Error while first rake db:migrate

[zyle87]

I got an error on the first rake db:migrate

Directly inheriting from ActiveRecord::Migration is not supported. Please specify the Rails release the migration was written for:

  class CreateParaComponents < ActiveRecord::Migration[4.2]

[vala]

Is this for Rails 5.1 ?
Since we need to support 4.2 apps, can we just append the version in all our migration files ?

[zyle87]

You saw right, it was a 5.1 rails project, I gave a shot on a 4.2 rails project and I got this
NoMethodError: undefined method '[]' for #<ActiveRecord::Migration:0x007fcbc295a480>