Merge branch 'english'

* english:
  optimized navigation code and renamed folders
  A paragraph about Sequel::Model.raise_on_typecast_failure
  Add a link back to the full Sequel plugins list.

app/helpers/global_helpers.rb

@@ -24,10 +24,10 @@ def rtl_support_class
     def page_nav_links(format = 'markdown')
       return if params[:action] != 'show' || @page.nil? # Don't need navigation for the TOC (index).
       links = []
-      links << previous_page_url
+      links << previous_page_url unless @page.previous_file.include?('table-of-contents')
       # Stick a link to the TOC in the middle of the array.
       links << link_to(language_text(language, 'Home'), url(:toc, :language => language))
-      links << next_page_url
+      links << next_page_url unless @page.next_file.include?('table-of-contents')
       links.join(' | ')
     end
 

app/models/page.rb

@@ -38,7 +38,7 @@ def next_file
     return @next_file unless @next_file.nil?
     n_file = Dir["#{Merb.root}/book-content/#{language}/#{chapter_number}-*/#{page_number + 1}-*.*"].entries.first
     if n_file.nil?
-      n_file = Dir["#{Merb.root}/book-content/#{language}/#{chapter_number + 1}-*/**"].entries.first
+      n_file = Dir["#{Merb.root}/book-content/#{language}/#{chapter_number + 1}-*/toc.*"].entries.first
       # We're on the last page of the last chapter, just return the TOC.
       n_file =  "#{Merb.root}/book-content/#{language}/table-of-contents" if n_file.nil? 
     end
@@ -61,7 +61,8 @@ def previous_file
     return @previous_file unless @previous_file.nil?
     p_file = Dir["#{Merb.root}/book-content/#{language}/#{chapter_number}-*/#{page_number - 1}-*.*"].entries.first
     if p_file.nil?
-      p_file = Dir["#{Merb.root}/book-content/#{language}/#{chapter_number - 1}-*/**"].entries.last
+      p_file = Dir["#{Merb.root}/book-content/#{language}/#{chapter_number - 1}-*/[0-9]*?*.*"].entries.last
+      p_file = Dir["#{Merb.root}/book-content/#{language}/#{chapter_number - 1}-*/toc.*"].entries.first if p_file.nil?
       # We're on the last page of the last chapter, just return the TOC.
       p_file =  "#{Merb.root}/book-content/#{language}/table-of-contents" if p_file.nil? 
     end
@@ -91,8 +92,8 @@ def find_page_file
     end
 
     def extract_chapter_and_page_number
-      file =~ /book-content\/\w{2}\/(\d{1,})-[a-z-]+\/(\d{1,})-[a-z-]+[.]\w+/
-      @chapter_number, @page_number = $1.to_i, $2.to_i
+      file =~ /book-content\/\w{2}\/(\d{1,})-[a-z-]+\/((\d{1,})-[a-z-]+|toc)[.]\w+/
+      @chapter_number, @page_number = $1.to_i, $3.to_i
     end
 
     def extract_next_chapter_and_page_name
@@ -105,8 +106,8 @@ def extract_previous_chapter_and_page_name
 
     # Returns an array with the chapter name and the page name of the file to process
     def extract_chapter_and_page_number_for_file(file_to_process)
-        file_to_process.grep(/book-content\/\w{2}\/\d{1,}-([a-z-]+)\/\d{1,}-([a-z-]+)[.]\w+/)
-        [$1, $2]
+        file_to_process.grep(/book-content\/\w{2}\/\d{1,}-([a-z-]+)\/(\d{1,}-([a-z-]+)|(toc))[.]\w+/)
+        [$1, $3]
     end
 
 end

book-content/en/5-interacting-with-the-database-sequel/5-model-validation.markdown

@@ -48,7 +48,18 @@ If validation fails, errors can be accessed on the object with the `#errors` met
     => 'is too short'
 {:lang=ruby html_use_syntax=true}
 
-
+By default, Sequel will also not allow unexpected data into a column.
+If the table schema prevents a column from containing a nil value, it can not be set to nil.
+Sequel attempts to typecast entered values to match their column type.
+This can be disabled by setting the class attr\_accesor `raise_on_typecast_failure` to false.
+
+    a => Address.new(:user_id => 1, :city => 'A City')
+    a.user_id = nil
+    Sequel::Error::InvalidValue: nil/NULL is not allowed for the user_id column
+    Address.raise_on_typecast_failure = false
+    a.user_id = nil
+    => nil
+
 A full set of documentation for model validations can be found in the [Merb::Sequel documentation][]
 
 

book-content/en/5-interacting-with-the-database-sequel/6-sequel-plugins.markdown

@@ -5,6 +5,8 @@ Sequel Plugins are libraries packaged as gems which can add useful functionality
 Plugins are named like `sequel_pluginname`.
 They're used in models by declaring `is :pluginname`.
 Plugins for Sequel are painless to use, and are easy to write.
+These are just a few examples.
+Jeremy Evans maintains a more [complete list of plugins][].
 
 
 ##Useful Plugins
@@ -79,6 +81,8 @@ There is, however, a migration included in the plugin source.
 Sequel\_taggable depends on the sequel\_polymophic plugin.
 Here's the [sequel\_taggable source][].
 
+[complete list of plugins]:   http://sequel.rubyforge.org/plugins.html
+
 [sequel_timestamped source]:    http://github.com/bricooke/sequel_timestamped/tree/master
 
 [sequel_notnaughty source]:     http://github.com/boof/sequel_notnaughty/tree/master
@@ -87,4 +91,4 @@ Here's the [sequel\_taggable source][].
 
 [sequel_polymorphic source]:    http://github.com/jackdempsey/sequel_polymorphic/tree/master
 
-[sequel_taggable source]: http://github.com/jackdempsey/sequel_taggable/tree/master
+[sequel_taggable source]: http://github.com/jackdempsey/sequel_taggable/tree/master