RMagic Error in rails, with AM Charts
- by Elliot
Hi Everyone,
I'm using AMCharts and rails. AMCharts uses the Image Magic lib to export an image of the chart. In rails this is done with the gem, RMagic.
In a controller this is implemented with the following controller method:
def export
width = params[:width].to_i
height = params[:height].to_i
data = {}
img = Magick::Image.new(width, height)
height.times do |y|
row = params["r#{y}"].split(',')
row.size.times do |r|
pixel = row[r].to_s.split(':')
pixel[0] = pixel[0].to_s.rjust(6, '0')
if pixel.size == 2
pixel[1].to_i.times do
(data[y] ||= []) << pixel[0]
end
else
(data[y] ||= []) << pixel[0]
end
end
width.times do |x|
img.pixel_color(x, y, "##{data[y][x]}")
end
end
img.format = "PNG"
send_data(img.to_blob , :disposition => 'inline', :type => 'image/png', :filename => "chart.png?#{rand(99999999).to_i}")
end
When the controller is accessed however, I receive this error in the page:
The change you wanted was rejected.
Maybe you tried to change something you didn't have access to.
And this error in the logs (its running on heroku btw):
ActionController::InvalidAuthenticityToken (ActionController::InvalidAuthenticityToken):
/home/heroku_rack/lib/static_assets.rb:9:in `call'
/home/heroku_rack/lib/last_access.rb:25:in `call'
/home/heroku_rack/lib/date_header.rb:14:in `call'
thin (1.0.1) lib/thin/connection.rb:80:in `pre_process'
thin (1.0.1) lib/thin/connection.rb:78:in `catch'
thin (1.0.1) lib/thin/connection.rb:78:in `pre_process'
thin (1.0.1) lib/thin/connection.rb:57:in `process'
thin (1.0.1) lib/thin/connection.rb:42:in `receive_data'
eventmachine (0.12.6) lib/eventmachine.rb:240:in `run_machine'
eventmachine (0.12.6) lib/eventmachine.rb:240:in `run'
thin (1.0.1) lib/thin/backends/base.rb:57:in `start'
thin (1.0.1) lib/thin/server.rb:150:in `start'
thin (1.0.1) lib/thin/controllers/controller.rb:80:in `start'
thin (1.0.1) lib/thin/runner.rb:173:in `send'
thin (1.0.1) lib/thin/runner.rb:173:in `run_command'
thin (1.0.1) lib/thin/runner.rb:139:in `run!'
thin (1.0.1) bin/thin:6
/usr/local/bin/thin:20:in `load'
/usr/local/bin/thin:20
Rendering /disk1/home/slugs/149903_609c236_eb4f/mnt/public/422.html (422 Unprocessable Entity)
Anyone have any idea what's going on here?
