Contents

class Policy
  attr_reader :model, :user, :action

  def initialize model:, user: nil
    @model = model
    @user  = user || Policy.current_user
  end

  # pass block if you want to handle errors yourself
  # return true if false if block is passed
  def can? action, *args, &block
    @action = action
      .to_s
      .gsub(/[^\w+]/, '')
      .concat('?')
      .to_sym

    # pre check
    if %i(can).index(@action)
      raise RuntimeError.new('Method name not allowed')
    end

    unless respond_to?(@action)
      raise NoMethodError.new(%[Policy check "#{@action}" not found in #{self.class}])
    end

    call *args, &block
  end

  def can
    Proxy.new self
  end

  private

  # call has to be isolated because of specifics in handling
  def call *args, &block
    return true if before(@action) == true
    return true if send(@action, *args)

    error 'Access disabled in policy'
  rescue Policy::Error => error
    message = error.message
    message += " - #{self.class}##{@action}"

    if block
      block.call message
      false
    else
      error message
    end
  end

  def before action
    false
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
egoist-0.9.0	./lib/egoist/base.rb
egoist-0.8.0	./lib/egoist/base.rb