class ActiveRecord::DatabaseConfigurations::ConnectionUrlResolver

# => {}
"localhost"

returns empty hash if no query present.

# => { pool: "5", reaping_frequency: "2" }
"localhost?pool=5&reaping_frequency=2"

Converts the query parameters of the URI into a hash.

def query_hash
  Hash[(@query || "").split("&").map { |pair| pair.split("=", 2) }].symbolize_keys
end