Subtyping Unleased!Speaker: Rocky Burt

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Who I Am

Rocky BurtServerZen 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