Module: Recommendable::Rater::Disliker

Defined in:
lib/recommendable/rater/disliker.rb

Instance Method Summary collapse

Instance Method Details

#dislike(obj) ⇒ Object

Dislike an object. This will remove the item from a user’s set of likes or hidden items

Parameters:

  • obj (Object) —

    the object to be disliked

Returns:

  • true if object was disliked successfully

Raises:

  • (ArgumentError) —

    if the passed object was not declared ratable



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# File 'lib/recommendable/rater/disliker.rb', line 10

def dislike(obj)
  raise(ArgumentError, 'Object has not been declared ratable.') unless obj.respond_to?(:recommendable?) && obj.recommendable?
  return if dislikes?(obj)

  run_hook(:before_dislike, obj)
  Recommendable.redis.sadd(Recommendable::Helpers::RedisKeyMapper.disliked_set_for(obj.class, id), obj.id)
  Recommendable.redis.sadd(Recommendable::Helpers::RedisKeyMapper.disliked_by_set_for(obj.class, obj.id), id)
  run_hook(:after_dislike, obj)

  true
end

#dislikes ⇒ Array

Retrieve an array of objects the user has disliked

Returns:

  • (Array) —

    an array of records



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# File 'lib/recommendable/rater/disliker.rb', line 48

def dislikes
  Recommendable.config.ratable_classes.map { |klass| disliked_for(klass) }.flatten
end

#dislikes?(obj) ⇒ Boolean

Check whether the user has disliked an object.

Parameters:

  • obj (Object) —

    the object in question

Returns:

  • (Boolean) —

    true if the user has disliked obj, false if not



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# File 'lib/recommendable/rater/disliker.rb', line 26

def dislikes?(obj)
  Recommendable.redis.sismember(Recommendable::Helpers::RedisKeyMapper.disliked_set_for(obj.class, id), obj.id)
end

#dislikes_count ⇒ Fixnum

Get the number of items the user has disliked

Returns:

  • (Fixnum) —

    the number of disliked items



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# File 'lib/recommendable/rater/disliker.rb', line 62

def dislikes_count
  Recommendable.config.ratable_classes.inject(0) do |sum, klass|
    sum + disliked_count_for(klass)
  end
end

#dislikes_in_common_with(user) ⇒ Array

Retrieve an array of objects both this user and another user have disliked

Returns:

  • (Array) —

    an array of records



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# File 'lib/recommendable/rater/disliker.rb', line 55

def dislikes_in_common_with(user)
  Recommendable.config.ratable_classes.map { |klass| disliked_in_common_with(klass, user) }.flatten
end

#undislike(obj) ⇒ Object

Undislike an object. This removes the object from a user’s set of dislikes.

Parameters:

  • obj (Object) —

    the object to be undisliked

Returns:

  • true if the object was disliked successfully, nil if the object wasn’t already disliked



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# File 'lib/recommendable/rater/disliker.rb', line 34

def undislike(obj)
  return unless dislikes?(obj)

  run_hook(:before_undislike, obj)
  Recommendable.redis.srem(Recommendable::Helpers::RedisKeyMapper.disliked_set_for(obj.class, id), obj.id)
  Recommendable.redis.srem(Recommendable::Helpers::RedisKeyMapper.disliked_by_set_for(obj.class, obj.id), id)
  run_hook(:after_undislike, obj)

  true
end