queries.rb

Zoo.find(:all, :conditions => ['num_employees between ? and ?', 100 , 300])

Zoo.find(:all, :conditions => ['name = ?', 'Dallas'])

User.find(:first, :conditions => ['age between ? and ?', 10, 20])

Zoo.where do
    :num_employees.is.between [100, 300]
end

Zoo.where do
    :name.is == 'Dallas'
end

User.where do
    :age.from {10 => 20}
end