Module: Mongoid::QueryCache::View

Extended by:
ActiveSupport::Concern
Defined in:
build/mongoid-7.0/lib/mongoid/query_cache.rb

Overview

Contains enhancements to the Mongo::Collection::View in order to get a cached cursor or a regular cursor on iteration.

Since:

  • 5.0.0

Instance Method Summary collapse

Instance Method Details

#each ⇒ Object

Override the default enumeration to handle if the cursor can be cached or not.

Examples:

Iterate over the view.

view.each do |doc|
  # ...
end

Since:

  • 5.0.0



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# File 'build/mongoid-7.0/lib/mongoid/query_cache.rb', line 225

def each
  if system_collection? || !QueryCache.enabled? || (respond_to?(:write?, true) && write?)
    super
  else
    @cursor = nil
    unless @cursor = cached_cursor

      if driver_supports_cursor_sessions?
        session = client.send(:get_session, @options)
        read_with_retry(session, server_selector) do |server|
          result = send_initial_query(server, session)
          @cursor = get_cursor(result, server, session)
        end
      else
        read_with_retry do
          server = server_selector.select_server(cluster)
          result = send_initial_query(server)
          @cursor = get_cursor(result, server)
        end
      end
    end

    if block_given?
      if limit && limit != -1
        @cursor.to_a[0...limit].each do |doc|
          yield doc
        end
      else
        @cursor.each do |doc|
          yield doc
        end
      end
    else
      @cursor.to_enum
    end
  end
end