# Rails4InvalidForeignKeyMigrationChecker

When there are 'users'table and 'posts' table exist and execute add_foreignkey(:posts, :user).

`remove_foreign_key :users, :posts` is correct migration. 
`remove_foreign_key :users, :post` is invalid migration but rails 4 not raise error and rails 5 raise error.
So if you upgrade rails 4 to 5, your migration fail.

This gem check this invalid migration and raise error.

## Installation

Add this line to your application's Gemfile:

```ruby
gem 'rails_4_invalid_foreign_key_migration_checker'
```

And then execute:

    $ bundle

Or install it yourself as:

    $ gem install rails_4_invalid_foreign_key_migration_checker

## Usage

    $  RAILS_ENV=test bundle exec rake db:drop db:create db:migrate
    
If any migration isn't correct, it will be failed.
(This gem work only RAILS_ENV=test)

## Development

After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).

## Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/rails_4_invalid_foreign_key_migration_checker. 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).

## Code of Conduct

Everyone interacting in the Rails4InvalidForeignKeyMigrationChecker project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the [code of conduct](https://github.com/[USERNAME]/rails_4_invalid_foreign_key_migration_checker/blob/master/CODE_OF_CONDUCT.md).