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class ActiveStorage::Transformers::Transformer
Active Storage Transformers Transformer
A Transformer
applies a set of transformations to an image.
The following concrete subclasses are included in Active Storage:
ActiveStorage::Transformers::ImageProcessingTransformer
: backed by ImageProcessing, a common interface for MiniMagick and ruby-vips
Attributes
Public Class Methods
# File activestorage/lib/active_storage/transformers/transformer.rb, line 16
def initialize(transformations)
@transformations = transformations
end
Public Instance Methods
# File activestorage/lib/active_storage/transformers/transformer.rb, line 23
def transform(file, format:)
output = process(file, format: format)
begin
yield output
ensure
output.close!
end
end
Applies the transformations to the source image in file
, producing a target image in the specified format
. Yields an open Tempfile containing the target image. Closes and unlinks the output tempfile after yielding to the given block. Returns the result of the block.
Private Instance Methods
# File activestorage/lib/active_storage/transformers/transformer.rb, line 36
def process(file, format:) # :doc:
raise NotImplementedError
end
Returns an open Tempfile containing a transformed image in the given format
. All subclasses implement this method.
© 2004–2021 David Heinemeier Hansson
Licensed under the MIT License.