SnFoil

SnFoil has been broken into smaller modules. This gem serves to combine the most common gems in the SnFoil family and add some additional CRUD behavior.

This gem only uses contexts, policies, and searchers but you can check out all our modules here:

• Contexts - Pipelined Business Logic
• Controllers - Separate HTTP Logic
• Policies - Authorization Checks
• Rails - Ruby on Rails Fluff
• Searchers - Intuitive Search Classes

Add this line to your application's Gemfile:

gem 'snfoil'

There is where the magic of the original gem started. The idea was to make a pipleline of logic that you could "plug" into certain intervals at. You can find the full documentation for contexts here.

SnFoil adds six CRUD-centeric contexts prewired to get you off the ground as fast as possible. Each context sets up intervals for you, and generally follow the same pattern for calls: setup, setup_<action>, before_<action>, after_<action>_success, after_<action>_failure, and after_<action>. You can find more information about each by clicking their respective links.

• SnFoil::CRUD::BuildContext - for setting up an object.
• SnFoil::CRUD::CreateContext - for setting up and saving an object to a data source.
• SnFoil::CRUD::DestroyContext - find and destroy an object
• SnFoil::CRUD::IndexContext - query for objects
• SnFoil::CRUD::ShowContext - find an object
• SnFoil::CRUD::UpdateContext find and update an object

You can pick and choose which features you want to use by including the specific file

require 'snfoil/crud/index_context'
require 'snfoil/crud/show_context'

class PeopleContext
  include SnFoil::CRUD::IndexContext
  include SnFoil::CRUD::ShowContext

  # hooks and methods here
end

Or you can add all them in one go with SnFoil::CRUD::Context.

require 'snfoil/crud/context'

class PeopleContext
  include SnFoil::CRUD::Context

  # hooks and methods here
end

Each of the CRUD contexts allows a Searcher, Policy, and Model to be added to the class. These are there so each function of the CRUD context can proceed without a lot of bootstrap code.

Any time a model is fetched, that process goes through a searcher. This ensures that authorization logic is always followed - lowering the likelyhood of entity/user getting access to a model they shouldn't

class PeopleContext
  include SnFoil::CRUD::Context

  searcher PeopleSearcher
end

Policies serve two purposes:

• Authorization
• Scopes

Authorization is pretty self explainatory. It is the logic of whether or not an entity is allowed to perform an action.

Scopes are definition of data that an entity/user is allowed to access. While they are not required for SnFoil::Policies, they are required for SnFoil's CRUD helpers.

class PeopleContext
  include SnFoil::CRUD::Context

  policy PersonPolicy
end

Models are just the entity that the primary action of the CRUD context operates on. Simply put, its the Model.

class PeopleContext
  include SnFoil::CRUD::Context

  model Person
end

In order to be able to work with multiple data sources SnFoil allows you to create adapters for interacting with object. Adapters are just wrapper for your objects that add specific functionality needed by the base SnFoil::CRUD methods. SnFoil handles the wrapping and unwrapping for you under the hood.

We created an adapter for ActiveRecord for you, but you can also create your own by inheriting from SnFoil::Adapters::ORMs::BaseAdapter.

Just make sure your adapter defines the following methods:

• new - method to create a new datasource object. This should not commit to the data source
• all - method to grab all of a type from the data source
• save - method to commit an object to the data source
• destroy - method to remove an object from the data source
• attributes= - method for assigning a hash of attributes to the object

You can set your custom adapter by directly assigning it

SnFoil.orm = CustomAdapter

Or if you prefer an initializer style

SnFoil.configure do |config|
  config.orm = CustomAdapter
end

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 the created tag, and push the .gem file to rubygems.org.

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

The gem is available as open source under the terms of the Apache 2 License.

Everyone interacting in the Snfoil::Context project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.