This blog is part of our Rails 6 series.
Before Rails 6, Rails was supporting PostgreSQL from version 9.1 and above. But in Rails 6, support for versions less than 9.3 is dropped. If your PostgreSQL version is less than 9.3 then an error is shown as follows.
1Your version of PostgreSQL (90224) is too old. Active Record supports PostgreSQL >= 9.3.