rails g model Rating user_id:integer message:string value:integer
How can I completely remove this model? Thanks
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6Mikhail's top answer below applies to a model created in the last migration. Those who want to remove a model and its table that have been around for a while, this thread describes exactly what to do.– NinjakannonMar 4, 2014 at 0:11
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6 Answers
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>
answered Aug 18, 2011 at 10:35
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:( Read the first line and did it. It was my fault, but a correctly-ordered answer may have helped.– Mike TJul 22, 2013 at 19:40
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4if it's development and you don't afraid to lose your data you can run
bundle exec rake db:drop db:create db:migrate. It will be a new empty database. Jul 22, 2013 at 20:30 -
Ye thanks. I restored the migration from the Trash but it turns out I had another missing migration too so I'm going to do what you suggest– Mike TJul 23, 2013 at 7:03
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6@MikeT You what? Restored the migration from the trash? You don't use any VCS? o_O You absolutely should! Sep 6, 2015 at 18:06
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Worked for me, but I also had to go into routes.rb and delete " devise_for :MODEL" Aug 28, 2018 at 18:13
Try this
rails destroy model Rating
It will remove model, migration, tests and fixtures
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6It removes all, but it do not create downgrade migration or something.– mr.TheFeb 12, 2014 at 18:10
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 versionTo remove Model
rails d model name #name => Your model name
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1
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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This is a useful answer - but the command doesn't work for me. I used: bundle exec rails generate migration DropEpisodes And then I would also use model deletion code below as well. Feb 13, 2020 at 13:23
If you are interested in reversible migration to drop a table
class DropProductsTable < ActiveRecord::Migration[7.0]
def change
drop_table :products do |t|
t.string :name
t.text :description
t.decimal :price, precision: 8, scale: 2
t.timestamps
# Rest of the stuff like indexes. Consider copying directly from schema.rb
end
end
end
