How to make a "Request a call" form without reloading the page?

Question

Ruby on Rails

Hello.
I'm trying to implement the "Request a call" form. The form is on every page. I do according to the "Model without a table in the database" method. (I did not find another way) I immediately had problems with the fact that I could not bind the form to the model object. I had to do this (I read that it is not recommended to do this)

= form_for Message.new do |f|
...

If a

= form_for @message do |f|
...

then "First argument in form cannot contain nil or be empty" swears, although everything seems to be correct in the controller.
Actually the question is different now. Is it possible to make the form not reload the page after submitting the data? At the moment, it throws on the same page from which data is sent only with POST, which of course I don’t have.
Model

class Message
  include ActiveModel::Validations
  include ActiveModel::Conversion
  extend ActiveModel::Naming

  attr_accessor :name, :phone

  validates_presence_of :name
  validates_format_of :phone, :with => /\A[0-9]{10}\Z/, :allow_blank => true, :allow_nil => true

  def initialize(attributes = {})
    attributes.each do |name, value|
      send("#{name}=", value)
    end
  end

  def persisted?
    false
  end
end

Controller

class MessagesController < ApplicationController
  def new
    @message = Message.new
  end

  def create
    @message = Message.new(params[:message])
    if @message.valid?
      UserMailer.create_page(@page).deliver
      flash[:notice] = "Message sent"
    else
      render :new
    end
  end
end

In routes I have done so far resources :messages
Regards.

Answer 1

1. This form is rendered on every page, so the @message variable must also be set on every page, not just in the Messages controller . That is, if you display this form on the page of posts and a specific post, then in some PostsController in the show and index methods this variable must also be defined.
2. In order for the form not to reload the page, it is enough to pass the remote: true parameter to it . And what to do after the submission, describe in the appropriate JS view (for example, messages/create.js.erb )

= form_for @message, remote: true do |f|
...

Read more here: edgeguides.rubyonrails.org/working_with_javascript...

Answer 2

I did something similar. I just didn’t use js view, but sent it immediately from the controller.
But couldn't make it work.
something like

@message = Message.new(params[:message])
@company = Company.friendly.find(params[:name])

if @message.valid?
  UserMailer.call(@company).deliver
  render json: @message, status: :ok
else
  render json: @message.errors, status: :unprocessable_entity
end

How can I get @company? writes Couldn't find Company without an ID.
Using the FriendlyId gem, respectively, in a model without a table, it is not possible to connect FriendlyId, writes undefined method `relation' for class `Class'.