Here’s something I discovered the other day:
ActiveRecord infers model attributes from the database. Each attribute gets a getter, setter, and query method.
A query method? I know this is true for boolean columns but non boolean columns?
class User < ActiveRecord::Base
end
users (id, name) # schema
def test_should_say_if_it_does_or_does_not_have_a_name_when_sent_name?
user = User.new
assert ! user.name?
user.name = ''
assert ! user.name?
user.name = 'name'
assert user.name?
end
You get that query method for free for each of your ActiveRecord attributes.
From this passing test it looks as if for strings its implemented in terms of
String#blank?
This is nice because it can save you an extra message.
if user.name.blank?
end
becomes
if ! user.name?
end
