How to solve “Cannot add a NOT NULL column with default value NULL” in SQLite3?

Question

I am getting the following error while trying to add a NOT NULL column to an existing table. Why is it happening ?. I tried rake db:reset thinking that the existing records

Answer 1

The following migration worked for me in Rails 6:

class AddDivisionToProfile < ActiveRecord::Migration[6.0]
  def change
    add_reference :profiles, :division, foreign_key: true
    change_column_null :profiles, :division_id, false
  end
end

Note :division in the first line and :division_id in the second

API Doc for change_column_null