The easiest and recommended way to get a development environment ready to hack is to use the [Rails development box](https://github.com/rails/rails-dev-box).
The Hard Way
------------
In case you can't use the Rails development box, see section above, these are the steps to manually build a development box for Ruby on Rails core development.
### Install Git
Ruby on Rails uses Git for source code control. The [Git homepage](http://git-scm.com/) has installation instructions. There are a variety of resources on the net that will help you get familiar with Git:
* [GitHub](http://help.github.com) offers links to a variety of Git resources.
* [Pro Git](http://git-scm.com/book) is an entire book about Git with a Creative Commons license.
### Clone the Ruby on Rails Repository
Navigate to the folder where you want the Ruby on Rails source code (it will create its own `rails` subdirectory) and run:
```bash
$ git clone git://github.com/rails/rails.git
$ cd rails
```
### Set up and Run the Tests
The test suite must pass with any submitted code. No matter whether you are writing a new patch, or evaluating someone else's, you need to be able to run the tests.
Install first libxml2 and libxslt together with their development files for Nokogiri. In Ubuntu that's
If you have any problems with these libraries, you can install them manually by compiling the source code. Just follow the instructions at the [Red Hat/CentOS section of the Nokogiri tutorials](http://nokogiri.org/tutorials/installing_nokogiri.html#red_hat__centos) .
If you want to run the tests located in a specific directory use the `TEST_DIR` environment variable. For example, this will run the tests in the `railties/test/generators` directory only:
The test suite of Active Record attempts to run four times: once for SQLite3, once for each of the two MySQL gems (`mysql` and `mysql2`), and once for PostgreSQL. We are going to see now how to set up the environment for them.
WARNING: If you're working with Active Record code, you _must_ ensure that the tests pass for at least MySQL, PostgreSQL, and SQLite3. Subtle differences between the various adapters have been behind the rejection of many patches that looked OK when tested only against MySQL.
#### Database Configuration
The Active Record test suite requires a custom config file: `activerecord/test/config.yml`. An example is provided in `activerecord/test/config.example.yml` which can be copied and used as needed for your environment.
#### MySQL and PostgreSQL
To be able to run the suite for MySQL and PostgreSQL we need their gems. Install first the servers, their client libraries, and their development files. In Ubuntu just run
First, we need to delete `.bundle/config` because Bundler remembers in that file that we didn't want to install the "db" group (alternatively you can edit the file).
NOTE: Using the rake task to create the test databases ensures they have the correct character set and collation.
NOTE: You'll see the following warning (or localized warning) during activating HStore extension in PostgreSQL 9.1.x or earlier: "WARNING: => is deprecated as an operator".
If you're using another database, check the file `activerecord/test/config.yml` or `activerecord/test/config.example.yml` for default connection information. You can edit `activerecord/test/config.yml` to provide different credentials on your machine if you must, but obviously you should not push any such changes back to Rails.