Added option to automaticaly generate passwords for new users.

app/assets/javascripts/admin.js

+$(document).ready(function(){
+    $('input#user_force_random_password').on('change', function(elem) {
+        var elems = $('#user_password, #user_password_confirmation');
+        
+        if ($(this).attr('checked')) {
+            elems.val('').attr('disabled', true);
+        } else {
+            elems.removeAttr('disabled');
+        }
+    });
+});

app/models/user.rb

@@ -5,7 +5,10 @@ class User < ActiveRecord::Base
          :recoverable, :rememberable, :trackable, :validatable, :omniauthable
 
   attr_accessible :email, :password, :password_confirmation, :remember_me, :bio,
-                  :name, :projects_limit, :skype, :linkedin, :twitter, :dark_scheme, :theme_id
+                  :name, :projects_limit, :skype, :linkedin, :twitter, :dark_scheme, 
+                  :theme_id, :force_random_password
+
+  attr_accessor :force_random_password
 
   has_many :users_projects, :dependent => :destroy
   has_many :projects, :through => :users_projects
@@ -56,7 +59,7 @@ class User < ActiveRecord::Base
   before_validation :generate_password, :on => :create
 
   def generate_password
-    if self.password.blank? && self.password_confirmation.blank?
+    if self.force_random_password == true
       self.password = self.password_confirmation = Devise.friendly_token.first(8)
     end
   end

app/views/admin/users/_form.html.haml

@@ -18,12 +18,21 @@
           .input
             = f.text_field :email
             %span.help-inline * required
-        .clearfix
-          = f.label :password
-          .input= f.password_field :password
-        .clearfix
-          = f.label :password_confirmation
-          .input= f.password_field :password_confirmation
+        %hr
+
+        -if f.object.new_record?
+          .clearfix 
+            = f.label :admin, :class => "checkbox" do
+              = f.check_box :force_random_password
+            %span Generate random password
+        
+        %div.password-fields
+          .clearfix
+            = f.label :password
+            .input= f.password_field :password, :disabled => f.object.force_random_password 
+          .clearfix
+            = f.label :password_confirmation
+            .input= f.password_field :password_confirmation, :disabled => f.object.force_random_password
         %hr
         .clearfix
           = f.label :skype

spec/models/user_spec.rb

@@ -22,10 +22,22 @@ describe User do
     user.identifier.should == "test_mail_com"
   end
 
-  it "should generate password when password is empty" do
-    user = User.create(:email => "test1@mail.com")
-    user.password.should eql(user.password_confirmation)
-    user.password.should_not be_empty
+  it "should execute callback when force_random_password specified" do
+    user = User.new(:email => "test@mail.com", :force_random_password => true)
+    user.should_receive(:generate_password)
+    user.save
+  end
+
+  it "should not generate password by default" do
+    user = Factory(:user, :password => 'abcdefg', :password_confirmation => 'abcdefg')
+    user.password.should == 'abcdefg'
+  end
+
+  it "should generate password when forcing random password" do
+    Devise.stub(:friendly_token).and_return('123456789')
+    user = User.create(:email => "test1@mail.com", :force_random_password => true)
+    user.password.should == user.password_confirmation
+    user.password.should == '12345678'
   end
 
   it "should have authentication token" do