Move the reimbursement category logic to Spree::Reimbursement

Add Spree::Reimbursement.store_credit_category_proc as a simple way
to redefine how the reimbursement category should be fetched.

Add Spree::Reimbursement#store_credit_category as the most natural
way to fetch a given category for a reimbursement.

This fixes reimbursement_category_name ending up in a translation
missing error. We need to lazily load the translation because, when
the file is loaded, Rails will still have to load translations from
the main application.

core/app/models/spree/reimbursement.rb

@@ -59,6 +59,20 @@ class IncompleteReimbursementError < StandardError; end
     class_attribute :reimbursement_failure_hooks
     self.reimbursement_failure_hooks = []
 
+    # The reimbursement_category_proc allows to fetch a specific reimbursement
+    # category for a given reimbursement, the fetched category is used as the
+    # category passed to Spree::Reimbursement::Credit.default_creditable_class.
+    #
+    # @param proc A proc that will accept a single "reimbursement" argument
+    class_attribute :store_credit_category_proc
+    self.store_credit_category_proc = ->(_reimbursement) {
+      name = Spree::Deprecation.silence { Spree::StoreCreditCategory.reimbursement_category_name }
+      name ||= I18n.t('spree.store_credit_category.default')
+
+      Spree::StoreCreditCategory.find_by(name: name) ||
+        Spree::StoreCreditCategory.first
+    }
+
     include ::Spree::Config.state_machines.reimbursement
 
     class << self
@@ -153,6 +167,11 @@ def return_all(created_by: nil)
       perform!(created_by: created_by)
     end
 
+    # @return [Spree::StoreCreditCategory]
+    def store_credit_category
+      store_credit_category_proc.call(self)
+    end
+
     private
 
     def calculate_total

core/app/models/spree/reimbursement_type/reimbursement_helpers.rb

@@ -54,7 +54,7 @@ def create_creditable(reimbursement, unpaid_amount, created_by:)
       Spree::Reimbursement::Credit.default_creditable_class.new(
         user: reimbursement.order.user,
         amount: unpaid_amount,
-        category: Spree::StoreCreditCategory.reimbursement_category(reimbursement),
+        category: reimbursement.store_credit_category,
         created_by: created_by,
         memo: "Refund for uncreditable payments on order #{reimbursement.order.number}",
         currency: reimbursement.order.currency

core/app/models/spree/store_credit_category.rb

@@ -4,12 +4,23 @@ class Spree::StoreCreditCategory < Spree::Base
   class_attribute :non_expiring_credit_types
   self.non_expiring_credit_types = [Spree::StoreCreditType::NON_EXPIRING]
 
+  # @deprecated
+  # Please use Spree::Reimbursement.store_credit_category_proc= instead.
   class_attribute :reimbursement_category_name
-  self.reimbursement_category_name = I18n.t('spree.store_credit_category.default')
 
-  def self.reimbursement_category(_reimbursement)
-    Spree::StoreCreditCategory.find_by(name: reimbursement_category_name) ||
-      Spree::StoreCreditCategory.first
+  # @deprecated
+  # Please use Spree::Reimbursement#store_credit_category instead.
+  def self.reimbursement_category(reimbursement)
+    reimbursement.store_credit_category
+  end
+
+  deprecate :reimbursement_category_name, deprecator: Spree::Deprecation
+  deprecate :reimbursement_category_name=, deprecator: Spree::Deprecation
+  deprecate :reimbursement_category_name?, deprecator: Spree::Deprecation
+  class << self
+    deprecate :reimbursement_category_name, deprecator: Spree::Deprecation
+    deprecate :reimbursement_category_name=, deprecator: Spree::Deprecation
+    deprecate :reimbursement_category, deprecator: Spree::Deprecation
   end
 
   def non_expiring?