Not recognized by the 'identify' command error while using validates_each

Below is my validations for image content type which works fine.

validates_attachment_size :icon, :less_than => MAX_SIZE.megabytes, :message => "Max size is 1 mb"
validates_attachment_content_type :icon, :content_type => ['image/jpg','image/jpeg', 'image/png', 'image/gif']

BUT

I need to validate the dimensions also and my code is

validates_each :icon do |record, attr, value|
    if record.icon_file_name
       dimensions = Paperclip::Geometry.from_file(value.queued_for_write[:original])
       if(dimensions.width > 600 || dimensions.height > 400)
         record.errors.add(:file, " #{record.i开发者_开发知识库con_file_name} dimensions must be less than or equal to 600*400")
       end
     end
   end

AND

it gives imagemagick error Not recognized by the 'identify' command error

Can you put some light on this?

Thanks.

---

How about using "validate" method instead of "validates_each" http://paulsturgess.co.uk/articles/33-how-to-write-custom-validation-in-ruby-on-rails

---

Looks like you do not have ImageMagick installed on your machine. If you do, type

which identify

and add the path as value to the following paperclip option in environment.rb

Paperclip.options[:command_path] = "/usr/local/bin/" #assuming this folder

Let know how it goes..

---

Finally, did with the help of yours input.

validate :icon_dimensions

def icon_dimensions
  unless icon.to_file.nil?
    dimensions = Paperclip::Geometry.from_file(icon.to_file(:original))
    if(dimensions.width > 72 || dimensions.height > 72)
      errors.add(:icon, " dimensions must be less than or equal to 72*72")
    end
  end
end

I hope the validates_each executed before or override the other validations. Not sure :(