Dummy object relation

_mapping

{
    "users": {
        "mappings": {
            "user": {
                "properties": {
                    "user_forum_daily_stats": {
                        "type": "nested",
                        "include_in_parent": true,
                        "properties": {
                            "forum_id": {
                                "type": "string"
                            },
                            "comment_count": {
                                "type": "string"
                            },
                            "thread_count": {
                                "type": "string"
                            },
                            "stat_date": {
                                "type": "string"
                            },
                            "user_id": {
                                "type": "string"
                            }
                        }
                    },
                    "user_forums": {
                        "type": "nested",
                        "include_in_parent": true,
                        "properties": {
                            "forum_id": {
                                "type": "string"
                            },
                            "status": {
                                "type": "string"
                            }
                        }
                    },
                    "created_at": {
                        "type": "date",
                        "format": "dateOptionalTime"
                    },
                    "is_certified": {
                        "type": "boolean"
                    },
                    "login": {
                        "type": "string",
                        "analyzer": "snowball"
                    },
                    "name": {
                        "type": "string",
                        "analyzer": "snowball"
                    },
                    "sites": {
                        "properties": {
                            "description": {
                                "type": "string"
                            },
                            "name": {
                                "type": "string"
                            },
                            "url": {
                                "type": "string"
                            }
                        }
                    },
                    "unique_code": {
                        "type": "string",
                        "analyzer": "snowball"
                    }
                }
            }
        }
    }
}

gistfile1.rb

class User 
  attribute :login
  atrribute :name
  attribute :some_other_field
  has_many :sites
  has_many :relations
end 

class Site 
  attribute :url
  attribute :description
  attribute :name
end 

class UserForums
  belongs_to :user
  belongs_to :forum
end 

class Forum 
  attribute :name
  attribute :description 
  some_other_fields 
end 

class UserFroumDailyStats 
  belongs_to :user
  belongs_to :forum
end