Module: Renalware::Sortable

Extended by:
ActiveSupport::Concern
Included in:
Admissions::Request, HD::Station, Problems::Problem
Defined in:
app/models/concerns/renalware/sortable.rb

Instance Method Summary collapse

Instance Method Details

#set_position ⇒ Object

Invoked by the callback when a record is created to set the initial value of #position. If no position_sorting_scope is defined on the model class, we set position to the max position in the whole table. If position_sorting_scope is provided we use it to refine the grouping and hence the max(position) found - for example to get the max position where patient_id = 123

Example scope in a model:

scope :position_sorting_scope, ->(problem) { where(patient_id: problem.patient.id) }



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# File 'app/models/concerns/renalware/sortable.rb', line 38

def set_position
  return unless respond_to?(:position)

  scope = if self.class.respond_to?(:position_sorting_scope)
            self.class.position_sorting_scope(self)
          else
            self.class
          end
  self.position = (scope.maximum(:position) || 0) + 1
end