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-rw-r--r--activesupport/lib/active_support/cache/memory_store.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/cache/memory_store.rb b/activesupport/lib/active_support/cache/memory_store.rb
index b15bb42c88..7fd5e3b53d 100644
--- a/activesupport/lib/active_support/cache/memory_store.rb
+++ b/activesupport/lib/active_support/cache/memory_store.rb
@@ -137,6 +137,7 @@ module ActiveSupport
def write_entry(key, entry, options) # :nodoc:
synchronize do
old_entry = @data[key]
+ return false if @data.key?(key) && options[:unless_exist]
@cache_size -= old_entry.size if old_entry
@cache_size += entry.size
@key_access[key] = Time.now.to_f