From ee4017dda9b8bba67297bce6768218fb33602f58 Mon Sep 17 00:00:00 2001
From: Lucas <lucas.hosseini@gmail.com>
Date: Tue, 12 Sep 2017 16:13:35 +0200
Subject: [PATCH 1/2] Add cache configuration/hook.

---
 .../jsonapi/initializer/templates/initializer.rb       | 10 ++++++++++
 lib/jsonapi/rails/configuration.rb                     |  3 +++
 lib/jsonapi/rails/controller.rb                        |  6 ++++++
 lib/jsonapi/rails/renderer.rb                          |  1 +
 4 files changed, 20 insertions(+)

diff --git a/lib/generators/jsonapi/initializer/templates/initializer.rb b/lib/generators/jsonapi/initializer/templates/initializer.rb
index 720f29b..2bf9117 100644
--- a/lib/generators/jsonapi/initializer/templates/initializer.rb
+++ b/lib/generators/jsonapi/initializer/templates/initializer.rb
@@ -21,6 +21,16 @@
   #   version: '1.0'
   # }
   #
+  # # Set default cache.
+  # # A lambda/proc that will be eval'd in the controller context.
+  # config.jsonapi_cache = ->() { nil }
+  #
+  # # Uncomment the following to enable fragment caching. Make sure you
+  # #   invalidate cache keys accordingly.
+  # config.jsonapi_cache = lambda {
+  #   Rails.cache
+  # }
+  #
   # # Set default exposures.
   # # A lambda/proc that will be eval'd in the controller context.
   # config.jsonapi_expose = lambda {
diff --git a/lib/jsonapi/rails/configuration.rb b/lib/jsonapi/rails/configuration.rb
index 70e0945..e5690e9 100644
--- a/lib/jsonapi/rails/configuration.rb
+++ b/lib/jsonapi/rails/configuration.rb
@@ -23,6 +23,8 @@ module Configurable
         version: '1.0'
       }.freeze
 
+      DEFAULT_JSONAPI_CACHE = ->() { nil }
+
       DEFAULT_JSONAPI_EXPOSE = lambda {
         { url_helpers: ::Rails.application.routes.url_helpers }
       }
@@ -38,6 +40,7 @@ module Configurable
       DEFAULT_CONFIG = {
         jsonapi_class: DEFAULT_JSONAPI_CLASS,
         jsonapi_errors_class: DEFAULT_JSONAPI_ERRORS_CLASS,
+        jsonapi_cache:   DEFAULT_JSONAPI_CACHE,
         jsonapi_expose:  DEFAULT_JSONAPI_EXPOSE,
         jsonapi_fields:  DEFAULT_JSONAPI_FIELDS,
         jsonapi_include: DEFAULT_JSONAPI_INCLUDE,
diff --git a/lib/jsonapi/rails/controller.rb b/lib/jsonapi/rails/controller.rb
index 27c9b3d..f4a172d 100644
--- a/lib/jsonapi/rails/controller.rb
+++ b/lib/jsonapi/rails/controller.rb
@@ -110,6 +110,12 @@ def jsonapi_expose
         instance_exec(&JSONAPI::Rails.config[:jsonapi_expose])
       end
 
+      # Hook for default cache.
+      # @return [#fetch_multi]
+      def jsonapi_cache
+        instance_exec(&JSONAPI::Rails.config[:jsonapi_cache])
+      end
+
       # Hook for default fields.
       # @return [Hash{Symbol=>Array<Symbol>}]
       def jsonapi_fields
diff --git a/lib/jsonapi/rails/renderer.rb b/lib/jsonapi/rails/renderer.rb
index 6fc0b6d..423164d 100644
--- a/lib/jsonapi/rails/renderer.rb
+++ b/lib/jsonapi/rails/renderer.rb
@@ -22,6 +22,7 @@ def render(resources, options, controller)
       def default_options(options, controller, resources)
         options.dup.tap do |opts|
           opts[:class] ||= controller.jsonapi_class
+          opts[:cache] ||= controller.jsonapi_cache
           opts[:links] =
             controller.jsonapi_links
                       .merge!(controller.jsonapi_pagination(resources))

From 963304e3e8580a62182ec9a6a22faeef062d0585 Mon Sep 17 00:00:00 2001
From: Lucas <lucas.hosseini@gmail.com>
Date: Tue, 12 Sep 2017 16:14:07 +0200
Subject: [PATCH 2/2] [skip ci] changelog

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f422a29..08553be 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 ### Added
 
+* Default configuration and hooks for the `cache` parameter.
 * Default configuration and hooks for the `links` parameter.
 * Default configuration and hooks for the `fields` parameter.
 * Default configuration and hooks for the `include` parameter.