Merge pull request #19388 from yakara-ltd/fix-habtm-fixture-order

Avoid violating key constraints in fixture HABTM associations

activerecord/lib/active_record/fixture_set/table_rows.rb

@@ -45,6 +45,9 @@ def initialize(table_name, model_class:, fixtures:, config:)
         # track any join tables we need to insert later
         @tables = Hash.new { |h, table| h[table] = [] }
 
+        # ensure this table is loaded before any HABTM associations
+        @tables[table_name] = nil
+
         build_table_rows_from(fixtures, config)
       end
 

activerecord/test/cases/fixtures_test.rb

@@ -619,6 +619,10 @@ def test_has_many_through_with_renamed_table
     assert_equal load_has_and_belongs_to_many["parrots_treasures"], rows["parrot_treasures"]
   end
 
+  def test_has_and_belongs_to_many_order
+    assert_equal ["parrots", "parrots_treasures"], load_has_and_belongs_to_many.keys
+  end
+
   def load_has_and_belongs_to_many
     parrot = make_model "Parrot"
     parrot.has_and_belongs_to_many :treasures