覆盖Rails中的gem方法

Question

I want to let users add interests -TV shows in this case-, and to make sure they type a correct tv show, I'm going to search imdb first and let them select one of the returning titles.

I found this gem https://github.com/ariejan/imdb which is doing almost what I need. If I search for "The vampire diaries", it will return it and 200 extra matches.

I went through the gem and I found that he does the querying part here https://github.com/ariejan/imdb/blob/master/lib/imdb/search.rb .

   def self.query(query)
      open("http://akas.imdb.com/find?q=#{CGI.escape(query)};s=tt")
   end

That query basically uses this link http://akas.imdb.com/find?q= and returns everything that can find given the input - movies, tv shows, episodes. Now I found a more advanced query which uses type and some other params. So I could actually return only 4 results in that case instead of 250. All I have to do is to replace that query with http://www.imdb.com/search/title?title=The%20Vampire%20Diaries&title_type=tv_series .

How do I override that search method?

Answer 1

You can use class_eval and put it in a decorators folder

app/decorators/imdb/search_decorator.rb

class Imdb::Search.class_eval do
  def self.query(query)
  end
end

Answer 2

You can re-open the class to override the method:

class Imdb::Search
  def self.query(query)
    # your custom logic here
  end
end

Note that you can call super(query) in your version to get the result of the original.