This extension allows you to use Google Base to list products for free that will appear in Google Product Search (http://www.google.com/shopping).
For product feed field definitions, (consult http://support.google.com/merchants/bin/answer.py?hl=en&answer=188494#US)
Forked from github.com/jumph4x/spree-google-base, updated for Spree 2.0, removed taxon map and need to install migrations
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Create google base account. Create google base ftp account (if applicable). Create data feed in google base with a type "Products" and name "google_base.xml".
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Set preferences in spree admin panel (/admin/google_base_settings) for the feed title, public domain, feed description, ftp login and password. FTP login is not required - you may schedule upload from the public directory.
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Issue the command 'rake spree_google_base:generate_and_transfer' to generate feed. Verify feed exists (YOUR_APP_ROOT/public/google_base.xml).
You can modify fields set for export and list of 'g:' attributes. Look at config/initializers/google_base.rb You can override values of GOOGLE_BASE_ATTR_MAP and GOOGLE_BASE_FILTERED_ATTRS arrays with help of Array#delete, Array#delete_at, Array#<<, Array#+=, etc. Also you can override methods from product_decorator.rb in your site extension.
There are two options to regulate google base product update:
A) Setup cronjobs to run 'rake spree_google_base:generate' and 'rake spree_google_base:transfer'
Development of this extension is sponsored by End Point and by FCP Groton.