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-rw-r--r--activestorage/app/models/active_storage/blob.rb10
1 files changed, 10 insertions, 0 deletions
diff --git a/activestorage/app/models/active_storage/blob.rb b/activestorage/app/models/active_storage/blob.rb
index d36c951292..203e4118c5 100644
--- a/activestorage/app/models/active_storage/blob.rb
+++ b/activestorage/app/models/active_storage/blob.rb
@@ -168,6 +168,16 @@ class ActiveStorage::Blob < ActiveRecord::Base
# Downloads the blob to a tempfile on disk. Yields the tempfile.
#
+ # The tempfile's name is prefixed with +ActiveStorage-+ and the blob's ID. Its extension matches that of the blob.
+ #
+ # By default, the tempfile is created in <tt>Dir.tmpdir</tt>. Pass +tempdir:+ to create it in a different directory:
+ #
+ # blob.open(tempdir: "/path/to/tmp") do |file|
+ # # ...
+ # end
+ #
+ # The tempfile is automatically closed and unlinked after the given block is executed.
+ #
# Raises ActiveStorage::IntegrityError if the downloaded data does not match the blob's checksum.
def open(tempdir: nil, &block)
ActiveStorage::Downloader.new(self, tempdir: tempdir).download_blob_to_tempfile(&block)