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Rails Pro Tips
Q: What are the components of Rails? Where do I find things?
A: The actionmailer directory contains the ActionMailer library code. It is
in charge of sending out emails. If you need to deal with emails, look there.
The actionpack directory contains the ActionPack library. It is in charge of
routing requests to the correct controller. It also contains the request and
response class, as well as the controller base class that applications subclass.
The actionview directory contains the ActionView library. ActionView is in
charge of templating. It contains logic for assembling HTML responses from
templates.
The activerecord directory contains the ActiveRecord library. ActiveRecord is
the ORM that ships with Rails. It is in charge of interfacing with the
database, defining the schema inside Rails, etc. When you need to deal with
data persistence, this is where you look.
The activemodel directory contains the ActiveModel library. ActiveModel is
just an interface. ActiveRecord implements that interface. You shouldn't have
to deal with ActiveModel much at all.
The activesupport directory contains the ActiveSupport library. ActiveSupport
extends the Ruby language with things that make developing web applications
easier. If you see a method that is non-standard Ruby, it is probably defined
in ActiveSupport.
The railties directory contains "Railties". The code in here is in charge of
tying together an application. It processes configuration, rake tasks, and
managing startup of the application.
Q: I would like to run all tests? How do I do that?
A: You can run rake test from the rails directory to run all tests. If you
need to focus on ActionPack, just cd to the actionpack directory and run rake test. This is true for each component besides ActiveRecord.
Q: I would like to run the AR tests. How do I do that?
A: You can run all AR tests by running rake test, but this will run the tests
for each database. If you want to run just the SQlite3 tests, do rake test_sqlite. If you want to run the mysql tests, do rake test_mysql, etc.
Q: I would like to run just one file. How do I do that?
A: There are two ways to do it. One with just plain ruby like this:
ruby -I lib:test test/path/to/testfile.rb
The other is with rake like this:
rake test TEST=/test/path/to/testfile.rb
Q: I would like to run just one file. How do I do that?
A: Provide the -n flag along with the method name, like this:
ruby -I lib:test test/path/to/testfile.rb -n test_sometest
or like this:
rake test TEST='/test/path/to/testfile.rb -n test_sometest'