Class: Mingo::Cursor

Inherits:
Mongo::Cursor
  • Object
show all
Defined in:
lib/mingo/cursor.rb

Overview

Custom Cursor subclass. TODO: contribute this to the official driver

Defined Under Namespace

Modules: CollectionPlugin

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.from_mongo(cursor) ⇒ Object 



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# File 'lib/mingo/cursor.rb', line 19

def self.from_mongo(cursor)
  new(cursor.collection).tap do |sub|
    cursor.instance_variables.each { |ivar|
      sub.instance_variable_set(ivar, cursor.instance_variable_get(ivar))
    }
  end
end

Instance Method Details

#by_ids? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mingo/cursor.rb', line 31

def by_ids?
  Hash === selector[:_id] && selector[:_id]["$in"]
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mingo/cursor.rb', line 27

def empty?
  !has_next?
end

#reverse ⇒ Object 



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# File 'lib/mingo/cursor.rb', line 35

def reverse
  check_modifiable
  if by_ids? and !order
    selector[:_id]["$in"] = selector[:_id]["$in"].reverse
    self
  elsif order && (!(Array === order) || !(Array === order.first) || order.size == 1)
    if Array === order
      field, dir = *order.flatten
      dir = Mongo::Conversions::ASCENDING_CONVERSION.include?(dir.to_s) ? -1 : 1
    else
      field = order
      dir = -1
    end
    sort(field, dir)
  else
    raise "can't reverse complex query"
  end
end