Class: Calculator::RelatedProductDiscount

Inherits:
Spree::Calculator
  • Object
show all
Defined in:
app/models/spree/calculator/related_product_discount.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.description ⇒ Object 



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# File 'app/models/spree/calculator/related_product_discount.rb', line 3

def self.description
  Spree.t(:related_product_discount)
end

Instance Method Details

#compute(object) ⇒ Object 



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# File 'app/models/spree/calculator/related_product_discount.rb', line 7

def compute(object)
  if object.is_a?(Array)
    return if object.empty?
    order = object.first.order
  else
    order = object
  end

  return unless eligible?(order)
  total = order.line_items.inject(0) do |sum, line_item|
    relations = Spree::Relation.where(*discount_query(line_item))
    discount_applies_to = relations.map { |rel| rel.related_to.master }

    order.line_items.each do |li|
      next li unless discount_applies_to.include? li.variant
      discount = relations.detect { |rel| rel.related_to.master == li.variant }.discount_amount
      sum += if li.quantity < line_item.quantity
               (discount * li.quantity)
             else
               (discount * line_item.quantity)
             end
    end

    sum
  end

  total
end

#discount_query(line_item) ⇒ Object 



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# File 'app/models/spree/calculator/related_product_discount.rb', line 42

def discount_query(line_item)
  [
    'discount_amount <> 0.0 AND relatable_type = ? AND relatable_id = ?',
    'Spree::Product',
    line_item.variant.product.id
  ]
end

#eligible?(order) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/models/spree/calculator/related_product_discount.rb', line 36

def eligible?(order)
  order.line_items.any? do |line_item|
    Spree::Relation.exists?(discount_query(line_item))
  end
end