试图创建一个脚手架，但迁移已存在于Rails中

Question

I tried to create a new scaffold called Message and got this error message:

Another migration is already named create_messages

What can I do aside from changing the name of my model/controller/views (which I don't want to do)?

The reason this is occurring is I had a previous scaffold called Message that I changed to a different name (ran a migration to do this along with a search and replace for all filenames and variable/class names). I understand why I get this error message, just want to know how to move forward.

Answer 1

Quick fix is to rename old migration ( create_messages ) and try to generate scaffold again.

But recommendation is to have single create_messages migration so that it can be safely deleted by destroy scaffold command.

Update:

If already have Message model then no point in generating Message Scaffold, since scaffold does the same thing again with additional works like generating controller, routes etc.

Answer 2

If you already have a migration called create_messages you probably already have a Message model(Which means you can't have another named the same). If you have now decided you want to have a scaffold on the model to get the extra controller and view code use the following where name is the name of the column.

rails g scaffold Message name --skip