= Migration

Nitro and Og are under constant development. Some times we 
really have to introduce features that break the compatibility 
with older versions. This documents describes the required 
steps to port your application to the latest Nitro version.

For more help, send your question to the mailing list:

http://rubyforge.org/mailman/listinfo/nitro-general


== 0.40.0 <- 0.31.0

This version was in the making for ages, so there are some changes
you need to make to port your application to the new version. Here 
come some tips to help you:

- Prefer to use 

  $ nitro

  instead of 

  $ ruby run.rb

  to start your application.

- The 'Markup' compiler is renamed to 'MarkupCompiler' 

- Use attr_accessor instead of property or prop_accessor.

- Prefer to define elements like this:

  class Nitro::Element
    class MyElement
    ..
    end
  end

  instead of

  class MyElement < Nitro::Element
  end

- Change
  
  def my_action
    ..
  end
  ann :my_action, :view => :another_template
  
  to
  
  ann :my_action, :template => :another_template
  
  
== 0.29.0 <- 0.28.0

1. Please notice that Tag now resides in the Glue namespace, you 
   will probably have to update your tables.
   
2. You have to be more careful with the hrefs you pass to
   <render > and <?include ?>. Some times you have to pass
   absolute paths (ie /this/is/my path) to get the correct
   behaviour. Nitro is more strict in this version.
   
3. The routing rule format has changed slightly.


== 0.27.0 <- 0.26.0

1. If you use a custom compiler pipeline, notice that the interface
has changes slightly:

  def transform_template(template)
    template = StaticInclude.transform(template)
    template = Morphing.transform(template, self)
#   template = LayoutCompiler.transform(template, self)
    template = Elements.transform(template, self)
    template = Markup.transform(template)
    template = ScriptCompiler.transform(template, self)
    template = Cleanup.transform(template)
    template = Template.transform(template)
  end

you need to pass 'self' for some compilers.

2. The helper script 'nitrogen' is removed. Use gen instead

3. There is a new system for prototype/scriptaculous integration.
Have a look at the flickr example for more details.


== 0.21.2 <- 0.21.0

1. The new 'nice' dispatching alogirthm is enabled by default. If
your app needs more general url dispatching you can enable the
old dispatcher with the following line:

require 'nitro/dispatcher/general'


== 0.21.0 <- 0.20.0

1. The helper methods for starting the application and defining
the compilation pipeline have changed. Have a look at 
'examples/blog/run.rb' for an example.

2. The conventions for the generated join table for many_to_many
have changed, you may have to regenerate your schema.

3. The builder functionality is provided by mixins now.

4. The markup interpolators have changed. Instead of {{..}} use
#(..) (sanitize) or #|..| (full markup). For details have a look
at lib/nitro/compiler/markup.rb

5. Actions no longer automatically redirect to the referer if the
output buffer is empty. You have to manually redirect. There is an option to switch on the old behaviour though.