Sparkl

Sparkl provides a decorator-like way of writing hooks for your Rails controllers. Example:

class MyController < ApplicationController
  extend Sparkl::Decoration

  def_decorator :special_auth, before_action: [:auth, if: -> { true or false }]

  special_auth def show
    # ... normal controller logic here
  end

  # instead of:
  # before_action :auth, only: [:show], if: -> { true or false }
end

Decorators can also be chained:

class MyController < ApplicationController
  extend Sparkl::Decoration

  def_decorator :no_auth, skip_before_action: :authorize
  def_decorator :verify_scope, after_action: ->() {
    # ... logic to check policy scoping...
  }

  verify_scope no_auth def show
    # ... normal controller logic here
  end

  # or with parentheses:
  # verify_scope(
  #   no_auth(
  #     def show
  #       # ... normal controller logic here
  #     end
  #   )
  # )
end

and can also be reused:

module MyActions
  extend Sparkl::Decorator

  def_decorator :redirect_if_true, before_action: [ :handle_redirect, { if: ->{ true } } ]

  private def handle_redirect
    redirect_to "..."
  end
end

class MyController < ApplicationController
  extend MyActions

  redirect_if_true def index
    # ...
  end
end

def_decorator is also aliased as decorator.

Installation

Add this line to your application's Gemfile:

gem 'sparkl'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install sparkl

Usage

See above for examples.

In the decorator definition, you define the moment the action will be performed - it can be performed at multiple times if you like:

decorator :foo, before_action: ->{ puts 'foo' }, after_action: ->{ puts :bar }

Available timings mirror Rails' own options:

before_action
prepend_before_action
after_action
prepend_after_action
skip_before_action
skip_after_action

Each action can take any of the arguments that a normal rails action would:

decorator :foo, before_action: [:do_foo, if: :condition?]

# ...

# need to have do_foo and condition? methods defined
def do_foo
  # ...
end

def condition?
  true
end

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

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/johansenja/sparkl.

License

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