Rails No Hotwire

_show.html.erb

<%= button_to switch_path do %>
    <%= switch.state %>
    <%= hidden_field_tag :state, switch.state %>
<% end %>

switch.rb

class Switch 

    def state 
        @state
    end

    def state= (value)
        @state = value 
    end 

    def save 
        File.open(Switch.switch_path, "w+") do |f|
            f.write(@state)
        end
    end

    def self.load
        switch = Switch.new
        switch.state = File.read(switch_path)

        switch
    end

    private 

    def self.switch_path
        File.join(Rails.root, 'tmp', 'switch.txt')
    end

end

switch_controller.rb

class SwitchController < ApplicationController
    before_action :set_switch

    def update 
        if params[:state] == 'on'
            @switch.state = 'off'
        else
            @switch.state = 'on'
        end

        @switch.save

        render partial: 'show', locals: { switch: @switch }
    end

    def show 
        render partial: 'show', locals: { switch: @switch }
    end

    private

    def set_switch
        @switch = Switch.load 
    end

end