Question

我已经创建了一个图片上传器，并在其中定义了以下版本

version :profile do
  process :resize_and_pad [100, 100]
end

当我上传文件时，收到以下错误消息：

nil is not a symbol

查看完整的堆栈跟踪，它来自processing.rb

carrierwave (0.6.1) lib/carrierwave/uploader/processing.rb:85:in `block in process!'
carrierwave (0.6.1) lib/carrierwave/uploader/processing.rb:81:in `each'
carrierwave (0.6.1) lib/carrierwave/uploader/processing.rb:81:in `process!'
carrierwave (0.6.1) lib/carrierwave/uploader/callbacks.rb:18:in `block in with_callbacks'
carrierwave (0.6.1) lib/carrierwave/uploader/callbacks.rb:18:in `each'
carrierwave (0.6.1) lib/carrierwave/uploader/callbacks.rb:18:in `with_callbacks'
carrierwave (0.6.1) lib/carrierwave/uploader/cache.rb:112:in `cache!'
carrierwave (0.6.1) lib/carrierwave/uploader/versions.rb:230:in `block in cache_versions!'
carrierwave (0.6.1) lib/carrierwave/uploader/versions.rb:216:in `each'
carrierwave (0.6.1) lib/carrierwave/uploader/versions.rb:216:in `cache_versions!'
carrierwave (0.6.1) lib/carrierwave/uploader/callbacks.rb:18:in `block in with_callbacks'
carrierwave (0.6.1) lib/carrierwave/uploader/callbacks.rb:18:in `each'
carrierwave (0.6.1) lib/carrierwave/uploader/callbacks.rb:18:in `with_callbacks'
carrierwave (0.6.1) lib/carrierwave/uploader/cache.rb:112:in `cache!'
carrierwave (0.6.1) lib/carrierwave/uploader/versions.rb:230:in `block in cache_versions!'
carrierwave (0.6.1) lib/carrierwave/uploader/versions.rb:216:in `each'
carrierwave (0.6.1) lib/carrierwave/uploader/versions.rb:216:in `cache_versions!'
carrierwave (0.6.1) lib/carrierwave/uploader/callbacks.rb:18:in `block in with_callbacks'
carrierwave (0.6.1) lib/carrierwave/uploader/callbacks.rb:18:in `each'
carrierwave (0.6.1) lib/carrierwave/uploader/callbacks.rb:18:in `with_callbacks'
carrierwave (0.6.1) lib/carrierwave/uploader/cache.rb:112:in `cache!'
carrierwave (0.6.1) lib/carrierwave/mount.rb:315:in `cache'
carrierwave (0.6.1) lib/carrierwave/mount.rb:173:in `profile_image='
carrierwave (0.6.1) lib/carrierwave/orm/activerecord.rb:37:in `profile_image='
activerecord (3.2.2) lib/active_record/attribute_assignment.rb:85:in `block in assign_attributes'
activerecord (3.2.2) lib/active_record/attribute_assignment.rb:78:in `each'
activerecord (3.2.2) lib/active_record/attribute_assignment.rb:78:in `assign_attributes'
activerecord (3.2.2) lib/active_record/persistence.rb:212:in `block in update_attributes'
activerecord (3.2.2) lib/active_record/transactions.rb:295:in `block in with_transaction_returning_status'
activerecord (3.2.2) lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction'
activerecord (3.2.2) lib/active_record/transactions.rb:208:in `transaction'
activerecord (3.2.2) lib/active_record/transactions.rb:293:in `with_transaction_returning_status'
activerecord (3.2.2) lib/active_record/persistence.rb:211:in `update_attributes'
app/controllers/users_controller.rb:24:in `update_profile'

Answer 1

我认为这是因为缺少参数，请尝试

process :resize_and_pad => [120, 120, "blue", "Center"]

Answer 2

我无法使用一个简单的字符串作为gravityType，试试这个：

process :resize_and_pad => [100, 100, "white", Magick::CenterGravity]

http://rmagick.rubyforge.org/src_over.html

Answer 3

您也可以使用十六进制代码，但需要octothorp。

process :resize_and_pad => [1000,1000,"#222222", Magick::CenterGravity]

CarrierWave和RMagick：使用进程：resize_and_pad抛出nil不是符号错误

3 个答案: