[Rails] How to create thumbnail

Hi all
I want to create thumbnail for a uploaded image file, I have a
product controller and model with a image field .I want file uploaded
in the image field should have one thumbnail file and also one
general. I have tried a lot by installing plugins for thumbnails but
they are not working rendering errors like PLUGIN not found..

Please , give me some suggestions where I will create which
controller and action to create a thumbnail....

Thanks in advance..

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