条件转换选项回形针 [英] conditional convert options paperclip
问题描述
经过一些研究之后能够根据我的 image_class
列添加样式.
After some research I was able to add styles based on my image_class
column.
Model.rb
has_attached_file :image,
:styles => lambda { |attachment| attachment.instance.decide_styles }
def decide_styles
styles = {}
case self.image_class
when "poster"
styles[:thumb] = ["30x45!", :jpg]
styles[:standard] = ["185x278!", :jpg]
styles[:expanded] = ["372x559!", :jpg]
styles[:big] = ["600x900!", :jpg]
when "cover"
styles[:thumb] = ["30x45!", :jpg]
styles[:standard] = ["300x1200!", :jpg]
end
styles
end
这很顺利,现在我也想添加条件 convert_options.这以某种方式失败了.
This works smoothly, now I wanted to add conditional convert_options as well. This somehow fails.
has_attached_file :image,
:styles => lambda { |attachment| attachment.instance.decide_styles },
:convert_options => lambda { |attachment| attachment.instance.decide_convert_options }
def decide_styles
...
end
def decide_convert_options
opshunz = {}
case self.image_class
when "poster"
opshunz[:thumb] = "-flop"
opshunz[:standard] = "-flop"
opshunz[:expanded] = "-flop"
opshunz[:big] = "-flop"
when "cover"
opshunz[:thumb] = "-enhance"
opshunz[:standard] = "-enhance"
end
opshunz
end
错误:
NoMethodError: undefined method `instance' for :all:Symbol
from /Users/AnsPoluke/Sites/nulike/app/models/movie_image.rb:8:in `block in <class:MovieImage>'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/attachment.rb:431:in `[]'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/attachment.rb:431:in `process_options'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/attachment.rb:423:in `extra_options_for'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/style.rb:56:in `convert_options'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/style.rb:79:in `block in processor_options'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/style.rb:78:in `each'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/style.rb:78:in `processor_options'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/attachment.rb:462:in `block in post_process_style'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/attachment.rb:461:in `each'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/attachment.rb:461:in `inject'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/attachment.rb:461:in `post_process_style'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/attachment.rb:454:in `block in post_process_styles'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/attachment.rb:453:in `each'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/attachment.rb:453:in `post_process_styles'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/attachment.rb:445:in `block (2 levels) in post_process'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/activesupport-4.0.2/lib/active_support/callbacks.rb:393:in `_run__3861360263242897910__image_post_process__callbacks'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/activesupport-4.0.2/lib/active_support/callbacks.rb:80:in `run_callbacks'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/callbacks.rb:36:in `run_paperclip_callbacks'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/attachment.rb:443:in `block in post_process'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/activesupport-4.0.2/lib/active_support/callbacks.rb:383:in `_run__3861360263242897910__post_process__callbacks'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/activesupport-4.0.2/lib/active_support/callbacks.rb:80:in `run_callbacks'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/callbacks.rb:36:in `run_paperclip_callbacks'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/attachment.rb:442:in `post_process'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/attachment.rb:114:in `assign'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/paperclip-4.1.1/lib/paperclip/has_attached_file.rb:66:in `block in define_setter'
from (irb):2
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/railties-4.0.2/lib/rails/commands/console.rb:90:in `start'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/railties-4.0.2/lib/rails/commands/console.rb:9:in `start'
from /Users/AnsPoluke/.rvm/gems/ruby-2.1.0/gems/railties-4.0.2/lib/rails/commands.rb:62:in `<top (required)>'
from bin/rails:4:in `require'
任何想法为什么它与 styles
完美配合,但在 convert_options
中失败?
Any ideas why it works perfectly with styles
but fails with convert_options
?
推荐答案
注意:尚未在工作代码中验证这一点
note: haven't verified that on working code
似乎传入 :convert_options 的块的参数已经是一个实例,而不是附件(与样式选项相反,它是一个附件)
It seems that the argument to the block passed in :convert_options is already an instance, not the attachment (as opposed to styles option, where it is an attachment)
试试:
convert_options: lambda { |instance| instance.decide_convert_options }
顺便说一句,如果您提取配置数据,您的代码看起来会更好,例如:
Btw your code would look much better if you extract the configuration data, for example:
has_attached_file :image,
styles: lambda { |attachment| attachment.instance.image_options[:styles] },
convert_options: lambda { |instance| instance.image_options[:convert_options] }
IMAGE_OPTIONS = {
poster: {
styles: {
thumb: ["30x45!", :jpg],
standard: ["185x278!", :jpg],
expanded: ["372x559!", :jpg]
big: ["600x900!", :jpg]
},
convert_options: {
thumb: "-flop",
standard: "-flop",
expanded: "-flop",
big: = "-flop"
}
},
cover: {
styles: {
thumb: ["30x45!", :jpg],
standard: ["300x1200!", :jpg]
},
convert_options: {
thumb: "-enhance",
standard: "-enhance"
}
}
}
def image_options
IMAGE_OPTIONS[self.image_class]
end
希望能帮到你
更新:
您的 convert_options 似乎没有在此处设置:https://github.com/thoughtbot/paperclip/blob/a93dfc773b4fd649db4d1281b42a2a71b1ae72ff/lib/paperclip/style.rb#L55
it looks like your convert_options are not being set here: https://github.com/thoughtbot/paperclip/blob/a93dfc773b4fd649db4d1281b42a2a71b1ae72ff/lib/paperclip/style.rb#L55
似乎他们建议传递带有样式的 convert_options,例如在此规范中:https://github.com/thoughtbot/paperclip/blob/263a498195d47563a6227be18cf4463c4c6e7903/spec/paperclip/style_spec.rb#L41
it seems they recommend passing convert_options with styles, like in this spec: https://github.com/thoughtbot/paperclip/blob/263a498195d47563a6227be18cf4463c4c6e7903/spec/paperclip/style_spec.rb#L41
你可以试试这个吗?所以完全删除 convert_options,并在您的配置中返回哈希值,如:
can you try this? so remove convert_options entirely, and in your configuration return hash like:
IMAGE_OPTIONS = {
poster: {
styles: {
thumb: {
geometry: "30x45!",
format: :jpg,
convert_options: '-flop',
},
standard: {...}
expanded: {...}
big: {...}
}
},
cover: {
styles: {...}
这篇关于条件转换选项回形针的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!