What are the reasons why the migration fails?

Question

Ruby on Rails

I created a model,
I am running a migration
, what could be the reason that the migration is not suitable?
I checked the latest version of the migration - it says that it passed
but the data cannot be written down
, I attach everything in screenshots

Answer 1

On the first screen, everything is OK, what you programmed is what you got. If you changed something in the migration file, then you need to rollback the migration back db:rollback and then apply it again. Or even start from scratch: db:drop + db:create + db:migrate

Answer 2

Answer 3

And why did you decide that the migration does not work? You just have a deprecation warning. As far as I know, if you want to manually bring the test database schema into line with the development schema, you need to use the rake db:test:prepare command.

Answer 4

Judging by the screenshot in the question and the screenshot from the diagrams, you created a model and immediately migrated. Only then did they write code to it.
vsuhachev gave a suitable solution