Acceptance

acceptance.rb

class Acceptance
  include ActiveModel::Model
  include ActiveModel::Validations
  extend ActiveModel::Naming

  class Type < Struct.new(:list?, :all?, :individual?); end

  attr_accessor :invitation_id
  attr_accessor :invitation_ids
  attr_accessor :user_id
  validates_presence_of :user, :invitation_id
  validates_presence_of :invitation_ids, if: -> { type.list? }

  def type
    Acceptance::Type.new(
      invitation_id.to_s == 'list' rescue false,
      invitation_id.to_s == 'all' rescue false,
      not invitation_id.to_s.in? %w(list all)
    )
  end

  def user= user
    @user = user
    @user_id = user
  end

  def user
    @user ||= User.first(user_id)
  end

  def invitations
    if type.all?
      user.pending_friend_requests
    elsif type.list?
      user.pending_friend_requests.where(id: invitation_ids)
    else
      [Invitiation.first(invitation_id)].compact
    end
  end

  def save
    return false unless valid?

    invitations.each do |invitation|
      user.add_friend(invitation.sender)
    end
  end
end

class Ignorance < Acceptance
  def save
    invitations.each do |invitation|
      invitation.update_attribute :ignored, true
    end
  end
end

#USAGE:

# acceptance = Acceptance.new acceptance_params
# acceptance.user = current_user
# acceptance.invitiation_id = params[:invitation_id]

# if acceptance.save
# flash and redirect
# else
# errors and redirect