Rails 4 JSON attribute type not working with Postgres

OK, so it turns out at one point I had installed postgres via homebrew, and had also done so with Postgres.app at a different time. I began to realize this by checking the version of 'psql' and 'postgres' and noticed the distinction.

psql --version
psql (PostgreSQL) 9.0.4

postgres --version
postgres (PostgreSQL) 9.2.4

I uninstalled Postgres.app using their documentation here and then using homebrew ensured I was using the most recent version of postgres.

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