Migrating a Product to Plone 4.0

Setup your buildout

Soon: add Plone==4.0a1 to the eggs in your buildout.cfg

Now: add your egg to the development buildout: http://tr.im/TryPlone4

Example buildout.cfg for Products.Poi

[buildout]
extends = buildout.cfg
auto-checkout +=
    Products.Poi
    Products.AddRemoveWidget
    Products.DataGridField

[sources]
Products.Poi = svn https://svn.plone.org/svn/collective/Products.Poi/trunk
Products.AddRemoveWidget = svn https://svn.plone.org/svn/archetypes/Products.AddRemoveWidget/trunk
Products.DataGridField = svn https://svn.plone.org/svn/archetypes/Products.DataGridField/trunk

[instance]
eggs +=
    Products.Poi

Things to test

• Does bin/buildout work?
• Does the instance start up in the foreground?
• Can you install your product?
• Can you create/view your content type?
• Do the tests pass?

What to change

http://plone.org/documentation/migration

BACKWARDS_COMPATIBILITY.txt in Plone package:

http://tr.im/backwards

Highlights

• Python2.6, Zope 2.12, CMF 2.2
• No more global_defines.pt

Poi Example 1

ImportError: No module named Interface

• Remove any imports of the Interface package.
• Remove any __implements__ lines from your content types.
• http://dev.plone.org/collective/changeset/100276

Poi Example 2

ImportError: No module named GlobalTranslationService

• use zope.i18n

Old:

from Products.PageTemplates.GlobalTranslationService \
    import getGlobalTranslationService 
ts = getGlobalTranslationService() 
msg = ts.translate('Poi', msg, context=self.context)

New:

from zope.i18n import translate 
msg = translate(msg, 'Poi', context=self.request) 

• http://dev.plone.org/collective/changeset/100277

[Update: you need to pass the request instead of the context.]

Plone 3.x and 4?

Compatibility can work:

try:
    from beer import Grolsch
except ImportError:
    # BBB
    from beer import Heineken

or maybe not:

install_requires=[
    'Plone>=4.0dev',
],