# syntax = docker/dockerfile:1 FROM ruby:slim as build RUN apt-get update &&\ apt-get install --yes build-essential git pkg-config redis RUN gem install rails RUN rails new demo --css tailwind FROM ruby:slim COPY --from=build /demo /demo COPY --from=build /usr/local/bundle /usr/local/bundle WORKDIR demo RUN bin/rails generate model Visitor counter:integer &&\ bin/rails generate channel counter COPY <<-"EOF" app/controllers/visitors_controller.rb class VisitorsController < ApplicationController def counter @visitor = Visitor.find_or_create_by(id: 1) @visitor.update! counter: @visitor.counter.to_i + 1 @visitor.broadcast_replace_later_to 'counter', partial: 'visitors/counter' end end EOF COPY <<-"EOF" app/views/visitors/counter.html.erb <%= turbo_stream_from 'counter' %>
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<%= render "counter", visitor: @visitor %>
EOF COPY <<-"EOF" app/views/visitors/_counter.html.erb <%= turbo_frame_tag(dom_id visitor) do %> <%= visitor.counter.to_i %> <% end %> EOF COPY <<-"EOF" config/routes.rb Rails.application.routes.draw { root "visitors#counter" } EOF ENV RAILS_ENV=production RUN bin/rails assets:precompile RUN bin/rails db:prepare EXPOSE 3000 ENV RAILS_LOG_TO_STDOUT=true ENV RAILS_SERVE_STATIC_FILES=true CMD bin/rails server