add with_connection to support Rails 7.2 and load it only for for 7.1+

lib/polyamorous/activerecord/join_association_7_2.rb

@@ -0,0 +1,55 @@
+module Polyamorous
+  module JoinAssociationExtensions
+    # Same as #join_constraints, but instead of constructing tables from the
+    # given block, uses the ones passed
+    def join_constraints_with_tables(foreign_table, foreign_klass, join_type, alias_tracker, tables)
+      joins = []
+      chain = []
+
+      reflection.chain.each.with_index do |reflection, i|
+        table = tables[i]
+
+        @table ||= table
+        chain << [reflection, table]
+      end
+
+      base_klass.with_connection do |connection|
+        # The chain starts with the target table, but we want to end with it here (makes
+        # more sense in this context), so we reverse
+        chain.reverse_each do |reflection, table|
+          klass = reflection.klass
+
+          join_scope = reflection.join_scope(table, foreign_table, foreign_klass)
+
+          unless join_scope.references_values.empty?
+            join_dependency = join_scope.construct_join_dependency(
+              join_scope.eager_load_values | join_scope.includes_values, Arel::Nodes::OuterJoin
+            )
+            join_scope.joins!(join_dependency)
+          end
+
+          arel = join_scope.arel(alias_tracker.aliases)
+          nodes = arel.constraints.first
+
+          if nodes.is_a?(Arel::Nodes::And)
+            others = nodes.children.extract! do |node|
+              !Arel.fetch_attribute(node) { |attr| attr.relation.name == table.name }
+            end
+          end
+
+          joins << table.create_join(table, table.create_on(nodes), join_type)
+
+          if others && !others.empty?
+            joins.concat arel.join_sources
+            append_constraints(connection, joins.last, others)
+          end
+
+          # The current table in this iteration becomes the foreign table in the next
+          foreign_table, foreign_klass = table, klass
+        end
+
+        joins
+      end
+    end
+  end
+end

lib/polyamorous/polyamorous.rb

@@ -15,6 +15,10 @@ module Polyamorous
   require 'polyamorous/activerecord/join_dependency'
   require 'polyamorous/activerecord/reflection'
 
+  if ::ActiveRecord.version > ::Gem::Version.new("7.1")
+    require "polyamorous/activerecord/join_association_7_2"
+  end
+
   ActiveRecord::Reflection::AbstractReflection.send(:prepend, Polyamorous::ReflectionExtensions)
 
   Polyamorous::JoinDependency.send(:prepend, Polyamorous::JoinDependencyExtensions)