Extract the ransack patch to a separate file

core/lib/solidus_core.rb

@@ -1,20 +1,3 @@
 # frozen_string_literal: true
 
 require 'spree_core'
-
-class Arel::Table
-  def table_name
-    name
-  end
-end
-
-
-module RansackNodeConditionPatch
-  private
-
-  def casted_array?(predicate)
-    predicate.is_a?(Arel::Nodes::Casted) && predicate.value.is_a?(Array)
-  end
-
-  Ransack::Nodes::Condition.prepend(self)
-end

core/lib/spree/core.rb

@@ -19,8 +19,11 @@
 require 'monetize'
 require 'paperclip'
 require 'ransack'
+require 'state_machines-activemodel'
 require 'state_machines-activerecord'
 
+require_relative './ransack-4-1-patch'
+
 # This is required because ActiveModel::Validations#invalid? conflicts with the
 # invalid state of a Payment. In the future this should be removed.
 StateMachines::Machine.ignore_method_conflicts = true

core/lib/spree/ransack_4_1_patch.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+require "ransack/version"
+
+return unless Ransack::VERSION.start_with?("4.1.")
+
+module RansackNodeConditionPatch
+  private
+
+  # Waiting for https://github.com/activerecord-hackery/ransack/pull/1468
+  def casted_array?(predicate)
+    predicate.is_a?(Arel::Nodes::Casted) && predicate.value.is_a?(Array)
+  end
+
+  Ransack::Nodes::Condition.prepend(self)
+end