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added documentation on the polymorphic associations referential integrity pattern
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‎README.rdoc‎

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http://ryan.mcgeary.org/2011/02/09/vendor-everything-still-applies/
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== Importing data for development
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== Database
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We use PostgreSQL. Polymorphic associations are enhanced with this referential integrity pattern:
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http://blog.metaminded.com/2010/11/25/stable-polymorphic-foreign-key-relations-in-rails-with-postgresql/
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(hard copy in doc)
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=== Importing data for development
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FILE=lib/assets/files/20_animal_species.csv rake import:species
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== Taxonomic glossaries

‎doc/Stable polymorphic foreign key relations in Rails with PostgreSQL |.html‎

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‎doc/Stable polymorphic foreign key relations in Rails with PostgreSQL |_files/blog-new.png‎

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‎doc/Stable polymorphic foreign key relations in Rails with PostgreSQL |_files/shCoreDefault.css‎

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/**
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* SyntaxHighlighter
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* http://alexgorbatchev.com/SyntaxHighlighter
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* SyntaxHighlighter is donationware. If you are using it, please donate.
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* http://alexgorbatchev.com/SyntaxHighlighter/donate.html
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* 3.0.83 (July 02 2010)
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* Copyright (C) 2004-2010 Alex Gorbatchev.
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*
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* Dual licensed under the MIT and GPL licenses.
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*/
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‎doc/Stable polymorphic foreign key relations in Rails with PostgreSQL |_files/simple-social-sharing.css‎

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