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Merge pull request #38866 from abhaynikam/fix-active-storage-previewer-doc 

Updated Active Storage configuration guide for previewers default values [ci skip]
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Eugene Kenny 2020-04-06 07:57:42 +01:00 committed by GitHub
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9
activestorage/app/models/active_storage/preview.rb
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@ -3,8 +3,9 @@
# Some non-image blobs can be previewed: that is, they can be presented as images. A video blob can be previewed by
# extracting its first frame, and a PDF blob can be previewed by extracting its first page.
#
# A previewer extracts a preview image from a blob. Active Storage provides previewers for videos and PDFs:
# ActiveStorage::Previewer::VideoPreviewer and ActiveStorage::Previewer::PDFPreviewer. Build custom previewers by
# A previewer extracts a preview image from a blob. Active Storage provides previewers for videos and PDFs.
# ActiveStorage::Previewer::VideoPreviewer is used for videos whereas ActiveStorage::Previewer::PopplerPDFPreviewer
# and ActiveStorage::Previewer::MuPDFPreviewer are used for PDFs. Build custom previewers by
# subclassing ActiveStorage::Previewer and implementing the requisite methods. Consult the ActiveStorage::Previewer
# documentation for more details on what's required of previewers.
#
@ -13,11 +14,11 @@
# by manipulating +Rails.application.config.active_storage.previewers+ in an initializer:
#
# Rails.application.config.active_storage.previewers
# # => [ ActiveStorage::Previewer::PDFPreviewer, ActiveStorage::Previewer::VideoPreviewer ]
# # => [ ActiveStorage::Previewer::PopplerPDFPreviewer, ActiveStorage::Previewer::MuPDFPreviewer, ActiveStorage::Previewer::VideoPreviewer ]
#
# # Add a custom previewer for Microsoft Office documents:
# Rails.application.config.active_storage.previewers << DOCXPreviewer
# # => [ ActiveStorage::Previewer::PDFPreviewer, ActiveStorage::Previewer::VideoPreviewer, DOCXPreviewer ]
# # => [ ActiveStorage::Previewer::PopplerPDFPreviewer, ActiveStorage::Previewer::MuPDFPreviewer, ActiveStorage::Previewer::VideoPreviewer, DOCXPreviewer ]
#
# Outside of a Rails application, modify +ActiveStorage.previewers+ instead.
#

2
guides/source/configuring.md
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@ -889,7 +889,7 @@ You can find more detailed configuration options in the
* `config.active_storage.analyzers` accepts an array of classes indicating the analyzers available for Active Storage blobs. The default is `[ActiveStorage::Analyzer::ImageAnalyzer, ActiveStorage::Analyzer::VideoAnalyzer]`. The former can extract width and height of an image blob; the latter can extract width, height, duration, angle, and aspect ratio of a video blob.
* `config.active_storage.previewers` accepts an array of classes indicating the image previewers available in Active Storage blobs. The default is `[ActiveStorage::Previewer::PDFPreviewer, ActiveStorage::Previewer::VideoPreviewer]`. The former can generate a thumbnail from the first page of a PDF blob; the latter from the relevant frame of a video blob.
* `config.active_storage.previewers` accepts an array of classes indicating the image previewers available in Active Storage blobs. The default is `[ActiveStorage::Previewer::PopplerPDFPreviewer, ActiveStorage::Previewer::MuPDFPreviewer, ActiveStorage::Previewer::VideoPreviewer]`. `PopplerPDFPreviewer` and `MuPDFPreviewer` can generate a thumbnail from the first page of a PDF blob; `VideoPreviewer` from the relevant frame of a video blob.
* `config.active_storage.paths` accepts a hash of options indicating the locations of previewer/analyzer commands. The default is `{}`, meaning the commands will be looked for in the default path. Can include any of these options:
* `:ffprobe` - The location of the ffprobe executable.