You can access the dimensions either before uploading to Cloudinary or afterwards.
For accessing image dimensions after uploading, you can add to your model entity the following code for processing metadata returned by Cloudinary. Please make sure after_save is placed after the mount_uploader definition.
after_save :update_dimensions
def update_dimensions
if self.picture.present? && self.picture.metadata.present?
width = self.picture.metadata["width"]
height = self.picture.metadata["height"]
# TODO: Update model entity
end
end
If you need to perform calculations on your side before uploading, you can use a code like the following one in your uploader class:
class ImageUploader < CarrierWave::Uploader::Base
include Cloudinary::CarrierWave
process :set_width_height
def set_width_height
img = ::MiniMagick::Image::read(File.binread(@file.file))
width = img[:width]
height = img[:height]
# TODO: Perform your calculations instead of assignments
new_width = width
new_height = height
return { :crop=>:fill, :width => new_width, :height=>new_height }
end
end
Comments
4 comments
doesn't work.
NoMethodError: undefined method `[]' for nil:NilClass
Hi Nicholas,
We'll need some more information about this.
You're more than welcomed to open a ticket and share your code with us, so we'll be able to further assist with this issue.
Hello,
i would love to be able to use this solution,
but none of the two code examples work for us in our Rails 3.2 project.
could i ask for any help?
i am happy to share code, too
Here's a basic sample project demonstrating this (on Rails 4):
https://github.com/taragano/Rails_retrieve_image_data
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