay='1.6s'>
<span class="input-group-addon" id="sizing-addon1">
<i class="fa fa-phone" aria-hidden="true"></i>
</span>
<input class="form-control" aria-describedby='sizing-addon1' placeholder="Phone Number (optional)" name="phone" id="phone">
</div>
</div>
<div class="col-md-6">
<div class="input-group wow fadeInUp" data-wow-delay='2s'>
<textarea class="form-control" cols="80" rows="6" name="message" placeholder="Type here..." style="width:100%" id="message" required></textarea>
</div>
<button class="btn btn-lg wow fadeInUp" data-wow-delay='2.4s' id="contact_btn"data-loading-text="<i class='fa fa-circle-o-notch fa-spin'></i> Sending" >Send Your Message</button>
</div>
<% end %>
This is the controller:
class Welcome4Controller < ApplicationController
def contact
EmailMe2Mailer.confirmation_2(params[:fullname,:email,:phone,:message]).deliver_now
render json: { success: true }, status: 200
end
def index
end
end
This is the mailer:
class EmailMe2Mailer < ApplicationMailer
default from: "**#gmail.com"
def confirmation_2(fullname,email,phone,message)
#greeting = "Hi"
#fullname = fullname
#email = email
#phone = phone
#message = message
mail to: "**#gmail.com", subject: "contact email"
end
end
This is the ajax call:
$('#contact_form').submit(function(e) {
e.preventDefault();
}).validate({
rules: {
fullname: {
required: true,
},
email: {
required: true,
email: true
},
message: {
required: true,
minlength: 5
}
},
submitHandler: function (form) {
var btn = $('#contact_btn');
btn.button('loading');
setTimeout(function() {
btn.button('reset');
}, 8000);
$.ajax({
type: 'POST',
url: '/contact',
// data: form.serialize(),
dataType: 'json',
async: true,
data: {
fullname: $('#fullname').val(),
email: $('#email').val(),
phone: $('#phone').val(),
message: $('#message').val()
},
success: function (json) {
$('#contact').hide();
$('#output').html(
'<i class="fa fa-check" aria-hidden="true" id="check" style="border-radius:50%;font-size:80px;text-align:center;color:#E81B00"></i><br><p class="lead" style="font-size:40px;">We have received your message!</p>'
).show();
}
});
return false; // for demo
}
});
It is basically complaining about passing multiple arguments to the mailer here:
EmailMe2Mailer.confirmation_2(params[:fullname,:email,:phone,:message]).deliver_now
This is where EmailMe2Mail is located:
app => mailers => email_me_2_mailer.rb
this is application_mail.rb
class ApplicationMailer < ActionMailer::Base
default from: '**#gmail.com'
layout 'mailer'
end

Answer 1

NameError (uninitialized constant Welcome4Controller::EmailMe2Mailer):
This is because of the file name being wrong. It should be email_me2_mailer.rb whereas you have it like email_me_2_mailer.rb Changing it to email_me2_mailer.rb should fix your problem.
Normally Rails expects the file names to be in snake_case with respect to the class names being CamelCase. You can use underscore to check the snake_case string for EmailMe2Mailer like below
"EmailMe2Mailler".underscore
=> "email_me2_mailler"