attachment_uploader.rb

class AttachmentUploader < CarrierWave::Uploader::Base
	include CarrierWave::RMagick
  storage :dropbox

  version :thumb do
  	process :crop
	  resize_to_fill(100, 100)
	end

	version :large do
	  resize_to_limit(600, 600)
	end

	def crop
    if model.crop_x.present?
      resize_to_limit(600, 600)
      manipulate! do |img|
        x = model.crop_x
        y = model.crop_y
        w = model.crop_w
        h = model.crop_h
        img.crop!(x, y, w, h)
      end
    end
  end
  
  def store_dir
    "prueba/#{model.user_login}_#{model.id}"
  end

end

crop.html.erb

<h1>Crop Avatar</h1>
<%= image_tag @observation.attachment_url, id: "cropbox" %>
<h4>Preview</h4>
<div style="width:100px; height:100px; overflow:hidden">
  <%= image_tag @observation.attachment_url, :id => "preview" %>
</div>
<%= form_for @observation do |f| %>
  <% %w[x y w h].each do |attribute| %>
    <%= f.text_field "crop_#{attribute}" %>
  <% end %>
  <div class="actions">
    <%= f.submit "Crop" %>
  </div>
<% end %>

full trace

NoMethodError in IssueObservationsController#update
undefined method `read' for #<CarrierWave::Storage::Dropbox::File:0x007ff74e6dd6c8>

Extracted source (around line #11):
9
10
11
12
13
              

  def crop_attachment
    attachment.recreate_versions! if crop_x.present?
  end
end

