Class: Spree::TaxRate

Inherits:
Base
  • Object
show all
Includes:
AdjustmentSource, CalculatedAdjustments
Defined in:
app/models/spree/tax_rate.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

page

Methods included from Preferences::Preferable

#clear_preferences, #default_preferences, #defined_preferences, #get_preference, #has_preference!, #has_preference?, #preference_default, #preference_type, #set_preference

Class Method Details

.adjust(order, items) ⇒ Object

This method is best described by the documentation on #potentially_applicable?



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# File 'app/models/spree/tax_rate.rb', line 82

def self.adjust(order, items)
  rates = match(order.tax_zone)
  tax_categories = rates.map(&:tax_category)
  relevant_items, non_relevant_items = items.partition { |item| tax_categories.include?(item.tax_category) }
  Spree::Adjustment.where(adjustable: relevant_items).tax.destroy_all # using destroy_all to ensure adjustment destroy callback fires.
  relevant_items.each do |item|
    relevant_rates = rates.select { |rate| rate.tax_category == item.tax_category }
    store_pre_tax_amount(item, relevant_rates)
    relevant_rates.each do |rate|
      rate.adjust(order, item)
    end
  end
  non_relevant_items.each do |item|
    if item.adjustments.tax.present?
      item.adjustments.tax.destroy_all # using destroy_all to ensure adjustment destroy callback fires.
      item.update_columns pre_tax_amount: 0
    end
  end
end

.match(order_tax_zone) ⇒ Object

Gets the array of TaxRates appropriate for the specified order



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# File 'app/models/spree/tax_rate.rb', line 35

def self.match(order_tax_zone)
  return [] unless order_tax_zone

  potential_rates = potential_rates_for_zone(order_tax_zone)
  rates = potential_rates.includes(zone: { zone_members: :zoneable }).load.select do |rate|
    # Why "potentially"?
    # Go see the documentation for that method.
    rate.potentially_applicable?(order_tax_zone)
  end

  # Imagine with me this scenario:
  # You are living in Spain and you have a store which ships to France.
  # Spain is therefore your default tax rate.
  # When you ship to Spain, you want the Spanish rate to apply.
  # When you ship to France, you want the French rate to apply.
  #
  # Normally, Spree would notice that you have two potentially applicable
  # tax rates for one particular item.
  # When you ship to Spain, only the Spanish one will apply.
  # When you ship to France, you'll see a Spanish refund AND a French tax.
  # This little bit of code at the end stops the Spanish refund from appearing.
  #
  # For further discussion, see #4397 and #4327.
  rates.delete_if do |rate|
    rate.included_in_price? &&
    (rates - [rate]).map(&:tax_category).include?(rate.tax_category)
  end
end

.potential_rates_for_zone(zone) ⇒ Object 



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# File 'app/models/spree/tax_rate.rb', line 27

def self.potential_rates_for_zone(zone)
  select("spree_tax_rates.*, spree_zones.default_tax").
    joins(:zone).
    merge(Spree::Zone.potential_matching_zones(zone)).
    order("spree_zones.default_tax DESC")
end

.store_pre_tax_amount(item, rates) ⇒ Object

Pre-tax amounts must be stored so that we can calculate correct rate amounts in the future. For example: github.com/spree/spree/issues/4318#issuecomment-34723428



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# File 'app/models/spree/tax_rate.rb', line 67

def self.store_pre_tax_amount(item, rates)
  pre_tax_amount = case item
    when Spree::LineItem then item.discounted_amount
    when Spree::Shipment then item.discounted_cost
    end

  included_rates = rates.select(&:included_in_price)
  if included_rates.any?
    pre_tax_amount /= (1 + included_rates.map(&:amount).sum)
  end

  item.update_column(:pre_tax_amount, pre_tax_amount)
end

Instance Method Details

#adjust(order, item) ⇒ Object 



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# File 'app/models/spree/tax_rate.rb', line 151

def adjust(order, item)
  included = included_in_price && default_zone_or_zone_match?(order)
  create_adjustment(order, item, included)
end

#compute_amount(item) ⇒ Object 



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# File 'app/models/spree/tax_rate.rb', line 156

def compute_amount(item)
  refund = included_in_price && !default_zone_or_zone_match?(item.order)
  compute(item) * (refund ? -1 : 1)
end

#potentially_applicable?(order_tax_zone) ⇒ Boolean

Tax rates can potentially be applicable to an order. We do not know if they are/aren’t until we attempt to apply these rates to the items contained within the Order itself. For instance, if a rate passes the criteria outlined in this method, but then has a tax category that doesn’t match against any of the line items inside of the order, then that tax rate will not be applicable to anything. For instance:

Zones:

- Spain (default tax zone)
- France

Tax rates: (note: amounts below do not actually reflect real VAT rates)

21% inclusive - "Clothing" - Spain
18% inclusive - "Clothing" - France
10% inclusive - "Food" - Spain
8% inclusive - "Food" - France
5% inclusive - "Hotels" - Spain
2% inclusive - "Hotels" - France

Order has:

Line Item #1 - Tax Category: Clothing
Line Item #2 - Tax Category: Food

Tax rates that should be selected:

21% inclusive - "Clothing" - Spain
10% inclusive - "Food" - Spain

If the order’s address changes to one in France, then the tax will be recalculated:

18% inclusive - "Clothing" - France
8% inclusive - "Food" - France

Note here that the “Hotels” tax rates will not be used at all. This is because there are no items which have the tax category of “Hotels”.

Under no circumstances should negative adjustments be applied for the Spanish tax rates.

Those rates should never come into play at all and only the French rates should apply.

Returns:

  • (Boolean) 


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# File 'app/models/spree/tax_rate.rb', line 142

def potentially_applicable?(order_tax_zone)
  # If the rate's zone matches the order's tax zone, then it's applicable.
  self.zone == order_tax_zone ||
  # If the rate's zone *contains* the order's tax zone, then it's applicable.
  self.zone.contains?(order_tax_zone) ||
  # 1) The rate's zone is the default zone, then it's always applicable.
  (self.included_in_price? && self.zone.default_tax)
end