has_barcode
<img src=“https://secure.travis-ci.org/dpickett/has_barcode.png” />
A nice wrapper for Barcode generation using barby.
class Product
include HasBarcode
:barcode,
:outputter => :png,
:type => :code_39,
:value => Proc.new { |p| p.number }
def number
self.id
end
end
Product.new. # => Barby::Code39 object
Product.new. # => <Barby::Code39 object>.to_png
You can also pass the Barby barcode type directly like:
require 'barby/barcode/code_39'
class Product
include HasBarcode
:barcode,
:outputter => :png,
:type => Barby::Code39,
:value => Proc.new { |p| p.number }
end
Why has_barcode is a good choice for Heroku
Other libraries – such as barcode_generator – commonly rely on gbarcode, a GNU Barcode C library. This is problem since you need to install GNU barcode which Heroku does not support. Luckily has_barcode
doesn’t have this dependency.
A typical Heroku setup might look like:
class Coupon < ActiveRecord::Base
include HasBarcode
:barcode,
:outputter => :svg,
:type => :code_39,
:value => Proc.new { |c| c.id }
end
Notice we’re using the svg
outputter. This is good choice since it doesn’t need to store images in the file system, which can be an issue given Heroku’s read only file system.
To display your barcode in the view, do something like:
@coupon..html_safe
Note on Patches/Pull Requests
-
Fork the project.
-
Make your feature addition or bug fix.
-
Add tests for it. This is important so I don’t break it in a future version unintentionally.
-
Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but
bump version in a commit by itself I can ignore when I pull)
-
Send me a pull request. Bonus points for topic branches.
Copyright
Copyright © 2009 Dan Pickett. See LICENSE for details.