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Updated Building indexes (markdown)
Colorize ruby code examples
add link to blog post about multi-column indexes https://github.com/Casecommons/pg_search/issues/475
A typo? Operator class pg_trgm_ops does not exist. It should say: "gist_trgm_ops"
Add note about index having to match all the fields at pg_search_scope
Update the example pg_search_documents index to show the example for trigram indexes
Add docs on migration to generate index for pg_search_documents
Formatting to clarify are 2 alternative options.
Added hint to check EXPLAIN
Added instructions for adding to search specification.
Added more efficient way to update existing records.
tsvector_update_trigger returns a trigger which must be used directly in a create trigger sql statement. Since hair_trigger wraps the trigger code in it's own function this doesn't work. A custom tsv update trigger can be used however, the simplest of which I believe is the one now listed here. For more information: http://stackoverflow.com/questions/21147893/tsvector-update-trigger-cant-find-tsvector-column/21156826#21156826 . Also clarify what exactly you're adding the index to.
Change 'you need enough columns for the index to be used' to 'rows'
Added `new.tsv := ` in the manual trigger
Fix formatting.
Add instructions for Rails
Write a rough stub article. It needs work!