Replace sqlite t & f boolean fields with 1 & 0 in one shot. Fixes config.active_record.sqlite3.represent_boolean_as_integer for older db's.

config.active_record.sqlite3.represent_boolean_as_integer.txt

Rails.application.eager_load!
ApplicationRecord.descendants.each do |klass|
klass.columns.select{ |c| c.type == :boolean }.map(&:name).each do |bool_column|
klass.where("#{bool_column} = 't'").update_all(bool_column.to_sym => 1)
klass.where("#{bool_column} = 'f'").update_all(bool_column.to_sym => 0)
end
end