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I'm trying to download all of our information off of a really lousy cloud server. The files are images and PDFs. My problem is that I don't know how to write the blob data that I receive from the read_object call I do via this cloud API out to a file on my local filesystem.
I know that I could use ImageMagick/RMagick to create an image from the blob, but I would rather just skip this step and write the data directly to a file. I don't want to have to worry about having ImageMagick compiled with every single decode delegate ever.
I don't really see much information on Google for this, is this something that is just not done often with Ruby?
773
Files are Blobs, just tack on the meta properties and you're good to go. The default for a blob when uploading it is blob . So, I first extracted the name of the file I was cropping and then gave the same filename so the cropped file while uploading it to server by doing form. append("blob",blob, filename); .
BLOB stands for a “Binary Large Object,” a data type that stores binary data. Binary Large Objects (BLOBs) can be complex files like images or videos, unlike other data strings that only store letters and numbers. A BLOB will hold multimedia objects to add to a database; however, not all databases support BLOB storage.
Class ActiveStorage::Blob < ActiveRecord::Base. A blob is a record that contains the metadata about a file and a key for where that file resides on the service. Blobs can be created in two ways: Subsequent to the file being uploaded server-side to the service via create_after_upload! .
Assuming the file doesn't exist or you want to overwrite its current content, you just need to open the file with mode wb (w for write, b for binary — the b may not be strictly necessary on all systems). If you're trying to append to a file, use ab instead. See this page for more information on modes.
File.open(filename, 'wb') do |f|
f.write blob
end
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