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This is an abstract base class for analyzers, which extract metadata from blobs. See ActiveStorage::Analyzer::ImageAnalyzer for an example of a concrete subclass.

Namespace
Methods
A
D
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M
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T
Attributes
[R] blob
Class Public methods
accept?(blob)

Implement this method in a concrete subclass. Have it return true when given a blob from which the analyzer can extract metadata.

# File activestorage/lib/active_storage/analyzer.rb, line 11
def self.accept?(blob)
  false
end
new(blob)
# File activestorage/lib/active_storage/analyzer.rb, line 15
def initialize(blob)
  @blob = blob
end
Instance Public methods
metadata()

Override this method in a concrete subclass. Have it return a Hash of metadata.

# File activestorage/lib/active_storage/analyzer.rb, line 20
def metadata
  raise NotImplementedError
end
Instance Private methods
download_blob_to_tempfile(&block)

Downloads the blob to a tempfile on disk. Yields the tempfile.

# File activestorage/lib/active_storage/analyzer.rb, line 26
def download_blob_to_tempfile(&block) #:doc:
  blob.open tempdir: tempdir, &block
end
logger()
# File activestorage/lib/active_storage/analyzer.rb, line 30
def logger #:doc:
  ActiveStorage.logger
end
tempdir()
# File activestorage/lib/active_storage/analyzer.rb, line 34
def tempdir #:doc:
  Dir.tmpdir
end