To enable stdout flush.
ref. https://hawksnowlog.blogspot.com/2019/04/dose-not-show-puts-output-on-docker.html
Parse DATABASE_URL
URI for establish_connection
.
$stdout = IO.new(IO.sysopen("/proc/1/fd/1", "w"), "w") | |
$stdout.sync = true | |
require "active_record" | |
I18n.enforce_available_locales = false | |
require "uri" | |
ActiveRecord::Base.establish_connection ENV["DATABASE_URL"] | |
# Write your code | |
class YourModel < ActiveRecord::Base; end | |
puts YourModel.count |
FROM ruby | |
COPY ["Gemfile", "Gemfile.lock", "app.rb", "/"] | |
RUN bundle | |
CMD ["ruby", "/app.rb"] |
source "https://rubygems.org" | |
gem "activerecord" | |
gem "pg" |
To enable stdout flush.
ref. https://hawksnowlog.blogspot.com/2019/04/dose-not-show-puts-output-on-docker.html
Parse DATABASE_URL
URI for establish_connection
.
# to generate Gemfile.lock | |
bundle | |
docker image build . -t your-image-name | |
docker container run --rm -e DATABASE_URL=postgres://username:password@host:5432/databasename your-image-name |