Module: Sinja::Resource

Defined in:
lib/sinja/resource.rb

Constant Summary collapse

ARITIES = 
{
  :create=>2,
  :index=>-1,
  :fetch=>-1,
  :show_many=>-1
}.tap { |h| h.default = 1 }.freeze

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.registered(app) ⇒ Object 



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# File 'lib/sinja/resource.rb', line 23

def self.registered(app)
  app.helpers Helpers::Relationships do
    attr_accessor :resource
  end

  app.register ResourceRoutes
end

Instance Method Details

#def_action_helper(context, action, allow_opts = []) ⇒ Object 



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# File 'lib/sinja/resource.rb', line 31

def def_action_helper(context, action, allow_opts=[])
  abort "Action helper names can't overlap with Sinatra DSL" \
    if Sinatra::Base.respond_to?(action)

  context.define_singleton_method(action) do |**opts, &block|
    abort "Unexpected option(s) for `#{action}' action helper" \
      unless (opts.keys - Array(allow_opts)).empty?

    resource_config[action].each do |k, v|
      v.replace(Array(opts[k])) if opts.key?(k)
    end

    return unless block ||=
      case !method_defined?(action) && action
      when :show
        proc { resource } if method_defined?(:find)
      end

    required_arity = ARITIES[action]

    define_method(action) do |*args|
      raise ArgumentError, "Unexpected argument(s) for `#{action}' action helper" \
        unless args.length == block.arity

      public_send("before_#{action}", *args.take(method("before_#{action}").arity.abs)) \
        if respond_to?("before_#{action}")

      case result = instance_exec(*args, &block)
      when Array
        opts = {}
        if result.last.instance_of?(Hash)
          opts = result.pop
        elsif required_arity < 0 && !result.first.is_a?(Array)
          result = [result]
        end

        raise ActionHelperError, "Unexpected return value(s) from `#{action}' action helper" \
          unless result.length == required_arity.abs

        result.push(opts)
      when Hash
        Array.new(required_arity.abs).push(result)
      else
        [result, nil].take(required_arity.abs).push({})
      end
    end

    define_singleton_method("remove_#{action}") do
      remove_method(action) if respond_to?(action)
    end
  end
end