Switch to supports_cache_versioning? check to a class method

- Moving the `supports_cache_versioning?` check to a class method. 
- Shorten the method doc. 
- Expand on the error message.

5 files changed, 10 insertions, 20 deletions

diff --git a/activesupport/lib/active_support/cache/file_store.rb b/activesupport/lib/active_support/cache/file_store.rb
index b17f0a4a4a..53a2b07536 100644
--- a/activesupport/lib/active_support/cache/file_store.rb
+++ b/activesupport/lib/active_support/cache/file_store.rb
@@ -26,10 +26,8 @@ module ActiveSupport
         @cache_path = cache_path.to_s
       end
 
-      # Advertise that this cache store can be used
-      # with "recyclable cache keys" otherwise known
-      # as cache versioning.
-      def supports_in_cache_versioning?
+      # Advertise cache versioning support.
+      def self.supports_cache_versioning?
         true
       end
 
diff --git a/activesupport/lib/active_support/cache/mem_cache_store.rb b/activesupport/lib/active_support/cache/mem_cache_store.rb
index f235f05d6c..174c784deb 100644
--- a/activesupport/lib/active_support/cache/mem_cache_store.rb
+++ b/activesupport/lib/active_support/cache/mem_cache_store.rb
@@ -47,10 +47,8 @@ module ActiveSupport
           end
       end
 
-      # Advertise that this cache store can be used
-      # with "recyclable cache keys" otherwise known
-      # as cache versioning.
-      def supports_in_cache_versioning?
+      # Advertise cache versioning support.
+      def self.supports_cache_versioning?
         true
       end
 
diff --git a/activesupport/lib/active_support/cache/memory_store.rb b/activesupport/lib/active_support/cache/memory_store.rb
index 32530fa2a9..106b616529 100644
--- a/activesupport/lib/active_support/cache/memory_store.rb
+++ b/activesupport/lib/active_support/cache/memory_store.rb
@@ -30,10 +30,8 @@ module ActiveSupport
         @pruning = false
       end
 
-      # Advertise that this cache store can be used
-      # with "recyclable cache keys" otherwise known
-      # as cache versioning.
-      def supports_in_cache_versioning?
+      # Advertise cache versioning support.
+      def self.supports_cache_versioning?
         true
       end
 
diff --git a/activesupport/lib/active_support/cache/null_store.rb b/activesupport/lib/active_support/cache/null_store.rb
index 405d485671..8452a28fd8 100644
--- a/activesupport/lib/active_support/cache/null_store.rb
+++ b/activesupport/lib/active_support/cache/null_store.rb
@@ -12,10 +12,8 @@ module ActiveSupport
     class NullStore < Store
       prepend Strategy::LocalCache
 
-      # Advertise that this cache store can be used
-      # with "recyclable cache keys" otherwise known
-      # as cache versioning.
-      def supports_in_cache_versioning?
+      # Advertise cache versioning support.
+      def self.supports_cache_versioning?
         true
       end
 
diff --git a/activesupport/lib/active_support/cache/redis_cache_store.rb b/activesupport/lib/active_support/cache/redis_cache_store.rb
index 4cee774908..9a55e49e27 100644
--- a/activesupport/lib/active_support/cache/redis_cache_store.rb
+++ b/activesupport/lib/active_support/cache/redis_cache_store.rb
@@ -66,10 +66,8 @@ module ActiveSupport
       SCAN_BATCH_SIZE = 1000
       private_constant :SCAN_BATCH_SIZE
 
-      # Advertise that this cache store can be used
-      # with "recyclable cache keys" otherwise known
-      # as cache versioning.
-      def supports_in_cache_versioning?
+      # Advertise cache versioning support.
+      def self.supports_cache_versioning?
         true
       end