```ruby
class Task < ActiveRecord::Base
  include Taskable
  include Completable

  # Associations
  has_many :location_assignments
  has_many :locations, through: :location_assignments

  # Enums
  enum duration: [:hours_1, :hours_2, :hours_3, :half_day, :all_day]

  # wrapping the attribute in a StringEnquirer allows task.scheduling_type.between?,
  # but still returns "between" for task.scheduling_type
  def scheduling_type
    read_attribute(:scheduling_type).inquiry
  end

  def primary_location
    locations.where(task_location_assignments:{ primary: true}).first
  end

  def extra_locations
    locations.where(task_location_assignments:{ primary: false})
  end

end
```

Fix inquiry in case scheduling_type is nil
user
```ruby
class Task < ActiveRecord::Base
  include Taskable
  include Completable

  # Associations
  has_many :location_assignments
  has_many :locations, through: :location_assignments

  # Enums
  enum duration: [:hours_1, :hours_2, :hours_3, :half_day, :all_day]

  # wrapping the attribute in a StringEnquirer allows task.scheduling_type.between?,
  # but still returns "between" for task.scheduling_type
  def scheduling_type
    read_attribute(:scheduling_type).try(:inquiry)
  end

  def primary_location
    locations.where(task_location_assignments:{ primary: true}).first
  end

  def extra_locations
    locations.where(task_location_assignments:{ primary: false})
  end

end
```
assistant