Ask user what to do with child pages when deleting a parent wiki page (#3202).

3 options are available:
* move child pages as root pages
* move child pages to another parent page
* delete all descendants

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2676 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/wiki_controller.rb

@@ -131,9 +131,31 @@ class WikiController < ApplicationController
     render_404 unless @annotate
   end
   
-  # remove a wiki page and its history
+  # Removes a wiki page and its history
+  # Children can be either set as root pages, removed or reassigned to another parent page
   def destroy
     return render_403 unless editable?
+    
+    @descendants_count = @page.descendants.size
+    if @descendants_count > 0
+      case params[:todo]
+      when 'nullify'
+        # Nothing to do
+      when 'destroy'
+        # Removes all its descendants
+        @page.descendants.each(&:destroy)
+      when 'reassign'
+        # Reassign children to another parent page
+        reassign_to = @wiki.pages.find_by_id(params[:reassign_to_id].to_i)
+        return unless reassign_to
+        @page.children.each do |child|
+          child.update_attribute(:parent, reassign_to)
+        end
+      else
+        @reassignable_to = @wiki.pages - @page.self_and_descendants
+        return
+      end
+    end
     @page.destroy
     redirect_to :action => 'special', :id => @project, :page => 'Page_index'
   end

app/helpers/wiki_helper.rb

@@ -17,6 +17,19 @@
 
 module WikiHelper
   
+  def wiki_page_options_for_select(pages, selected = nil, parent = nil, level = 0)
+    s = ''
+    pages.select {|p| p.parent == parent}.each do |page|
+      attrs = "value='#{page.id}'"
+      attrs << " selected='selected'" if selected == page
+      indent = (level > 0) ? ('&nbsp;' * level * 2 + '&#187; ') : nil
+      
+      s << "<option value='#{page.id}'>#{indent}#{h page.pretty_title}</option>\n" + 
+             wiki_page_options_for_select(pages, selected, page, level + 1)
+    end
+    s
+  end
+  
   def html_diff(wdiff)
     words = wdiff.words.collect{|word| h(word)}
     words_add = 0

app/models/wiki_page.rb

@@ -22,7 +22,7 @@ class WikiPage < ActiveRecord::Base
   belongs_to :wiki
   has_one :content, :class_name => 'WikiContent', :foreign_key => 'page_id', :dependent => :destroy
   acts_as_attachable :delete_permission => :delete_wiki_pages_attachments
-  acts_as_tree :order => 'title'
+  acts_as_tree :dependent => :nullify, :order => 'title'
   
   acts_as_event :title => Proc.new {|o| "#{l(:label_wiki)}: #{o.title}"},
                 :description => :text,

app/views/wiki/destroy.rhtml

@@ -0,0 +1,19 @@
+<h2><%=h @page.pretty_title %></h2>
+
+<% form_tag({}) do %>
+<div class="box">
+<p><strong><%= l(:text_wiki_page_destroy_question, :descendants => @descendants_count) %></strong></p>
+<p><label><%= radio_button_tag 'todo', 'nullify', true %> <%= l(:text_wiki_page_nullify_children) %></label><br />
+<label><%= radio_button_tag 'todo', 'destroy', false %> <%= l(:text_wiki_page_destroy_children) %></label>
+<% if @reassignable_to.any? %>
+<br />
+<label><%= radio_button_tag 'todo', 'reassign', false %> <%= l(:text_wiki_page_reassign_children) %></label>:
+<%= select_tag 'reassign_to_id', wiki_page_options_for_select(@reassignable_to),
+																 :onclick => "$('todo_reassign').checked = true;" %>
+<% end %>
+</p>
+</div>
+
+<%= submit_tag l(:button_apply) %>
+<%= link_to l(:button_cancel), :controller => 'wiki', :action => 'index', :id => @project, :page => @page.title %>
+<% end %>

app/views/wiki/edit.rhtml

@@ -1,4 +1,4 @@
-<h2><%= @page.pretty_title %></h2>
+<h2><%=h @page.pretty_title %></h2>
 
 <% form_for :content, @content, :url => {:action => 'edit', :page => @page.title}, :html => {:id => 'wiki_form'} do |f| %>
 <%= f.hidden_field :version %>