Allow `where` with through association to be expanded condition

activerecord/lib/active_record/relation/predicate_builder.rb

@@ -86,6 +86,10 @@ def expand_from_hash(attributes, &block)
                 value = [value] unless value.is_a?(Array)
                 klass = PolymorphicArrayValue
               end
+            elsif associated_table.through_association?
+              next associated_table.predicate_builder.expand_from_hash(
+                associated_table.association_join_foreign_key => value
+              )
             end
 
             klass ||= AssociationQueryValue

activerecord/lib/active_record/table_metadata.rb

@@ -55,6 +55,10 @@ def polymorphic_association?
       reflection&.polymorphic?
     end
 
+    def through_association?
+      reflection&.through_reflection?
+    end
+
     def reflect_on_aggregation(aggregation_name)
       klass&.reflect_on_aggregation(aggregation_name)
     end

activerecord/test/cases/relation/where_test.rb

@@ -25,6 +25,10 @@ def test_type_casting_nested_joins
       assert_equal [comment], Comment.joins(post: :author).where(authors: { id: "2-foo" })
     end
 
+    def test_where_with_through_association
+      assert_equal [authors(:david)], Author.joins(:comments).where(comments: comments(:greetings))
+    end
+
     def test_type_cast_is_not_evaluated_at_relation_build_time
       posts = nil