Ruby on Rails

If you have your validations set, you can use something like

in User model:
scope :without_username, where(:username => nil)
validates :username, :uniqueness => true, :presence => false

and then use
users = User.without_username

users.each do |user|
username = user.email.split(/@/).first
user.username = username
while !user.valid?
user.username+=rand(10).to_s
end
user.save
end

tom

On Jul 9, 2012, at 15:01 , regedarek wrote:

> I would like to create rake task to set the username of all users' without a username to the part before the '@' in their email address. So if my email is test@email.eu, my username should become test. If it's not available, prepend it by a number (1).
>
> So i have problem witch checking uniqness of username. Code below isn`t working after second loop ex: when i have three emails: test@smt.com, test@smt.pl, test@oo.com username for test@oo.com will be empty.
>
> I have of course uniqness validation for username in User model.
>
> desc "Set username of all users wihout a username"
> task set_username_of_all_users: :environment do
> users_without_username = User.select{ |u| !u.username? }
> users_without_username.each do |user|
> username = user.email.split('@').first
> if User.find_by_username(username).blank?
> user.username = username
> user.save
> else
> User.find_by_username(username).each_with_index do |u, index|
> u.username = username.insert(0, index)
> u.save
> end
> end
> end
> end
>
> Other ideas are in Gist: https://gist.github.com/3067635#comments
>
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===============================================================================
Tomas Meinlschmidt, MS {MCT, MCP+I, MCSE, AER}, NetApp Filer/NetCache

www.meinlschmidt.com www.maxwellrender.cz www.lightgems.cz
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