Merge pull request #23146 from piotrj/issue_18424

When deleting through records, take into account association conditions

activerecord/CHANGELOG.md

+*   Take into account association conditions when deleting through records.
+
+    Fixes #18424.
+
+    *Piotr Jakubowski*
+
 *   Fix nested `has_many :through` associations on unpersisted parent instances.
 
     For example, if you have

activerecord/lib/active_record/associations/has_many_through_association.rb

@@ -140,6 +140,7 @@ def delete_records(records, method)
 
           scope = through_association.scope
           scope.where! construct_join_attributes(*records)
+          scope = scope.where(through_scope_attributes)
 
           case method
           when :destroy

activerecord/test/cases/associations/has_many_through_associations_test.rb

@@ -1308,6 +1308,25 @@ def test_incorrectly_ordered_through_associations
     end
   end
 
+  def test_has_many_through_update_ids_with_conditions
+    author = Author.create!(name: "Bill")
+    category = categories(:general)
+
+    author.update(
+      special_categories_with_condition_ids: [category.id],
+      nonspecial_categories_with_condition_ids: [category.id]
+    )
+
+    assert_equal [category.id], author.special_categories_with_condition_ids
+    assert_equal [category.id], author.nonspecial_categories_with_condition_ids
+
+    author.update(nonspecial_categories_with_condition_ids: [])
+    author.reload
+
+    assert_equal [category.id], author.special_categories_with_condition_ids
+    assert_equal [], author.nonspecial_categories_with_condition_ids
+  end
+
   def test_single_has_many_through_association_with_unpersisted_parent_instance
     post_with_single_has_many_through = Class.new(Post) do
       def self.name; "PostWithSingleHasManyThrough"; end

activerecord/test/models/author.rb

@@ -88,6 +88,9 @@ def ratings
   has_many :special_categories, through: :special_categorizations, source: :category
   has_one  :special_category,   through: :special_categorizations, source: :category
 
+  has_many :special_categories_with_conditions, -> { where(categorizations: { special: true }) }, through: :categorizations, source: :category
+  has_many :nonspecial_categories_with_conditions, -> { where(categorizations: { special: false }) }, through: :categorizations, source: :category
+
   has_many :categories_like_general, -> { where(name: "General") }, through: :categorizations, source: :category, class_name: "Category"
 
   has_many :categorized_posts, through: :categorizations, source: :post