Calling a helper method from a route in Sinatra - ruby

Question

I've set up a simple Sinatra app based on this excellent SO answer. My code is working and looks like this:
# app.rb
require 'sinatra'
class MyApp < Sinatra::Application
set :public_folder, Proc.new { File.join(root, "app/public") }
set :views, Proc.new { File.join(root, "app/views") }
register Sinatra::Namespace
register Sinatra::Flash
enable :sessions
end
require_relative 'app/helpers/init'
require_relative 'app/models/init'
require_relative 'app/routes/init'
Then I have a dirty image uploader in a helper, which is being required in app/helpers/init.rb
# app/helpers/image.rb
require 'imgur'
module ImageUploader
def save(image)
#filename = image[:filename]
file = image[:tempfile]
File.open("#{ENV['PHOTO_TMP_DIR']}/#{#filename}", 'wb') do |f|
f.write(file.read)
upload(#filename)
end
end
def upload(filename)
client = Imgur.new(ENV['IMGUR_CLIENT_ID'])
image = Imgur::LocalImage.new("#{ENV['PHOTO_TMP_DIR']}/#{#filename}")
uploaded = client.upload(image)
File.delete("#{ENV['PHOTO_TMP_DIR']}/#{#filename}")
uploaded.link
end
end
And I'm successfully calling the save method in my app/routes/admin.rb file, like so:
# app/routes/admin.rb
class MyApp < Sinatra::Application
...
imgur_url = save(params[:image])
...
end
The problem is that save method name is so generic. I've tried calling with ImageUploader::save and ImageUploader.save, but they both throw errors. Is there another way I can call this helper method and have it namespaced to the helper module?
I should note that I'm loading the helper method like this:
# app/helpers/init.rb
require_relative 'image'
MyApp.helpers ImageUploader

Answer 1

Figured it out! To namespace the module methods, put self in front of the method name. Now doing:
# app/helpers/image.rb
require 'imgur'
module ImageUploader
def self.save(image)
#filename = image[:filename]
file = image[:tempfile]
File.open("#{ENV['PHOTO_TMP_DIR']}/#{#filename}", 'wb') do |f|
f.write(file.read)
upload(#filename)
end
end
def self.upload(filename)
client = Imgur.new(ENV['IMGUR_CLIENT_ID'])
image = Imgur::LocalImage.new("#{ENV['PHOTO_TMP_DIR']}/#{#filename}")
uploaded = client.upload(image)
File.delete("#{ENV['PHOTO_TMP_DIR']}/#{#filename}")
uploaded.link
end
end
Allows me to call ImageUploader.save without any errors.