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# frozen_string_literal: true
module Renalware
module Sortable
extend ActiveSupport::Concern
# Assumes that the model has the #position attribute and adds 2 features to a model that
# includes it:
# 1. Set the :position to the next highest value when a new row is added. If the model has a
# position_sorting_scope scope or class method, this is used to narrow the range of records
# searched when finding the current max position
# 2. Add ability to sort rows based on an array of ids.
included do
before_create :set_position
end
class_methods do
# A controller #sort action might for instance invoke this class method on an object.
# The array of ids are the model to sort, and sorting is done by updating each model's
# position to reflect their place in the array.
def sort(ids)
Array(ids).each_with_index do |id, index|
where(id: id).update_all(["position=?", index + 1])
end
end
end
# 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) }
#
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
end
end
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15 entries across 15 versions & 1 rubygems