Rails.root: /home/lhdev1/Projects/unfortracker

Application Trace | Framework Trace | Full Trace
carrierwave (0.11.2) lib/carrierwave/uploader/cache.rb:89:in `sanitized_file'
carrierwave (0.11.2) lib/carrierwave/uploader/cache.rb:128:in `cache!'
carrierwave (0.11.2) lib/carrierwave/uploader/versions.rb:226:in `recreate_versions!'
app/models/issue_observation.rb:11:in `crop_attachment'
activesupport (5.0.2) lib/active_support/callbacks.rb:382:in `block in make_lambda'
activesupport (5.0.2) lib/active_support/callbacks.rb:207:in `call'
activesupport (5.0.2) lib/active_support/callbacks.rb:207:in `block in halting_and_conditional'
activesupport (5.0.2) lib/active_support/callbacks.rb:456:in `call'
activesupport (5.0.2) lib/active_support/callbacks.rb:456:in `block in call'
activesupport (5.0.2) lib/active_support/callbacks.rb:456:in `each'
activesupport (5.0.2) lib/active_support/callbacks.rb:456:in `call'
activesupport (5.0.2) lib/active_support/callbacks.rb:101:in `__run_callbacks__'
activesupport (5.0.2) lib/active_support/callbacks.rb:750:in `_run_update_callbacks'
activerecord (5.0.2) lib/active_record/callbacks.rb:306:in `_update_record'
activerecord (5.0.2) lib/active_record/timestamp.rb:81:in `_update_record'
activerecord (5.0.2) lib/active_record/persistence.rb:540:in `create_or_update'
activerecord (5.0.2) lib/active_record/callbacks.rb:298:in `block in create_or_update'
activesupport (5.0.2) lib/active_support/callbacks.rb:126:in `call'
activesupport (5.0.2) lib/active_support/callbacks.rb:126:in `call'
activesupport (5.0.2) lib/active_support/callbacks.rb:506:in `block (2 levels) in compile'
activesupport (5.0.2) lib/active_support/callbacks.rb:455:in `call'
activesupport (5.0.2) lib/active_support/callbacks.rb:455:in `call'
activesupport (5.0.2) lib/active_support/callbacks.rb:101:in `__run_callbacks__'
activesupport (5.0.2) lib/active_support/callbacks.rb:750:in `_run_save_callbacks'
activerecord (5.0.2) lib/active_record/callbacks.rb:298:in `create_or_update'
activerecord (5.0.2) lib/active_record/persistence.rb:125:in `save'
activerecord (5.0.2) lib/active_record/validations.rb:44:in `save'
activerecord (5.0.2) lib/active_record/attribute_methods/dirty.rb:22:in `save'
activerecord (5.0.2) lib/active_record/transactions.rb:319:in `block (2 levels) in save'
activerecord (5.0.2) lib/active_record/transactions.rb:395:in `block in with_transaction_returning_status'
activerecord (5.0.2) lib/active_record/connection_adapters/abstract/database_statements.rb:230:in `transaction'
activerecord (5.0.2) lib/active_record/transactions.rb:211:in `transaction'
activerecord (5.0.2) lib/active_record/transactions.rb:392:in `with_transaction_returning_status'
activerecord (5.0.2) lib/active_record/transactions.rb:319:in `block in save'
activerecord (5.0.2) lib/active_record/transactions.rb:334:in `rollback_active_record_state!'
activerecord (5.0.2) lib/active_record/transactions.rb:318:in `save'
activerecord (5.0.2) lib/active_record/suppressor.rb:41:in `save'
activerecord (5.0.2) lib/active_record/persistence.rb:267:in `block in update'
activerecord (5.0.2) lib/active_record/transactions.rb:395:in `block in with_transaction_returning_status'
activerecord (5.0.2) lib/active_record/connection_adapters/abstract/database_statements.rb:232:in `block in transaction'
activerecord (5.0.2) lib/active_record/connection_adapters/abstract/transaction.rb:189:in `within_new_transaction'
activerecord (5.0.2) lib/active_record/connection_adapters/abstract/database_statements.rb:232:in `transaction'
activerecord (5.0.2) lib/active_record/transactions.rb:211:in `transaction'
activerecord (5.0.2) lib/active_record/transactions.rb:392:in `with_transaction_returning_status'
activerecord (5.0.2) lib/active_record/persistence.rb:265:in `update'
app/controllers/issue_observations_controller.rb:13:in `update'
actionpack (5.0.2) lib/action_controller/metal/basic_implicit_render.rb:4:in `send_action'
actionpack (5.0.2) lib/abstract_controller/base.rb:188:in `process_action'
actionpack (5.0.2) lib/action_controller/metal/rendering.rb:30:in `process_action'
actionpack (5.0.2) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (5.0.2) lib/active_support/callbacks.rb:126:in `call'
activesupport (5.0.2) lib/active_support/callbacks.rb:126:in `call'
activesupport (5.0.2) lib/active_support/callbacks.rb:506:in `block (2 levels) in compile'
activesupport (5.0.2) lib/active_support/callbacks.rb:455:in `call'
activesupport (5.0.2) lib/active_support/callbacks.rb:455:in `call'
activesupport (5.0.2) lib/active_support/callbacks.rb:101:in `__run_callbacks__'
activesupport (5.0.2) lib/active_support/callbacks.rb:750:in `_run_process_action_callbacks'
activesupport (5.0.2) lib/active_support/callbacks.rb:90:in `run_callbacks'
actionpack (5.0.2) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (5.0.2) lib/action_controller/metal/rescue.rb:20:in `process_action'
actionpack (5.0.2) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
activesupport (5.0.2) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (5.0.2) lib/active_support/notifications/instrumenter.rb:21:in `instrument'
activesupport (5.0.2) lib/active_support/notifications.rb:164:in `instrument'
actionpack (5.0.2) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (5.0.2) lib/action_controller/metal/params_wrapper.rb:248:in `process_action'
activerecord (5.0.2) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (5.0.2) lib/abstract_controller/base.rb:126:in `process'
actionview (5.0.2) lib/action_view/rendering.rb:30:in `process'
actionpack (5.0.2) lib/action_controller/metal.rb:190:in `dispatch'
actionpack (5.0.2) lib/action_controller/metal.rb:262:in `dispatch'
actionpack (5.0.2) lib/action_dispatch/routing/route_set.rb:50:in `dispatch'
actionpack (5.0.2) lib/action_dispatch/routing/route_set.rb:32:in `serve'
actionpack (5.0.2) lib/action_dispatch/journey/router.rb:39:in `block in serve'
actionpack (5.0.2) lib/action_dispatch/journey/router.rb:26:in `each'
actionpack (5.0.2) lib/action_dispatch/journey/router.rb:26:in `serve'
actionpack (5.0.2) lib/action_dispatch/routing/route_set.rb:725:in `call'
rack-pjax (1.0.0) lib/rack/pjax.rb:12:in `call'
remotipart (1.3.1) lib/remotipart/middleware.rb:32:in `call'
rack (2.0.1) lib/rack/etag.rb:25:in `call'
rack (2.0.1) lib/rack/conditional_get.rb:38:in `call'
rack (2.0.1) lib/rack/head.rb:12:in `call'
rack (2.0.1) lib/rack/session/abstract/id.rb:222:in `context'
rack (2.0.1) lib/rack/session/abstract/id.rb:216:in `call'
actionpack (5.0.2) lib/action_dispatch/middleware/cookies.rb:613:in `call'
activerecord (5.0.2) lib/active_record/migration.rb:553:in `call'
actionpack (5.0.2) lib/action_dispatch/middleware/callbacks.rb:38:in `block in call'
activesupport (5.0.2) lib/active_support/callbacks.rb:97:in `__run_callbacks__'
activesupport (5.0.2) lib/active_support/callbacks.rb:750:in `_run_call_callbacks'
activesupport (5.0.2) lib/active_support/callbacks.rb:90:in `run_callbacks'
actionpack (5.0.2) lib/action_dispatch/middleware/callbacks.rb:36:in `call'
actionpack (5.0.2) lib/action_dispatch/middleware/executor.rb:12:in `call'
actionpack (5.0.2) lib/action_dispatch/middleware/remote_ip.rb:79:in `call'
actionpack (5.0.2) lib/action_dispatch/middleware/debug_exceptions.rb:49:in `call'
web-console (3.5.0) lib/web_console/middleware.rb:135:in `call_app'
web-console (3.5.0) lib/web_console/middleware.rb:28:in `block in call'
web-console (3.5.0) lib/web_console/middleware.rb:18:in `catch'
web-console (3.5.0) lib/web_console/middleware.rb:18:in `call'
actionpack (5.0.2) lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
railties (5.0.2) lib/rails/rack/logger.rb:36:in `call_app'
railties (5.0.2) lib/rails/rack/logger.rb:24:in `block in call'
activesupport (5.0.2) lib/active_support/tagged_logging.rb:69:in `block in tagged'
activesupport (5.0.2) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (5.0.2) lib/active_support/tagged_logging.rb:69:in `tagged'
railties (5.0.2) lib/rails/rack/logger.rb:24:in `call'
sprockets-rails (3.2.0) lib/sprockets/rails/quiet_assets.rb:13:in `call'
actionpack (5.0.2) lib/action_dispatch/middleware/request_id.rb:24:in `call'
rack (2.0.1) lib/rack/method_override.rb:22:in `call'
rack (2.0.1) lib/rack/runtime.rb:22:in `call'
activesupport (5.0.2) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
actionpack (5.0.2) lib/action_dispatch/middleware/executor.rb:12:in `call'
actionpack (5.0.2) lib/action_dispatch/middleware/static.rb:136:in `call'
rack (2.0.1) lib/rack/sendfile.rb:111:in `call'
railties (5.0.2) lib/rails/engine.rb:522:in `call'
puma (3.8.2) lib/puma/configuration.rb:224:in `call'
puma (3.8.2) lib/puma/server.rb:600:in `handle_request'
puma (3.8.2) lib/puma/server.rb:435:in `process_client'
puma (3.8.2) lib/puma/server.rb:299:in `block in run'
puma (3.8.2) lib/puma/thread_pool.rb:120:in `call'
puma (3.8.2) lib/puma/thread_pool.rb:120:in `block in spawn_thread'
Request

