https://github.com/twilightcoders/deleted_at
Provides functionality to ActiveRecord::Base to delete records while keeping them in the database.
https://github.com/twilightcoders/deleted_at
activerecord postgresql scopes views
Last synced: about 1 month ago
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Provides functionality to ActiveRecord::Base to delete records while keeping them in the database.
- Host: GitHub
- URL: https://github.com/twilightcoders/deleted_at
- Owner: TwilightCoders
- License: mit
- Created: 2014-08-27T04:25:49.000Z (almost 11 years ago)
- Default Branch: develop
- Last Pushed: 2019-12-24T01:05:15.000Z (over 5 years ago)
- Last Synced: 2024-10-30T20:53:21.491Z (8 months ago)
- Topics: activerecord, postgresql, scopes, views
- Language: Ruby
- Size: 104 KB
- Stars: 4
- Watchers: 2
- Forks: 1
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
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# DeletedAt
Hide your "deleted" data (unless specifically asked for) [without resorting to](https://stackoverflow.com/a/25087337/1454158) `default_scope` by leveraging in-line sub-selects. (See the [Upgrading](#upgrading) section)
## Requirements
- Ruby 2.3+
- ActiveRecord 4.1+
## Installation
Add this line to your application's Gemfile:
```ruby
gem 'deleted_at'
```
And then execute:
$ bundle
Or install it yourself as:
$ gem install deleted_at
## Usage
Invoking `with_deleted_at` sets the class up to use the `deleted_at` functionality.
```ruby
class User < ActiveRecord::Base
with_deleted_at
# the rest of your model code...
end
```
To work properly, the tables that back these models must have a `deleted_at` timestamp column.
```ruby
class AddDeletedAtColumnToUsers < ActiveRecord::Migration
def change
add_column :users, :deleted_at, 'timestamp with time zone'
end
end
```
If you're starting with a brand-new table, the existing `timestamps` DSL has been extended to accept `deleted_at: true` as an option, for convenience. Or you can do it seperately as shown above.
```ruby
class CreatCommentsTable < ActiveRecord::Migration
def change
create_table :comments do |t|
# ...
# to the `timestamps` DSL
t.timestamps null: false, deleted_at: true
end
end
end
```
## Performance
It's recommended (if your database engine supports it) to add partial indexes to the `deleted_at` columns. Remember that indexes work best when they represent a minority of the rows. It's up to you to determine the best index for your table.
Example 1:
You have a thriving business and your customers love your product and _rarely_ delete their account. You're likely to have way fewer rows `WHERE deleted_at IS NOT NULL`.
```ruby
class IndexDeletedAtColumns < ActiveRecord::Migration
def change
add_index :users, :deleted_at, where: "deleted_at IS NOT NULL"
end
end
```
Example 2:
You use expiring OAuth2 tokens as part of your application's authentication process. As time grows without bound rows `WHERE deleted_at IS NULL` will pale in comparison.
```ruby
class IndexDeletedAtColumns < ActiveRecord::Migration
def change
add_index :oauth_tokens, :deleted_at, where: "deleted_at IS NULL"
end
end
```
## [Upgrading](#upgrading)
If you've used `deleted_at` prior to v0.5.0, you'll need to migrate your schema. The new version of `deleted_at` no longer uses views, instead constructing a subselect on the relations. This significantly reduces code polution and monkey patching, as well as reducing the runtime memory usage for rails. Your Database will look (and be) a lot cleaner with no `deleted_at` views and your ERDs will be much cleaner as well.
Here is an example of a migration for upgrading
```ruby
require 'deleted_at/legacy'
DeletedAt.disable
class UpgradeDeletedAt < ActiveRecord::Migration
def up
# hip hip hooray!
models.each do |model|
DeletedAt::Legacy.uninstall(model)
end
end
def down
# booo hiss
models.each do |model|
DeletedAt::Legacy.install(model)
end
end
private
def models
[
User,
Post
]
end
end
```
## Development
After checking out the repo, run `bundle` to install dependencies. Then, run `bundle exec rspec` to run the tests.
## Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/TwilightCoders/deleted_at. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.
## License
The gem is available as open source under the terms of the [MIT License](http://opensource.org/licenses/MIT).