Subtyping Unleased!
Speaker: Rocky Burt

Who I Am
Rocky Burt
ServerZen Software
http://www.serverzen.com
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Subtyping?
 Narrow classification
 Functionality hook
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Why Subtype?
 Many possible faces for an
existing content type
 Simple conversion
 Delayed specification
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Use Cases
 Need different content identity
depending on situation
 Need some way to transform
identity based on event reaction
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p4a.subtyper
 Minimal framework
 Hooks up subtypes into content
menu
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An Example:
Setting up p4a.subtyper
easy_install p4a.subtyper
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An Example:
Creating New Package
p4a.subtyperdemo
Example source at:
http://www.plone4artists.org
/svn/projects/p4a.subtyperdemo/
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An Example:
Sub-type Marker Interface
 New module named interfaces
 New interface named IUltraDoc
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An Example:
Sub-type Marker Interface
class IUltraDoc(interface.Interface):
\"\"\"A new ultra document subtype.\"\"\"
interface.alsoProvides(IUltraDoc,
IContentType)
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An Example:
Sub-type Descriptor
 New module named
descriptors
 New descriptor named
UltraDocDescriptor
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An Example:
Sub-type Descriptor
class UltraDocDescriptor(object):
implements(IPortalTypedDescriptor)
title = u'Ultra Doc'
description = u'New ultra style '\\
u'document.'
type_interface = IUltraDoc
for_portal_type = 'Document
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An Example:
New View
 New template called ultradoc.pt
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An Example:
New View
<div metal:fill-slot=\"main\">
<h2>This is an ultradoc!</h2>
<h3 tal:content=\"context/Title\"></h3>
<p
tal:content=\"context/Description\"></p>
</div>
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An Example:
Tying Together – ZCML
 Register descriptor as utility
 Hook new view up applying to
marker interface
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An Example:
Tying Together – ZCML
<utility
name=\"ultradoc\"
factory=\".descriptors.UltraDocDescriptor\"
/>
<browser:page
for=\".interfaces.IUltraDoc\"
name=\"document_view\"
permission=\"zope2.View\"
template=\"ultradoc.pt\"
/>
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An Example:
Before
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An Example:
After
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An Example:
Regular Content
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Other Features
 Special subtype events
 Extension by adapters and
schema's
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Conclusion
Questions?
Comments?
Resources at:
http://www.serverzen.com
/training/subtyping-unleashed
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