ruby on rails - How-to conform to a max/min width/height -

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i using carrierwave (https://github.com/jnicklas/carrierwave). need make sure images conform maximum/minimum height , width? otherwise error should display.

should handled in uploader class or in model (possibly through custom validation method)?

you can validate image width/height on client side, not guarantee anything, because it's easy manipulate/circumvent.

for user friendliness: check on client side , give warning before uploading. data integrity, check on server side after upload.


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