> For the complete documentation index, see [llms.txt](https://wiki.christianpoplawski.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.christianpoplawski.de/ruby-on-rails/file-io.md).

# file-io

Things regarding the input and output in a rials application.

## Table of Contents

* [Importing CSV Files](/ruby-on-rails/file-io.md#importing-csv-files)

## Importing CSV Files

Rails has a lot of support built on for handling CSV (both, in- and output), have a look at the [CSV Class](https://ruby-doc.org/stdlib-2.0.0/libdoc/csv/rdoc/CSV.html).

While importing CSV Files, the most memory-efficient method is to use `CSV.foreach()`, which reads the file line per line (see [this article](https://dalibornasevic.com/posts/68-processing-large-csv-files-with-ruby) for more information about the performance of importing CSV files).