Redmine

Information
Redmine 2.1.2
Ruby version 1.9.3 (x86_64-linux)
RubyGems version 1.8.24
Rack version 1.4
Rails version 3.2.8
Active Record version 3.2.8
Action Pack version 3.2.8
Active Resource version 3.2.8
Action Mailer version 3.2.8
Active Support version 3.2.8
Environment production
Database adapter mysql2

Database: mysql Ver 14.16 Distrib 5.2.12-MariaDB, for suse-linux-gnu (x86_64) using readline 5.1

Problem
When you copy a project that it doesn't have the wiki module activated, the copy crash. When you copy a project that have the wiki module activated there's no problem.

Code
In app/models/project.rb

def copy_wiki(project)
    # Check that the source project has a wiki first
    unless project.wiki.nil?
      self.wiki ||= Wiki.new
      wiki.attributes = project.wiki.attributes.dup.except("id", "project_id")
      wiki_pages_map = {}

      project.wiki.pages.each do |page|
        # Skip pages without content
        next if page.content.nil?
        new_wiki_content = WikiContent.new(page.content.attributes.dup.except("id", "page_id", "updated_on"))
        new_wiki_page = WikiPage.new(page.attributes.dup.except("id", "wiki_id", "created_on", "parent_id"))
        new_wiki_page.content = new_wiki_content
        wiki.pages << new_wiki_page
        wiki_pages_map[page.id] = new_wiki_page
      end

      wiki.save
      # Reproduce page hierarchy
      project.wiki.pages.each do |page|
        if page.parent_id && wiki_pages_map[page.id]
          wiki_pages_map[page.id].parent = wiki_pages_map[page.parent_id]
          wiki_pages_map[page.id].save
        end
      end
    end
  end

if you change the code it works correctly

def copy_wiki(project)
    # Check that the source project has a wiki first
    unless project.wiki.nil?
      wiki = Wiki.new
      wiki.attributes = project.wiki.attributes.dup.except("id", "project_id")
      wiki_pages_map = {}

      project.wiki.pages.each do |page|
        # Skip pages without content
        next if page.content.nil?
        new_wiki_content = WikiContent.new(page.content.attributes.dup.except("id", "page_id", "updated_on"))
        new_wiki_page = WikiPage.new(page.attributes.dup.except("id", "wiki_id", "created_on", "parent_id"))
        new_wiki_page.content = new_wiki_content
        wiki.pages << new_wiki_page
        wiki_pages_map[page.id] = new_wiki_page
      end

      self.wiki = wiki
      wiki.save
      # Reproduce page hierarchy
      project.wiki.pages.each do |page|
        if page.parent_id && wiki_pages_map[page.id]
          wiki_pages_map[page.id].parent = wiki_pages_map[page.parent_id]
          wiki_pages_map[page.id].save
        end
      end
    end
  end

Error log
Started POST "/projects/prova/copy" for 127.0.0.1 at 2013-02-07 11:54:14 +0100
Processing by ProjectsController#copy as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"R/TuuUitlFGsay8MNeshen6pJWpRaquVDl+fyFTVMN8=", "project"=>{"name"=>"testttt", "parent_id"=>"", "description"=>"dasdas", "identifier"=>"testttt", "homepage"=>"", "is_public"=>"0", "custom_field_values"=>{"1"=>"prova"}, "enabled_module_names"=>["issue_tracking", "time_tracking", "news", "documents", "files", "repository", "boards", "calendar", "gantt", "alfresco", "wiki_extensions", ""], "tracker_ids"=>["1", "2", "3", ""]}, "only"=>["members", "versions", "issue_categories", "issues", "queries", "boards", "wiki", ""], "commit"=>"Copia", "id"=>"prova"}
[1m[36m (0.4ms)[0m [1mSELECT MAX AS max_id FROM `settings` [0m
[1m[35mUser Load (0.6ms)[0m SELECT `users`.* FROM `users` WHERE `users`.`type` IN ('User', 'AnonymousUser') AND `users`.`id` = 3 AND (users.status = 1) LIMIT 1
Current user: gtanya (id=3)
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[1m[35mProject Load (0.4ms)[0m SELECT `projects`.* FROM `projects` ORDER BY `rgt` desc LIMIT 1 FOR UPDATE
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[1m[35mEnabledModule Exists (0.5ms)[0m SELECT 1 AS one FROM `enabled_modules` WHERE (`enabled_modules`.`name` = BINARY 'issue_tracking' AND `enabled_modules`.`project_id` = 87) LIMIT 1
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[1m[35mEnabledModule Exists (0.2ms)[0m SELECT 1 AS one FROM `enabled_modules` WHERE (`enabled_modules`.`name` = BINARY 'alfresco' AND `enabled_modules`.`project_id` = 87) LIMIT 1
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[1m[35mEnabledModule Exists (0.2ms)[0m SELECT 1 AS one FROM `enabled_modules` WHERE (`enabled_modules`.`name` = BINARY 'wiki_extensions' AND `enabled_modules`.`project_id` = 87) LIMIT 1
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[1m[35m (0.1ms)[0m INSERT INTO `projects_trackers` (`project_id`, `tracker_id`) VALUES (87, 1)
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[1m[36m (14.6ms)[0m [1mROLLBACK[0m
Completed 500 Internal Server Error in 121ms

ActiveRecord::RecordNotSaved (Failed to save the new associated wiki.):
app/models/project.rb:724:in `copy_wiki'
app/models/project.rb:675:in `block (2 levels) in copy'
app/models/project.rb:674:in `each'
app/models/project.rb:674:in `block in copy'
app/models/project.rb:671:in `copy'
app/controllers/projects_controller.rb:128:in `block in copy'
app/models/mailer.rb:364:in `with_deliveries'
app/controllers/projects_controller.rb:125:in `copy'