RE: Problem using rmagick in model class


#1

Move the ‘require_gem “rmagick”’ line outside the class definition for
Registrant

require_gem ‘rmagick’
class Registrant < ActiveRecord::Base


From: David R. [mailto:removed_email_address@domain.invalid]
Sent: Monday, December 12, 2005 10:04 AM
To: removed_email_address@domain.invalid
Subject: [Rails] Problem using rmagick in model class

I’m refactoring some code in order to conform to “the right way” of
doing things. That is, I’m moving my image-saving code from my
controller to my model. What worked fine in the controller class is not
working in the model class.

Currently, my code looks somewhat like this:
##############
class RegistrantsController < ApplicationController
def upload_image
@registrant = Registrant.find(session[:registrant_id])
if request.post?
if(params[:crop_params])
@registrant.save_image(params[:image_to_crop],
params[:crop_params])
redirect_to :action => :index
else
@registrant.image = params[:registrant][:image]
File.chmod(0644, @registrant.image)
end
end
end
end

class Registrant < ActiveRecord::Base
require_gem ‘rmagick’

def save_image(image_to_crop, crop_params)

img_base = RAILS_ROOT + "/public/images/registrants/"
img_file =  self.id.to_s + ".jpg"
y, x, w, h = crop_params.split(',')

img = Magick::ImageList.new(image_to_crop) # this is throwing

“uninitialized constant ImageList”

img.crop!(x.to_i, y.to_i, w.to_i, h.to_i)
img.resize!(120, 120)
color_thumb = img.resize(32, 32)
grey_img = img.quantize(256, Magick::GRAYColorspace)
img.write(img_path + img_filename)
grey_img.write(img_base + 'greyscale/' + img_filename)
color_thumb.write(img_base + 'thumbnail/' + img_filename)

end
end
##############

Note the comment in there (# this is throwing “uninitialized constant
ImageList”)

Can anyone see what I’ve done wrong, or otherwise help out?

Thanks,
David R.


#2

Doh.

So, it might be helpful if I understood why my previous code, where all
of
this was in the controller, worked fine, even when the require_gem
statement
was called within a class method. The controller method looked like
this:

def upload_image(*some_args)
require_gem ‘rmagick’
#do stuff with Magick::ImageList
end

On 12/12/05, Tom F. removed_email_address@domain.invalid wrote:

if request.post?

end
img = Magick::ImageList.new(image_to_crop) # this is throwing
end


Rails mailing list
removed_email_address@domain.invalid
http://lists.rubyonrails.org/mailman/listinfo/rails


David R.
Webmaster, SXSW Conferences and Festivals
SXSW 2005 - March 11-20, 2005 - Austin, Texas
http://sxsw.com/