Removing a model in rails (reverse of “rails g model Title…”)

Question

rails g model Rating user_id:integer message:string value:integer

How can I completely remove this model? Thanks

Answer 1

When you generate a model, it creates a database migration. If you run 'destroy' on that model, it will delete the migration file, but not the database table. So before run

bundle exec rails db:rollback
rails destroy model <model_name>

For rails versions before 5.0 and higher use rake instead of rails

bundle exec rake db:rollback   
rails destroy model <model_name>

Answer 2

Try this

rails destroy model Rating

It will remove model, migration, tests and fixtures

Answer 3

For future questioners: If you can't drop the tables from the console, try to create a migration that drops the tables for you. You should create a migration and then in the file note tables you want dropped like this:

class DropTables < ActiveRecord::Migration
  def up
    drop_table :table_you_dont_want
  end

  def down
    raise ActiveRecord::IrreversibleMigration
  end
end

Answer 4

1. To remove migration (if you already migrated the migration)

    rake db:migrate:down VERSION="20130417185845" #Your migration version

2. To remove Model

   rails d model name #name => Your model name

Answer 5

Here's a different implementation of Jenny Lang's answer that works for Rails 5.

First create the migration file:

bundle exec be rails g migration DropEpisodes

Then populate the migration file as follows:

class DropEpisodes < ActiveRecord::Migration[5.1]
  def change
    drop_table :episodes
  end
end

Running rails db:migrate will drop the table. If you run rails db:rollback , Rails will throw a ActiveRecord::IrreversibleMigration error.