DatabaseRepository

Welcome to the DatabaseRepository gem! This gem was written to provide an extra layer to your Ruby applications called repositories. Repositories are used to interact with our database - execute all queries. Thanks to them, you don't need to write anymore ActiveRecord code inside your models, controllers, and services - everything is much simpler to maintain!

This gem requires just ActiveRecord, not Rails - feel free to use it without Rails in your Rack applications!

Installation

Add this line to your application's Gemfile:

gem 'database_repository'

And then execute:

$ bundle

Or install it yourself as:

$ gem install database_repository

How to create a repository

To create a new repository, you just need to run a Rails generator (if you use Rails):

$ rails generate database_repository:repository your_repository_name

For example:

$ rails generate database_repository:repository user

A new repository will be generated under:

• app/repositories/user_repository.rb

You can also add the new repository to app/repositories, your class should inherit from DatabaseRepository::Base class, like:

class UserRepository < DatabaseRepository::Base
end

Dependencies

• ActiveRecord >= 3.2

Usage

If you want to use your repository, you should create a new instance of a repository, then call a method which will return some data:

users_repository = UserRepository.new
users = users_repository.all
user = users_repository.find(2)

By default, a repository maps to a model by a repository's name, for example:

• UserRepository -> User
• LineItemRepository -> LineItem
• User::LineItemRepository -> User::LineItem

If you want to change a model, you can redefine a class name:

class UsersRepository < DatabaseRepository::Base
  entity 'Model'
end

Preimplemented methods:

• all

calls ActiveRecord Model.all method.

• build(attributes)

calls ActiveRecord Model.new(attributes) method.

• find(id)

calls ActiveRecord Model.find(id) method. Raises DatabaseRepository::RecordNotFound if a record is not found.

• find_by(id)

calls ActiveRecord Model.find_by(id) method.

• find_or_initialize_by(id)

calls ActiveRecord Model.find_or_initialize_by(id) method.

• find_or_create_by(attributes)

calls ActiveRecord Model.find_or_create_by(attributes) method.

• find_or_create_by!(attributes)

calls ActiveRecord Model.find_or_create_by!(attributes) method. Raises DatabaseRepository::RecordInvalid if a record is invalid.

• first(limit = nil)

calls ActiveRecord Model.first(limit = nil) method.

• first!

calls ActiveRecord Model.first! method. Raises DatabaseRepository::RecordNotFound if a record is not found.

• last(limit = nil)

calls ActiveRecord Model.last(limit = nil) method.

• last!

calls ActiveRecord Model.last! method. Raises DatabaseRepository::RecordNotFound if a record is not found.

• create(attributes)

calls ActiveRecord Model.create(attributes) method.

• create!(attributes)

calls ActiveRecord Model.create!(attributes) method. Raises DatabaseRepository::RecordInvalid if a record is invalid.

• update(id, attributes)

calls ActiveRecord Model.update(id, attributes) method.

• update!(id, attributes)

calls ActiveRecord Model.update!(id, attributes) method. Raises DatabaseRepository::RecordInvalid if a record is invalid.

• update_all(attributes)

calls ActiveRecord Model.update_all(attributes) method.

• delete(id)

calls ActiveRecord Model.delete(id) method.

• destroy(id)

calls ActiveRecord Model.destoy(id) method.

• destroy!(id)

calls ActiveRecord Model.destroy!(id) method. Raises DatabaseRepository::RecordNotDestroyed if a record cannot be destroyed.

• delete_all

calls ActiveRecord Model.delete_all method.

• destroy_all

calls ActiveRecord Model.destroy_all method.

Your own methods

If you want to add your methods, just write a regular ActiveRecord code, for example:

class UserRepository < DatabaseRepository::Base
  def most_recent_by_name(name:, limit: 5)
    entity.where(name: name).
      order(created_at: :desc).
      limit(limit)
  end
end

Then, inside your service, controller or any other class:

UserRepository.new.most_recent_by_name(name: 'Piotr Jaworski', limit: 10)

Voila! That's all!

TODO

• Add Sequel support

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.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/piotrjaworski/database_repository. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

MIT License. Copyright 2018 Piotr Jaworski - http://piotrjaworski.pl.