```ruby
class Review < ActiveRecord::Base
  belongs_to :user
  belongs_to :performance

  validates :user, presence: true
  validates :performance, presence: true
  validates :rating, presence: true, numericality: {
    greater_than: 0, less_than_or_equal_to: 5, only_integer: true
  }

  scope :beloved, -> { where(rating: 5) }
  scope :recent, -> { where("created_at > ?", 5.days.ago) }
  scope :for, ->(performance) { where(performance: performance) }
  scope :by, ->(user) { where(user: user) }

  def self.recent_ratings(performance)
    recent.for(performance).average(:rating)
  end

  def sentiment
    recent = self.class.recent_ratings(self.performance)

    if self.rating > (recent + 0.5)
      :happy
    elsif self.rating < (recent - 0.5)
      :sad
    else
      :meh
    end
  end
end
```

Fix scope recent in Review
user
```ruby
class Review < ActiveRecord::Base
  belongs_to :user
  belongs_to :performance

  validates :user, presence: true
  validates :performance, presence: true
  validates :rating, presence: true, numericality: {
    greater_than: 0, less_than_or_equal_to: 5, only_integer: true
  }

  scope :beloved, -> { where(rating: 5) }
  scope :recent, -> { where("reviews.created_at > ?", 5.days.ago) }
  scope :for, ->(performance) { where(performance: performance) }
  scope :by, ->(user) { where(user: user) }

  def self.recent_ratings(performance)
    recent.for(performance).average(:rating)
  end

  def sentiment
    recent = self.class.recent_ratings(self.performance)

    if self.rating > (recent + 0.5)
      :happy
    elsif self.rating < (recent - 0.5)
      :sad
    else
      :meh
    end
  end
end
```
assistant