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https://github.com/jalkoby/squasher

Squasher - squash your old migrations in a single command
https://github.com/jalkoby/squasher

activerecord-migrations database ruby schema

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Squasher - squash your old migrations in a single command

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README 

        
# Squasher



[![CI](https://github.com/jalkoby/squasher/actions/workflows/ci.yml/badge.svg)](https://github.com/jalkoby/squasher/actions/workflows/ci.yml)

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[![Gem Version](https://badge.fury.io/rb/squasher.svg)](http://badge.fury.io/rb/squasher)



Squasher compresses old ActiveRecord migrations. If you work on a big project with lots of migrations, every `rake db:migrate` might take a few seconds, or creating of a new database might take a few minutes. That's because ActiveRecord loads all those migration files. Squasher removes all the migrations and creates a single migration with the final database state of the specified date (the new migration will look like a schema).



## Attention

Prior to 0.6.2 squasher could damage your real data as generate "force" tables. Please upgrade to 0.6.2+ & manually clean "force" tag from the init migration



## Installation



You don't have to add it into your Gemfile. Just a standalone installation:



    $ gem install squasher



**@note** if you use Rbenv don't forget to run `rbenv rehash`.



If you want to share it with your rails/sinatra/etc app add the below:



```ruby

# Yep, the missing group in most Gemfiles where all utilities should be!

group :tools do

  gem 'squasher', '>= 0.6.0'

  gem 'capistrano'

  gem 'rubocop'

end

```



Don't forget to run `bundle`.



To integrate `squasher` with your app even more do the below:



    $ bundle binstub squasher

    $ # and you have a runner inside the `bin` folder

    $ bin/squasher



## Usage



**@note** stop all preloading systems if there are present (spring, zeus, etc)



Suppose your application was created a few years ago. `%app_root%/db/migrate` folder looks like this:

```bash

2012...._first_migration.rb

2012...._another_migration.rb

# and a lot of other files

2013...._adding_model_foo.rb

# few years later

2016...._removing_model_foo.rb

# and so on

```



Storing these atomic changes over time is painful and useless. It's time to archive this history. Once you install the gem you can run the `squasher` command. For example, you want to compress all migrations which were created prior to the year 2017:



    $ squasher 2017        # rails 3 & 4

    $ squasher 2017 -m 5.0 # rails 5+



You can tell `squasher` a more detailed date, for example:



    $ squasher 2016/12    # prior to December 2016

    $ squasher 2016/12/19 # prior to 19 December 2016



### Options



Run `squasher -h` or just `squasher` to see how you can use squasher:



- in sql schema rails app

- in rails 5+ app

- inside an engine

- in "dry" mode

- in "reuse" mode



## Requirements



It works and was tested on Ruby 2.0+ and ActiveRecord 3.1+. It also requires a valid development configuration in `config/database.yml`.

If an old migration inserted data (created ActiveRecord model records) you will lose this code in the squashed migration, **BUT** `squasher` will ask you to leave a tmp database which will have all data that was inserted while migrating. Using this database you could add that data as another migration, or into `config/seed.rb` (the expected place for this stuff).



## Changelog



All changes are located in [the changelog file](CHANGELOG.md) with contribution notes



## Contributing



1. Fork it

2. Create your feature branch (`git checkout -b my-new-feature`)

3. Commit your changes (`git commit -am 'Add some feature'`)

4. Push to the branch (`git push origin my-new-feature`)

5. Create new Pull Request