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GitHub User: gamov
Great idea; works very well, is elegant and is set at the right places.
Cool but doesn't work if you mix new and existing records.
I love Ernie Miller's two main projects (Squeel & Ransack / previously metawhere & metasearch).
As much as Squeel cleans up DB look ups, I find Ransack totally brilliant, it makes standard (and you can go quite sophisticated) searches in indexes so easy and flexible!