Implement Alba.without_cache

lib/alba.rb

@@ -12,7 +12,7 @@ class Error < StandardError; end
   class UnsupportedBackend < Error; end
 
   class << self
-    attr_reader :backend, :encoder, :cache
+    attr_reader :backend, :encoder, :cache, :cache_store
     attr_accessor :default_serializer
 
     # Set the backend, which actually serializes object into JSON
@@ -31,6 +31,7 @@ def backend=(backend)
     # @params [Symbol] cache_store
     # @raise [Alba::Error] if active_support is not installed or given cache_store is not supported
     def cache_store=(cache_store = nil)
+      @cache_store = cache_store
       @cache = NullCacheStore.new and return if cache_store.nil?
 
       begin
@@ -66,6 +67,19 @@ def serialize(object, with: nil, &block)
       resource.serialize(with: with)
     end
 
+    # Low level API to disable cache temporarily.
+    #
+    # @params [Block]
+    def without_cache(&block)
+      original_cache_store = Alba.cache_store
+      raise ArgumentError, 'Block is required' unless block
+
+      Alba.cache_store = nil
+      yield
+    ensure
+      Alba.cache_store = original_cache_store
+    end
+
     private
 
     def set_encoder

test/usecases/cache_test.rb

@@ -45,6 +45,13 @@ def test_it_works_correctly_with_object_without_update_at_change
     refute_equal before_update_result, after_update_result
   end
 
+  def test_without_cache
+    Alba.without_cache do
+      assert_equal Alba::NullCacheStore, Alba.cache.class
+    end
+    assert_equal ActiveSupport::Cache::MemoryStore, Alba.cache.class
+  end
+
   def teardown
     Alba.cache_store = nil
   end