Class: MongoHydrator

Inherits:
Object
  • Object
show all
Defined in:
lib/mongo_hydrator.rb

Instance Method Summary collapse

Constructor Details

#initialize(collection, options = {}) ⇒ MongoHydrator

Create a new MongoHydrator instance

collection – The Mongo::Collection instance from which to fetch

subdocuments during hydration

options – Optional hash containing options to pass to

collection.find. Typically used to specify a :fields
option to limit the fields included in the subdocuments.

Returns the new MongoHydrator instance.



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# File 'lib/mongo_hydrator.rb', line 14

def initialize(collection, options = {})
  @hydration_proc = Proc.new do |ids|
    if options[:fields]
      # We need the_id key in order to assemble the results hash.
      # If the caller has requested that it be omitted from the
      # result, re-enable it and then strip later.
      field_selectors = options[:fields]
      id_key = field_selectors.keys.detect { |k| k.to_s == '_id' }
      if id_key && field_selectors[id_key] == 0
        field_selectors.delete(id_key)
        strip_id = true
      end
    end
    subdocuments = collection.find({ '_id' => { '$in' => ids } }, options)
    subdocuments.inject({}) do |hash, subdocument|
      hash[subdocument['_id']] = subdocument
      subdocument.delete('_id') if strip_id
      hash
    end
  end
end

Instance Method Details

#hydrate_document(document, path_or_paths) ⇒ Object 



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# File 'lib/mongo_hydrator.rb', line 36

def hydrate_document(document, path_or_paths)
  DocumentHydrator.hydrate_document(document, path_or_paths, @hydration_proc)
end