Working With Rails

With Blob Columns

== this will generate methods for a custom module which will then be ‘included’ by the class. e.g.

class Artwork < ActiveRecord::Base
  with_blob_columns :original, :thumbnail
end

1. methods ‘original=’ and ‘thumbnail=’ will be generated for a module called Artwork::WithBlobColumns

2. Artwork will include Artwork::WithBlobColumns hence all instances will have the 2 methods, e.g.

art = Artwork.new art.original = open(“file_big.jpg”)

1. art.original will now return the binary of “file_big.jpg” whereas
2. art.original_mime (if the attribute exists) will return ‘image/jpeg’

note: file uploaded by browser can be set the same way:

assuming <input name="artwork[original]" type="file" />
art.original = params:artwork

note: if an empty file or non-file is given, the attribute value won’t be altered this is to facilitate “Edit” forms where users usually leave the file field blank. To nullify the field, access it directly:

art[:original] = nil

NOTE: This description has been extracted from the Plugin README and so the formatting may need updating to make browser friendly