Parameters:

{"utf8"=>"✓",
 "_method"=>"patch",
 "authenticity_token"=>"vWSzzeqpPvW5btjlQLy0j3/XewHNw4GfhHBLdeQ28bnqJLDrJCwzFZAe9+N2zXxEQUYEx+ihZJkO5jpu7prCxA==",
 "issue_observation"=>{"crop_x"=>"8", "crop_y"=>"30", "crop_w"=>"242", "crop_h"=>"242"},
 "commit"=>"Crop",
 "id"=>"6"}

Gemfile

source 'https://rubygems.org'

git_source(:github) do |repo_name|
  repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
  "https://github.com/#{repo_name}.git"
end

gem 'sqlite3'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.0.2'
# Use sqlite3 as the database for Active Record
gem "mysql2", "~> 0.4.5"
# Use Puma as the app server
gem 'puma', '~> 3.0'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
gem 'bootstrap-sass', '~> 3.3.6'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views

gem 'coffee-rails', '~> 4.2'
# See https://github.com/rails/execjs#readme for more supported runtimes
gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
gem "twitter-bootstrap-rails"
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0', group: :doc

gem 'rails_admin', '~> 1.1.1'
gem 'rails_admin_material'
gem 'carrierwave'
gem 'carrierwave-dropbox'
gem 'rmagick'

# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Unicorn as the app server
# gem 'unicorn'

# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 3.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platform: :mri
end

group :development do
  # Access an IRB console on exception pages or by using <%= console %> anywhere in the code.
  gem 'web-console', '>= 3.3.0'
  gem 'listen', '~> 3.0.5'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

issue_observation.rb

class IssueObservation < ActiveRecord::Base
	attr_accessor :crop_x, :crop_y, :crop_w, :crop_h
	mount_uploader :attachment, AttachmentUploader
	self.table_name = "IssueObservation"
	after_update :crop_attachment

  def crop_attachment
    attachment.recreate_versions! if crop_x.present?
  end
end

issue_observations_controller.rb

class IssueObservationsController < ApplicationController
	def update
	  @observation = IssueObservation.find(params[:id])
	  if @observation.update_attributes(issue_observation_params)
	    if issue_observation_params[:attachment].present?
	      render :crop
	    else
	      redirect_to rails_admin.show_path(model_name: @observation.class.name, id: @observation), notice: "Successfully updated observation."
	    end
	  else
	    render :new
	  end
	end
end