class MongoMapper::Document::OrmAdapter

def column_names
  klass.column_names
end

def conditions_to_fields(conditions)
  conditions.inject({}) do |fields, (key, value)|
    if value.is_a?(MongoMapper::Document) && klass.key?("#{key}_id")
      fields.merge("#{key}_id" => value.id)
    else
      fields.merge(key => value)
    end
  end
end

def create!(attributes = {})
  klass.create!(attributes)
end

def destroy(object)
  object.destroy if valid_object?(object)
end

def find_all(conditions = {})
  conditions, order, limit, offset = extract_conditions!(conditions)
  conditions = conditions.merge(:sort => order) unless order.nil?
  conditions = conditions.merge(:limit => limit) unless limit.nil?
  conditions = conditions.merge(:offset => offset) unless limit.nil? || offset.nil?
  klass.all(conditions_to_fields(conditions))
end

def find_first(conditions = {})
  conditions, order = extract_conditions!(conditions)
  conditions = conditions.merge(:sort => order) unless order.nil?
  klass.first(conditions_to_fields(conditions))
end

def get(id)
  klass.first({ :id => wrap_key(id) })
end

def get!(id)
  klass.find!(wrap_key(id))
end