Class: Purpose Abstract

Inherits:
ApplicationRecord show all
Includes:
Relationship::Associations, SharedBehaviour::Named, Uuid::Uuidable
Defined in:
app/models/purpose.rb

Overview

This class is abstract.

Probably best to avoid using directly.

Note:

Purpose was originally just a property of plates and so was originally just PlatePurpose. As a result its table, and the foreign key on labware are plate_purposes and plate_purpose_id despite the fact they can now be applied to tubes as well.

The Purpose of a piece of Labware describes its role in the lab. While most labware will retain a single purpose through their life cycle, it is possible for purpose to be changed. Ideally this should be performed with a PlateConversion to ensure proper tracking.

Historically Purpose has modified the behaviour of its corresponding Labware, with a number of methods, such as Plate#state delegating to Plate#plate_purpose. While this is still occasionally required, it tends to result in quite brittle, unflexible behaviour. More recently we have been trying to push these differences in business logic outwards. In this new approach the Pipeline handles differences in behaviour, and the purpose acts merely as a tag, which can be used to inform the pipeline how it may wish to proceed. This approach makes Labware far more interchangeable.

Information about which purpose classes are used, and their last activity can be generated by running: `bundle exec rake report:purposes` in the appropriate environment. (Probably production)

Direct Known Subclasses

PlatePurpose, Tube::Purpose, TubeRack::Purpose

Defined Under Namespace

Classes: Relationship

Instance Method Summary collapse

Methods included from Uuid::Uuidable

included, #unsaved_uuid!, #uuid

Methods included from SharedBehaviour::Named

included

Methods included from Relationship::Associations

included

Methods inherited from ApplicationRecord

convert_labware_to_receptacle_for, find_by_id_or_name, find_by_id_or_name!

Methods included from Squishify

extended

Instance Method Details

#barcode_typeObject


82
83
84
# File 'app/models/purpose.rb', line 82

def barcode_type
  barcode_printer_type&.printer_type_id
end

#prefix=(prefix) ⇒ Object


90
91
92
# File 'app/models/purpose.rb', line 90

def prefix=(prefix)
  self.barcode_prefix = BarcodePrefix.find_or_create_by(prefix: prefix)
end

#set_default_barcode_prefixObject


94
95
96
# File 'app/models/purpose.rb', line 94

def set_default_barcode_prefix
  self.prefix ||= default_prefix
end

#source_plate(labware) ⇒ Object


58
59
60
61
62
63
64
65
66
# File 'app/models/purpose.rb', line 58

def source_plate(labware)
  # Stock_plate is deprecated, but we still have some tubes with special behaviour
  # We'll allow its usage here to support existing code.
  ActiveSupport::Deprecation.silence do
    # Rails 6 lets us do this:
    # ActiveSupport::Deprecation.allow(:stock_plate) do
    source_purpose_id.present? ? labware.ancestor_of_purpose(source_purpose_id) : labware.try(:stock_plate)
  end
end

#source_plates(labware) ⇒ Object


68
69
70
71
72
73
74
75
76
# File 'app/models/purpose.rb', line 68

def source_plates(labware)
  # Stock_plate is deprecated, but we still have some tubes with special behaviour
  # We'll allow its usage here
  ActiveSupport::Deprecation.silence do
    # Rails 6 lets us do this:
    # ActiveSupport::Deprecation.allow(:stock_plate) do
    source_purpose_id.present? ? labware.ancestors_of_purpose(source_purpose_id) : [labware.try(:stock_plate)].compact
  end
end

#source_purpose_name=(source_purpose_name) ⇒ Object


78
79
80
# File 'app/models/purpose.rb', line 78

def source_purpose_name=(source_purpose_name)
  self.source_purpose = Purpose.find_by!(name: source_purpose_name)
end

#target_classObject


86
87
88
# File 'app/models/purpose.rb', line 86

def target_class
  target_type.constantize
end