载波，MiniMagick-NoMethodError：nil：NilClass的未定义方法`size'

Question

在暂存阶段，我在通过载波和minimagick上传图像并调整其大小时遇到​​以下错误。 在本地，一切正常。

载波（0.9.0）mini_magick（3.7.0）

irb(main):003:0> PicturePost.create(remote_content_url: 'http://www.imagpress.com/img/slider/slider_1.jpg')
NoMethodError: undefined method `size' for nil:NilClass
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/mini_magick-3.7.0/lib/mini_magick.rb:24:in `choose_processor'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/mini_magick-3.7.0/lib/mini_magick.rb:64:in `mogrify?'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/mini_magick-3.7.0/lib/mini_magick/image.rb:360:in `run_command'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/mini_magick-3.7.0/lib/mini_magick/image.rb:171:in `valid?'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/mini_magick-3.7.0/lib/mini_magick/image.rb:140:in `create'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/mini_magick-3.7.0/lib/mini_magick/image.rb:48:in `read'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/mini_magick-3.7.0/lib/mini_magick/image.rb:111:in `block in open'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/mini_magick-3.7.0/lib/mini_magick/image.rb:110:in `open'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/mini_magick-3.7.0/lib/mini_magick/image.rb:110:in `open'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/processing/mini_magick.rb:260:in `manipulate!'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/processing/mini_magick.rb:176:in `resize_to_fill'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/uploader/processing.rb:85:in `block in process!'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/uploader/processing.rb:81:in `each'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/uploader/processing.rb:81:in `process!'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/uploader/callbacks.rb:18:in `block in with_callbacks'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/uploader/callbacks.rb:18:in `each'
9 levels...
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/uploader/download.rb:65:in `download!'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/mount.rb:353:in `remote_url='
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/mount.rb:203:in `remote_content_url='
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/orm/activerecord.rb:44:in `remote_content_url='
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/activerecord-3.2.15/lib/active_record/attribute_assignment.rb:85:in `block in assign_attributes'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/activerecord-3.2.15/lib/active_record/attribute_assignment.rb:78:in `each'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/activerecord-3.2.15/lib/active_record/attribute_assignment.rb:78:in `assign_attributes'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/activerecord-3.2.15/lib/active_record/base.rb:498:in `initialize'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/activerecord-3.2.15/lib/active_record/persistence.rb:44:in `new'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/activerecord-3.2.15/lib/active_record/persistence.rb:44:in `create'
from (irb):3
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/railties-3.2.15/lib/rails/commands/console.rb:47:in `start'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/railties-3.2.15/lib/rails/commands/console.rb:8:in `start'
from /home/deploy/apps/staging/blog/shared/bundle/ruby/1.9.1/gems/railties-3.2.15/lib/rails/commands.rb:41:in `<top (required)>'
from script/rails:6:in `require'

无法弄清楚为什么会这样。

Answer 1

忘记了在新服务器上安装imagemagick。 这为我解决了这个问题

sudo apt-get install imagemagick

Answer 2

当MiniMagick寻找命令mogrify或gm而找不到任何一个时，会发生此错误。

如另一个答案中所述，您需要确保通过以下命令安装ImageMagick或GraphicsMagick

sudo apt-get install imagemagick

但是，如果ImageMagick安装在非标准位置并且在Rails进程的路径上不可用，也会发生此问题。 例如，如果从源安装到/usr/local/bin ，则该位置可能不在路径上。 在这种情况下，为确保正确设置路径，请将此行添加到application.rb ， environments/production.rb或其他合适的位置：

ENV['PATH'] += File::PATH_SEPARATOR + '/usr/local/bin'

请注意，您的路径可能会有所不同，具体取决于启动应用程序的方式（例如，从命令行还是从系统初始化文件），因此添加这样的行对于确保MiniMagick在所有情况下均能正常工作很重要。

在Linux下，可以通过找到pid然后查看/proc/<pid>/environ来检查正在运行的Rails进程的路径。

Answer 3

mini_magick 3.7.0似乎有问题。 看看这个问题

Answer 4

自制和优胜美地为中心的答案：

http://thornelabs.net/2014/12/08/libpng-not-symlinking-when-installing-imagemagick-on-os-x-yosemite.html

当然，您需要重新安装ImageMagick，但是如果正在运行

brew install imagemagick

给您一个错误，例如：

Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink share/man/man5/png.5
/usr/local/share/man/man5 is not writable.
...

首先，检查您的用户名是否具有

ls -al /usr/local/share/man

如果不这样做，则需要运行

sudo chown -R yourusername /usr/local/share/man/man5
brew link libpng

希望这可以节省一些时间。

-B

Answer 5

如果您使用的是yum软件包管理器（例如我在AWS Opsworks中使用）。 你可以做

yum install ImageMagick

注意：ImageMagick拼写为camelcase

Answer 6

如果您使用某些IDE，则仅通过重新启动IDE即可解决问题。 我花了很多时间试图找到解决这个问题的方法。 这个简单的操作对我有用。

Answer 7

对于使用Rails并使用mini_magick的其他人，请将您的gemfile中的版本更改为3.5，因为使用mini_magick上载图像时3.6已损坏，并且根本不适用于3.7版本。