Rails remove old models with migrations

I have a bunch of rails models that I'm re-writing into a single model to simplify my code and reduce unnecessary tables.

I'm wondering what the best way to delete a model class and its table is. I want past migrations to still succeed, but I don't want to leave the empty models lying around.

Do I have to 开发者_C百科manually delete the old migrations that reference these models, then manually delete the class files?

Does anyone have any tips for the best way to do this?

All in one solution.

Run the following commands:

rails destroy model ModelName
rails g migration DropTableModelName

The former will generate a new migration file which should looks like this:

class DropTableModelName < ActiveRecord::Migration
  def change
    drop_table :model_name
  end
end

Now run db:migrate and you're done.

If you'd like to completely get rid of of a model and its table do this:

rails destroy model Name

The question is a bit stale now, but I just did:

rails destroy scaffold <ModelName> -p

The -p flag shows "pretend" output, which is good for seeing what will happen. Remove the '-p' flag and the results will match the output. This cleaned the entire collection of M-V-C files + testing + js files + the original migration, no problem.

I guess if you are one who likes to hand edit your migrations and include multiple steps in each, losing the original migration could break db:setup, so buyer beware. Keeping one action == one migration file should avoid this potential snafu.

What about doing ruby script/destroy model? That should take care of the model and the migration.

Depending on how far into development or production you are, you may want to migrate the models out safely using a migration to remove/backup data or what not. Then as bobbywilson0 suggested, using

script/destroy model

or if you rspec anything

script/destroy rspec_model

This will remove any spec tests as well.

Or you can always just drag them to the trash folder.

You can take a look at this one at rails guide. But I suggest, if it is possible, you should delete the models and all references to the models. This will probably save time later as you don't need to maintain the dead code in the codebase.

If you'd rather have a manual based answer:

First run the following command to identify which migrations you want removed:

rake db:migrate:status

Feel free to grep -i on it too if you're confident of your naming scheme.

Make note of all the "add x to model name" and similar alterations to your Model. These can be removed using:

rails d migration AddXToModelName

Do this for every migration besides the initial create migration. The following command will take care of the initial create migration and the files associated with the model:

rails d model ModelName