How to crop image on upload with Rails, Carrierwave and Minimagick?

Question

I have read:

• Undefined Method crop! Using Carrierwave with MiniMagick on rails 3.1.3
• Carrierwave Cropping
• http://pastebin.com/ue4mVbC8

Answer 1

In #cropper your crop_h is not initialized(you double initialize crop_y instead). In #crop error is exactly what error message said - you don't have defined crop_x for Project class.

Answer 2

I have understood.

  version :thumb do    
    process resize_to_fit: [300, nil]
    process crop: '300x150+0+0'
    #process resize_and_crop: 200
  end

private

  # Simplest way
  def crop(geometry)
    manipulate! do |img|      
      img.crop(geometry)
      img
    end    
  end

  # Resize and crop square from Center
  def resize_and_crop(size)  
    manipulate! do |image|                 
      if image[:width] < image[:height]
        remove = ((image[:height] - image[:width])/2).round 
        image.shave("0x#{remove}") 
      elsif image[:width] > image[:height] 
        remove = ((image[:width] - image[:height])/2).round
        image.shave("#{remove}x0")
      end
      image.resize("#{size}x#{size}")
      image
    end
  end

resize_and_crop from here:

http://blog.aclarke.eu/crop-and-resize-an-image-using-minimagick/