Straight from rails4.0 documentation:
http://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html
Creating an index with a specific method
add_index(:developers, :name, using: 'btree')
generates:
CREATE INDEX index_developers_on_name ON developers USING btree (name) --
PostgreSQLCREATE INDEX index_developers_on_name USING btree ON developers
(name) -- MySQL
Note: only supported by PostgreSQL and MySQL
On Tuesday, July 2, 2013 1:13:15 PM UTC-4, Linus Pettersson wrote:
>
> Hi
>
> I'm sorting some columns like this: MyModel.order("LOWER(column) ASC")...
> But these queries are quite slow. I'm on Postgres by the way.
>
> Does Rails support creating a lowercase index for these situations? I know
> Postgres has support for it and I guess I can create one like this (found
> on SO):
>
> execute "CREATE UNIQUE INDEX index_products_on_lower_name ON products USING
> btree (lower(name));"
>
> But does Rails have support for creating it? Don't like to use execute()
> if there is a better way :)
>
> Cheers,
> Linus
>
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