Ctrl+Z in Rails 5: Undo Tables, Models, and Controllers.
From Model Operations View select the Manage Attributes operation. From the Settings section, select the Remove Attribute option. From the dropdown list select the attribute that has to be removed (or select the Remove All check-box, if you need to remove all the attributes from the class). Click on the Execute button.
A Rails Model is a Ruby class that can add database records (think of whole rows in an Excel table), find particular data you're looking for, update that data, or remove data. These common operations are referred to by the acronym CRUD--Create, Remove, Update, Destroy.
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>
Try this
rails destroy model Rating
It will remove model, migration, tests and fixtures
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
To remove migration (if you already migrated the migration)
rake db:migrate:down VERSION="20130417185845" #Your migration version
To remove Model
rails d model name #name => Your model name
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.
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