4 files changed, 16 insertions, 17 deletions
diff --git a/activestorage/lib/active_storage.rb b/activestorage/lib/active_storage.rb
index cfdb2a8acd..d1ff6b7032 100644
--- a/activestorage/lib/active_storage.rb
+++ b/activestorage/lib/active_storage.rb
@@ -38,6 +38,7 @@ module ActiveStorage
 
   mattr_accessor :logger
   mattr_accessor :verifier
+  mattr_accessor :queue
   mattr_accessor :previewers, default: []
   mattr_accessor :analyzers, default: []
 end
diff --git a/activestorage/lib/active_storage/downloading.rb b/activestorage/lib/active_storage/downloading.rb
index ceb7cce0c7..3dac6b116a 100644
--- a/activestorage/lib/active_storage/downloading.rb
+++ b/activestorage/lib/active_storage/downloading.rb
@@ -3,9 +3,9 @@
 module ActiveStorage
   module Downloading
     private
-      # Opens a new tempfile and copies blob data into it. Yields the tempfile.
+      # Opens a new tempfile in #tempdir and copies blob data into it. Yields the tempfile.
       def download_blob_to_tempfile # :doc:
-        Tempfile.open("ActiveStorage") do |file|
+        Tempfile.open("ActiveStorage", tempdir) do |file|
           download_blob_to file
           yield file
         end
@@ -17,5 +17,10 @@ module ActiveStorage
         blob.download { |chunk| file.write(chunk) }
         file.rewind
       end
+
+      # Returns the directory in which tempfiles should be opened. Defaults to +Dir.tmpdir+.
+      def tempdir # :doc:
+        Dir.tmpdir
+      end
   end
 end
diff --git a/activestorage/lib/active_storage/engine.rb b/activestorage/lib/active_storage/engine.rb
index a01a14cd83..6cf6635c4f 100644
--- a/activestorage/lib/active_storage/engine.rb
+++ b/activestorage/lib/active_storage/engine.rb
@@ -19,9 +19,12 @@ module ActiveStorage
 
     config.eager_load_namespaces << ActiveStorage
 
-    initializer "active_storage.logger" do
+    initializer "active_storage.configs" do
       config.after_initialize do |app|
-        ActiveStorage.logger = app.config.active_storage.logger || Rails.logger
+        ActiveStorage.logger     = app.config.active_storage.logger || Rails.logger
+        ActiveStorage.queue      = app.config.active_storage.queue
+        ActiveStorage.previewers = app.config.active_storage.previewers || []
+        ActiveStorage.analyzers  = app.config.active_storage.analyzers || []
       end
     end
 
@@ -65,17 +68,5 @@ module ActiveStorage
         end
       end
     end
-
-    initializer "active_storage.previewers" do
-      config.after_initialize do |app|
-        ActiveStorage.previewers = app.config.active_storage.previewers || []
-      end
-    end
-
-    initializer "active_storage.analyzers" do
-      config.after_initialize do |app|
-        ActiveStorage.analyzers = app.config.active_storage.analyzers || []
-      end
-    end
   end
 end
diff --git a/activestorage/lib/active_storage/previewer.rb b/activestorage/lib/active_storage/previewer.rb
index 460f6d5678..ed75bae3b5 100644
--- a/activestorage/lib/active_storage/previewer.rb
+++ b/activestorage/lib/active_storage/previewer.rb
@@ -40,8 +40,10 @@ module ActiveStorage
       #       end
       #     end
       #   end
+      #
+      # The output tempfile is opened in the directory returned by ActiveStorage::Downloading#tempdir.
       def draw(*argv) # :doc:
-        Tempfile.open("ActiveStorage") do |file|
+        Tempfile.open("ActiveStorage", tempdir) do |file|
           capture(*argv, to: file)
           yield file
         end