datetime = DateTime.now date = datetime.to_date #or Date.today will assert: datetime.is_a? Date == true datetime.is_a? DateTime == true datetime.instance_of...

As you know, time zones make stuff a bit more difficult but are necessary. A time-zoned record is converted...

require 'ruby-prof' # you don't need this if you have ruby-prof in your Gemfile You can set one...

The object returned by has_defaults apparently is the same between multiple object creations. Consider this scenario:

Wether you modify an existing named scope or add a new one, or when you write a new query, make...

When simply checking equality or truthiness then Instead of: it "should have role set to admin" do @user.role.should eql('admin...

One of the main source of bugs and complexity in the code is when a functional method (that we expect...

Whenever you make a migration to add a foreign key, you should also add an index for it

Go to lib folder and use bundler to generate main files for a gem: $ bundle gem test_gem create test...

Regularly, but at least before merging your feature branches, rebase them to get rid of "fix typo" and "wip" commits...

It's a good pratice to chain several named scopes like: Property.listable.for_2_or_more_guests.best_10_properties Now, to make the lesson more...