How to set up usernames from email of all users?

[regedarek]

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 te...@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: te...@smt.com, te...@smt.pl, te...@oo.com username for te...@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

[Tom Meinlschmidt]

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

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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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[regedarek]

But what if I would like to have usernames with increasing prefix this "test", "1test", "2test"

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[Tom Meinlschmidt]

then try something like (replace while)

users.each do |user|
username = user.email.split(/@/).first

prefix = 1
while !user.valid?
user.username=prefix.to_s+username
prefix+=1
end
user.save
end

tom

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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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