Class: Groupy::EntityGrouper

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

Constant Summary collapse

@@defaultScoreFunction = 
'function(tag) { return 1; }'
@@defaultIncludeFunction = 
'function(tag) { return true; }'
@@dynamicTagFunction = 
'function(doc) {}'

Instance Method Summary collapse

Constructor Details

#initialize(database, entity) ⇒ EntityGrouper

Returns a new instance of EntityGrouper.



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# File 'lib/rugroupy/group.rb', line 10

def initialize(database, entity)
  @database = database
  @entity = entity
  @database["#{@entity}_count"].indexes.create_many([
                                                      { key: { '_id.tag' => -1 }, background: false },
                                                      { key: { 'value.count' => -1 }, background: false }
                                                    ])
end

Instance Method Details

#count_entities(scoreFunction) ⇒ Object 



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# File 'lib/rugroupy/group.rb', line 38

def count_entities(scoreFunction)
  map = BSON::Code.new(<<eos)
    function() {
      var score = #{scoreFunction},
          tag = this._id.tag,
          tagScore = score(tag),
          entities = this.value.entities.slice(0).sort();
      for (x in entities) {
        for (y in entities) {
          if (x < y) {
            emit({tag:tag, e:[entities[x], entities[y]]}, {count:tagScore});
            emit({e:[entities[x], entities[y]]}, {count:tagScore});
          }
        }
      }
    }
eos

  reduce = BSON::Code.new(<<eos)
    function(key, values) {
      var result = {count:0};
      values.forEach(function(value) {
        result.count += value.count;
      });
      return result;
    }
eos

  @database["#{@entity}_invert"].find.map_reduce(map, reduce, out: "#{@entity}_count").execute
  nil
end

#group(options = {}) ⇒ Object 



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# File 'lib/rugroupy/group.rb', line 32

def group(options = {})
  invert_entities(options[:includeFunction] || @@defaultIncludeFunction,
                  options[:dynamicTagFunction] || @@dynamicTagFunction)
  count_entities(options[:scoreFunction] || @@defaultScoreFunction)
end

#invert_entities(includeFunction, dynamicTagFunction) ⇒ Object 



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# File 'lib/rugroupy/group.rb', line 70

def invert_entities(includeFunction, dynamicTagFunction)
  map = BSON::Code.new(<<eos)
    function() {
      var include = #{includeFunction},
          dynamicTagFunction = #{dynamicTagFunction},
          entity_id = this._id;
      if (this.tags) {
        for (tag in this.tags) {
          if (!include(tag)) continue;
          this.tags[tag].forEach(function(z) {
            emit({tag:tag, value:z}, {entities: [entity_id]});
          });
        }
        dynamicTagFunction(this);
      }
    }
eos

  reduce = BSON::Code.new(<<eos)
    function(key, values) {
      var result = {entities:[]};
      values.forEach(function(value) {
        value['entities'].forEach(function(entity_id) {
          result['entities'].push( entity_id );
        });
      });
      return result;
    }
eos
  @database[@entity].find.map_reduce(map, reduce, out: "#{@entity}_invert").execute
  nil
end

#similiar(tag = nil, skip = nil, limit = nil, reverse = false) ⇒ Object 



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# File 'lib/rugroupy/group.rb', line 19

def similiar(tag = nil, skip = nil, limit = nil, reverse = false)
  q = BSON::Document.new
  q['_id.tag'] = tag ? tag : { '$exists' => false }
  opts = {
    projection: { '_id.e' => 1 },
    sort: { 'value.count' => reverse ? 1 : -1 }
  }
  opts[:skip] = skip if skip
  opts[:limit] = limit if limit
  cursor = @database["#{@entity}_count"].find(q, opts)
  cursor.collect { |r| r['_id']['e'] }
end