Ruby class to fetch suggested keywords
August 4th, 2008 | by Sajal Kayan |I have recently ditched Perl and fell for Ruby.
Here is a Ruby class which gets suggested keywords from yahoo API and presents it in a comma separated list. This might be useful for people who use Ruby to upload/edit multiple posts and need to tag them automagically.
This might be awfully simple for the hardcore guys, but for a noob like me, had I come across this example earlier it would have saved me an hour or so. Here it goes…
The Class :-
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# A ruby class to fetch suggested keywords using Yahoo’s term Extraction API
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require ‘rubygems’
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require ‘xmlsimple’
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require ‘net/http’
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class Tagger
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def content
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@content
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end
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def content=(content)
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@content = content
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end
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def appid
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@appid
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end
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def appid=(appid)
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@appid = appid
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end
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def initialize
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end
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def fetch
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url = URI.parse(‘http://search.yahooapis.com/ContentAnalysisService/V1/termExtraction’)
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post_args = {
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‘appid’ => appid,
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‘context’ => content,
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‘output’ => "xml"
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}
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resp1, xml_data = Net::HTTP.post_form(url, post_args)
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keywords = ""
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data = XmlSimple.xml_in(xml_data)
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data[‘Result’].each do |item|
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keywords = keywords + item + ", "
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end
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return keywords
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end
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end
Download the class here
Sample usage :
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require ‘tagger’
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tagg = Tagger.new
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tagg.appid = ‘GO_GET_YOUR_OWN!’
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tagg.content = "The content of the post….."
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puts tagg.fetch
The appid is available from the Yahoo Developer Network
Limitations : Maximum 5000 queries per day per IP.
2 Responses to “Ruby class to fetch suggested keywords”
By Martin DeMello on Aug 15, 2008 | Reply
Ruby can autogenerate your getters and setters for you:
class Tagger
attr_accessor :content, :app_id
Also, there is no need for an empty initialize method - just leave it out if you aren’t doing any initialization.
Check out the String#join method too:
keywords = data.join(”, “)
doesn’t have the problem of an extraneous “,” after the last element.
By Brian Cardarella on Aug 15, 2008 | Reply
Instead of writing out the content/content= and appid/appid= methods Ruby has a cool shortcut:
attr_accessor :content, :appid
It will define the getter and setter methods as well as the instance variable at runtime, quicker than writing out that repetitive code.