rails tsearch plugin for postgresql 8.3
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NOTE && TODO:  This has been tested on Rails 2.0.2, 2.1.0 and 2.1.1 only.
It contains some activesupport'isms, and... they should definitely be
stripped out and this plugin made into a proper gem.

  This is an extremely light weight interface to postgresql 8.3's built
  in text searching.  There exists an acts_as_tsearch, but this is its
  smaller and built specifically for 8.3, more pointed, brother.
  It lacks many features, but is useful in most text searching scenerios.

  This plugin assumes a lot.  The lot is:
    - Default language used for full text search is english. Use :catalog => 'pg_catalog.french' to change that.
    - GIN index by default.  You can pass in :index => 'GIST' if you'd like to change that.
    - Default tsvector is a coellesced composite of the fields you pass in.
    - OPTIONAL: if you want to use suggestion feature ("do you mean x ?") pg_trgm has to be activated like this: 
		psql database_name < /path_to_your_pg_contrib_folder/pg_trgm.sql
		(see http://www.postgresql.org/docs/8.3/static/pgtrgm.html for more details about pg_trgm)

  - ensure your table has a tsvector ts_index column
    ... in create table block:  t.tsvector :ts_index

  - ensure your model declares text_searchable properly
    ... tsearchable :fields => [:name, :description]

  - create tsvector index and trigger using rake task
    ... rake tsearchable:vectors:create VECTOR=name_of_the_model
    ... rake tsearchable:triggers:create VECTOR=name_of_the_model

  - YourModel.find_by_text_search("moose OR mousse")
    ... returns result set.  supports most googlish ands and ors and double quoting
    ... supports WillPaginate pagination, and the will_paginate view helper

  - YourModel.count_by_text_search("moose OR mousse")
    ... returns the number of matches
  OPTIONAL: to use suggestion feature (pg_trgm MUST be activated)
  - ensure your table has a column with gist_trgm_ops or gin_trgm_ops index type
	... TODO: create rake task to do that
  - ensure your model declares suggestion fields
	... tsearchable :suggests => [ :title ]
  - YourModel.find_by_trgm("keyword")
	... returns result set.

most importantly... document, and turn it into a gem

- weighting, highlighting, 
- custom parsers/templates/rankers, 
- multiple vectors, 
- multitable support