Index: app/models/project.rb
===================================================================
--- app/models/project.rb	(revision 12480)
+++ app/models/project.rb	(working copy)
@@ -710,7 +710,7 @@
   def copy(project, options={})
     project = project.is_a?(Project) ? project : Project.find(project)
 
-    to_be_copied = %w(wiki versions issue_categories issues members queries boards)
+    to_be_copied = %w(wiki versions issue_categories issues members queries boards documents)
     to_be_copied = to_be_copied & options[:only].to_a unless options[:only].nil?
 
     Project.transaction do
@@ -959,6 +959,20 @@
     end
   end
 
+  # Copies documents from +project+
+  def copy_documents(project)
+    project.documents.each do |document|
+      new_document = Document.new
+      new_document.attributes = document.attributes.dup.except("id", "project_id")
+      new_document.project = self
+      self.documents << new_document
+      # Copy attachments to document
+      new_document.attachments = document.attachments.map do |attachement|
+        attachement.copy(:container => new_document)
+      end
+    end
+  end
+
   def allowed_permissions
     @allowed_permissions ||= begin
       module_names = enabled_modules.loaded? ? enabled_modules.map(&:name) : enabled_modules.pluck(:name)
Index: app/views/projects/copy.html.erb
===================================================================
--- app/views/projects/copy.html.erb	(revision 12480)
+++ app/views/projects/copy.html.erb	(working copy)
@@ -10,6 +10,7 @@
   <label class="block"><%= check_box_tag 'only[]', 'issues', true %> <%= l(:label_issue_plural) %> (<%= @source_project.issues.count %>)</label>
   <label class="block"><%= check_box_tag 'only[]', 'queries', true %> <%= l(:label_query_plural) %> (<%= @source_project.queries.count %>)</label>
   <label class="block"><%= check_box_tag 'only[]', 'boards', true %> <%= l(:label_board_plural) %> (<%= @source_project.boards.count %>)</label>
+  <label class="block"><%= check_box_tag 'only[]', 'documents', true %> <%= l(:label_document_plural) %> (<%= @source_project.documents.count %>)</label>
   <label class="block"><%= check_box_tag 'only[]', 'wiki', true %> <%= l(:label_wiki_page_plural) %> (<%= @source_project.wiki.nil? ? 0 : @source_project.wiki.pages.count %>)</label>
   <%= hidden_field_tag 'only[]', '' %>
   <br />