用rake跑reindex

rake sunspot:reindex

如果是只reindex其中一個model，可以下：

rake sunspot:reindex[,ModelName]

注意在zsh中要用\跳脫[]字元

rake sunspot:reindex\[,ModelName\]

要注意save自動更新index的行為

在預設的sunspot設定下，只要是使用Searchable的model，在做儲存時，會自動更新這筆資料的index。但要注意的是，即使是沒更新任何attribute的值，只要呼叫到save，更新index的動作還是會進行，如果你的searchable中定義的field太複雜(例如有關聯到其它的model資料)，那每一次儲存都會造成大量的query。

Trace Code

從下面的sunspot_rails原始碼可以發現，searchable會用到before_save與after_save這兩個callback，在before_save時去決定是否要做index，而在after_save去執行更新index的動作。

def searchable(options = {}, &block)
  Sunspot.setup(self, &block)
  if searchable?
    sunspot_options[:include].concat(Util::Array(options[:include]))
  else
    extend ClassMethods
    include InstanceMethods
    class_attribute :sunspot_options

    unless options[:auto_index] == false
      before_save :mark_for_auto_indexing_or_removal
      after_save :perform_index_tasks
    end

    unless options[:auto_remove] == false
      after_destroy do |searchable|
        searchable.remove_from_index
      end
    end
    options[:include] = Util::Array(options[:include])

    self.sunspot_options = options
  end
end

在before_save callback，會呼叫mark_for_auto_indexing_or_removal，我們可以發現sunspot提供很多的option來決定是否要做index。你甚至可以關掉自動index的功能，手動來控制index的行為。

def mark_for_auto_indexing_or_removal
  if indexable?
    # :if/:unless constraints pass or were not present

    @marked_for_auto_indexing =
      if !new_record? && ignore_attributes = self.class.sunspot_options[:ignore_attribute_changes_of]
        !(changed.map { |attr| attr.to_sym } - ignore_attributes).blank?
      elsif !new_record? && only_attributes = self.class.sunspot_options[:only_reindex_attribute_changes_of]
        !(changed.map { |attr| attr.to_sym } & only_attributes).blank?
      else
        true
      end
    @marked_for_auto_removal = false
  else
    # :if/:unless constraints did not pass; do not auto index and
    # actually go one step further by removing it from the index
    @marked_for_auto_indexing = false
    @marked_for_auto_removal = true
  end
  true
end

def perform_index_tasks
  if @marked_for_auto_indexing
    solr_index
    remove_instance_variable(:@marked_for_auto_indexing)
  elsif @marked_for_auto_removal
    solr_remove_from_index
    remove_instance_variable(:@marked_for_auto_removal)
  end
end

暫時關掉更新model時自動做的reindex

Sunspot.session = Sunspot::Rails::StubSessionProxy.new(Sunspot.session)
#
# ... 這裡寫你想執行的程式，但不會觸發reindex
#
Sunspot.session = Sunspot.session.original_session

Ref

• SO -Can I instruct Solr (Sunspot) to skip reindexing for a block of code?