test: cover OrmPolymorphicCounterCacheTest and teardown

test/test_orm_polymorphic_counter_cache.rb

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+require 'minitest/autorun'
+require 'prism'
+require 'tmpdir'
+
+class OrmPolymorphicCounterCacheTest < Minitest::Test
+  def setup
+    @dir = Dir.mktmpdir('prism-polymorphic-counter-cache-store')
+    @store = Prism::Orm::Store.new(File.join(@dir, 'test.pstore'))
+    @store.create_table(:posts, %w[id title likes_count])
+    @store.create_table(:photos, %w[id caption likes_count])
+    @store.create_table(:likes, %w[id likeable_id likeable_type user_id deleted_at])
+    @store.create_table(:reactions, %w[id reactable_id reactable_type score])
+    @store.create_table(:posts_with_tally, %w[id title reactions_tally])
+
+    post_class = Class.new(Prism::Orm::Model) do
+      table_name :posts
+    end
+    photo_class = Class.new(Prism::Orm::Model) do
+      table_name :photos
+    end
+    like_class = Class.new(Prism::Orm::Model) do
+      table_name :likes
+      acts_as_paranoid
+      belongs_to :likeable, polymorphic: true, counter_cache: true
+    end
+    tally_post_class = Class.new(Prism::Orm::Model) do
+      table_name :posts_with_tally
+    end
+    reaction_class = Class.new(Prism::Orm::Model) do
+      table_name :reactions
+      belongs_to :reactable, polymorphic: true, counter_cache: :reactions_tally
+    end
+    [post_class, photo_class, like_class, tally_post_class, reaction_class].each { |klass| klass.store = @store }
+    Object.const_set(:Post, post_class)
+    Object.const_set(:Photo, photo_class)
+    Object.const_set(:Like, like_class)
+    Object.const_set(:PostWithTally, tally_post_class)
+    Object.const_set(:Reaction, reaction_class)
+  end
+
+  def teardown
+    FileUtils.remove_entry(@dir)
+    %i[Post Photo Like PostWithTally Reaction].each do |name|
+      Object.send(:remove_const, name) if Object.const_defined?(name)
+    end
+  end
+
+  def test_create_increments_the_default_column_on_the_right_owner_type
+    post = Post.create!(title: 'hello', likes_count: 0)
+    photo = Photo.create!(caption: 'sunset', likes_count: 0)
+
+    Like.create!(likeable_id: post.id, likeable_type: 'Post', user_id: 1)
+    Like.create!(likeable_id: photo.id, likeable_type: 'Photo', user_id: 1)
+    Like.create!(likeable_id: photo.id, likeable_type: 'Photo', user_id: 2)
+
+    assert_equal 1, post.reload.likes_count
+    assert_equal 2, photo.reload.likes_count
+  end
+
+  def test_destroy_decrements_the_owner_of_the_recorded_type
+    post = Post.create!(title: 'hello', likes_count: 0)
+    like = Like.create!(likeable_id: post.id, likeable_type: 'Post', user_id: 1)
+
+    like.destroy
+
+    assert_equal 0, post.reload.likes_count
+  end
+
+  def test_restoring_a_soft_deleted_like_reincrements_the_original_owner_type
+    photo = Photo.create!(caption: 'sunset', likes_count: 0)
+    like = Like.create!(likeable_id: photo.id, likeable_type: 'Photo', user_id: 1)
+    like.destroy
+    assert_equal 0, photo.reload.likes_count
+
+    like.restore
+
+    assert_equal 1, photo.reload.likes_count
+  end
+
+  def test_reassigning_across_owner_types_moves_the_count_from_one_table_to_the_other
+    post = Post.create!(title: 'hello', likes_count: 0)
+    photo = Photo.create!(caption: 'sunset', likes_count: 0)
+    like = Like.create!(likeable_id: post.id, likeable_type: 'Post', user_id: 1)
+
+    like.likeable = photo
+    like.save!
+
+    assert_equal 0, post.reload.likes_count
+    assert_equal 1, photo.reload.likes_count
+  end
+
+  def test_reassigning_within_the_same_owner_type_moves_the_count
+    post_a = Post.create!(title: 'a', likes_count: 0)
+    post_b = Post.create!(title: 'b', likes_count: 0)
+    like = Like.create!(likeable_id: post_a.id, likeable_type: 'Post', user_id: 1)
+
+    like.update!(likeable_id: post_b.id)
+
+    assert_equal 0, post_a.reload.likes_count
+    assert_equal 1, post_b.reload.likes_count
+  end
+
+  def test_creating_without_an_owner_does_not_raise_or_touch_anything
+    Like.create!(likeable_id: nil, likeable_type: nil, user_id: 1)
+  end
+
+  def test_custom_column_name_is_used_when_given_a_symbol
+    post = PostWithTally.create!(title: 'hello', reactions_tally: 0)
+    Reaction.create!(reactable_id: post.id, reactable_type: 'PostWithTally', score: 5)
+
+    assert_equal 1, post.reload.reactions_tally
+  end
+end