science to bfg

Migrating a public NASA site to Repoze BFG

Chris Shentonkoansys.com

Talk Overview

• Science@NASA

• Repoze BFG

• S@N in BFG

science@nasa

• science.nasa.gov

• 13 years of stories

• 1.8 million visits/month

• manually maintained

• varying HTML formats over time

• no built-in search

s@n varying html

• 2009

s@n varying html

• 2003

s@n varying html

• 1996

CMS Wanted

• Folders, Pages

• Files, Images

• Search

• TTW Editor

• Permissions per object

Existing Plone Site

• nasascience.nasa.gov

• too complex

New Plone Site?

• Plone3’s become painful :-(

Repoze BFG?

• Same Zope Object Database

• Similar ZPT Templates

• Same Catalog index, search

• Tiny

• Fast

• Easy to learn

Repoze BFG• http://bfg.repoze.org/

• “Zope with the serial numbers filed off”

• Chris McDonough’s 4th implementation

• 100% test coverage

• Excellent, complete documenation

• Good fit for CMS-shaped data

• ZODB

• Traversal

ZODB

• Persistent object store

• Python objects

• Dictionaries, attributes

• children = page.items()

• parent = page.__parent__

ZODB forlightly structured data

sangria

recipes

Spanish seafood

paella grouper squid

on bbq cava red

ZODB: flexible

sangria

recipes

Spanish seafood

paella grouper squid

on bbq cava red

photo tastingnotes

Traversal: the way we think

sangria

recipes

Spanish seafood

paella grouper squid

on bbq cava red

/recipes/Spanish/sangria/cava/recipes/seafood/squid

TraversalWe don’t need no stinking ORM

Models: just Python

• Folderish Page

Models: just Python

• File

• Image

• subclass

• blobs

Views: fill templates

View: add, edit

TemplatesChameleon: ZPT on steroids

• ZPT, TAL, METAL

• http://chameleon.repoze.org/docs/zpt/

• http://www.zope.org/Documentation/Books/ZopeBook/2_6Edition/ZPT.stx

• http://wiki.zope.org/ZPT/TALSpecification14

Templates: O-wrap

• define-slot

Templates: page view

• fill-slot

Catalog: index

• define indices

Catalog: search

• view

Import science@nasa

• wget site

• import html

• use xpaths

But will it blend?

• Live demo!