https://yegorov.github.io/tags/heredoc/ Recent content in Heredoc on Artem Yegorov Hugo en Wed, 28 Jan 2026 05:15:01 +0000 https://yegorov.github.io/notes/rails-runner-export-tables-row-count/ Wed, 28 Jan 2026 05:15:01 +0000 https://yegorov.github.io/notes/rails-runner-export-tables-row-count/ <p>Anyone who works with Rails has heard of and used the <a href="https://guides.rubyonrails.org/command_line.html#bin-rails-runner" class="external-link" target="_blank" rel="noopener">runner command</a> with a single-line code argument that executes in the application context. While working on my application the other day, I needed to list all tables with their row counts. The code for listing the number of table rows on a single line looks rather ugly and unmaintainable. If you read the runner help (<code>bin/rails runner -h</code>), you&rsquo;ll see that runner can also read code from stdin. To pass multi-line code to runner, you can use a heredoc. To me, this looks absolutely stunning!</p>