add :force option to cache!

README.md

@@ -240,7 +240,7 @@ Fragment caching is supported, it uses `Rails.cache` and works like caching in
 HTML templates:
 
 ```ruby
-json.cache! ['v1', @person], expires_in: 10.minutes do
+json.cache! ['v1', @person], expires_in: 10.minutes, force: true do
   json.extract! @person, :name, :age
 end
 ```

gemfiles/.bundle/config

@@ -0,0 +1,2 @@
+---
+BUNDLE_RETRY: "1"

lib/jbuilder/jbuilder_template.rb

@@ -130,7 +130,8 @@ def _render_partial(options)
 
   def _cache_fragment_for(key, options, &block)
     key = _cache_key(key, options)
-    _read_fragment_cache(key, options) || _write_fragment_cache(key, options, &block)
+    force = options[:force].present?
+    (!force && _read_fragment_cache(key, options)) || _write_fragment_cache(key, options, &block)
   end
 
   def _read_fragment_cache(key, options = nil)

test/jbuilder_template_test.rb

@@ -158,6 +158,35 @@ class JbuilderTemplateTest < ActiveSupport::TestCase
     assert_equal "Miss", result["b"]
   end
 
+  test "fragment caching a JSON object with force option" do
+
+    render(<<-JBUILDER)
+      json.cache! "cachekey" do
+        json.test1 "Value"
+      end
+    JBUILDER
+
+    result = render(<<-JBUILDER)
+      json.cache! "cachekey", force: false do
+        json.test1 "New Value"
+      end
+    JBUILDER
+    assert_equal "Value", result["test1"]
+
+    result = render(<<-JBUILDER)
+      json.cache! "cachekey", force: true do
+        json.test1 "New Value"
+      end
+    JBUILDER
+    assert_equal "New Value", result["test1"]
+    result = render(<<-JBUILDER)
+      json.cache! "cachekey" do
+        json.test1 "Cache Miss"
+      end
+    JBUILDER
+    assert_equal "New Value", result["test1"]
+  end
+
   test "object fragment caching with expiry" do
     travel_to "2018-05-12 11:29:00 -0400"