Check DB Version -- place this in config in your Rails app to ensure the team uses the same db version. Change line to match your expected DB.

check_db_version.rb

# Method to check the DB version matches
# We ran into an issue where different versions of postgres caused inconsistent results.
def check_db_version
  expected_db_version = "PostgreSQL 9.4"
  adapter = ActiveRecord::Base.connection.adapter_name
  sql = case adapter
        when "MSSQL"
          "SELECT @@VERSION"
        when "MySQL", "Mysql2", "PostgreSQL"
          "SELECT VERSION()"
        when "OracleEnhanced"
          "SELECT * FROM V$VERSION"
        when "SQLite"
          "SELECT SQLITE_VERSION()"
        end
  db_version = ActiveRecord::Base.connection.select_value(sql)

  unless db_version.index(expected_db_version)
    puts "X" * 80
    puts "Invalid DB version. Please use #{expected_db_version}, found #{db_version}"
    puts "X" * 80
  end
end

check_db_version