I store the schema as SQL instead of the .rb file nightmare. Here's the script to do it quickly with Postgres & bypass the Rake slowness:

    #!/bin/bash

    root="/path/to/your/code"
    user='postgres'
    db='dev'
    schema="$root/db/schema.sql"

    pg_dump -U $user $db \
      --schema=public \
      --schema-only \
      --no-owner \
      --no-privileges \
      --file $schema

    pg_dump -U $user $db \
      --table public.schema_migrations \
      --no-owner \
      --data-only \
      --insert \
      >> $schema

Then a trivial `dropdb`, `createdb`, `psql < db/schema.sql`

And then a small script with 4 or 5 curl calls can get enough data into the database to drive some tests.