动态定义回形针样式大小 [英] Define paperclip style sizes dynamicaly

问题描述

我有一个应用程序，用户可以在其中选择模板.在此模板上，用户可以上传图像.

I have an application where a user chooses a template. On this template the user can upload an image.

我使用回形针上传图片.

I use paperclip to upload the images.

每个模板都有不同的图像大小.

Each template has different image sizes.

是否可以在回形针中动态设置图像样式 => 'widthxheight'?

Is it possible to set an image style => 'widthxheight' dynamically in paperclip?

我想要这个功能，因为如果用户决定更改模板，那么他们不必再次上传照片，他们只需裁剪原始".

I want this functionality because if the user decides to change template then they don't have to upload the photo again they just crop the 'original'.

感谢您的帮助.

我会努力解决这个问题.

I will try to clear this up.

用户上传了页面标题的图片.样式可以称为标题"，尺寸应该是该标题空间的尺寸，例如400x600"

A user uploads an image for the header of a page. The style could be called "header" and the dimensions should be the dimensions for that header space, say "400x600"

现在用户查看他们上传到图库中的图像.他们想为他们的页面选择一张图片，但这次是为尺寸为300x100"的侧边栏"选择一张图片.我不想让他们再次上传相同的图片.我想创建一个名为侧边栏"的新样式，尺寸为300x100".我也不想删除标题"样式或调整它的大小.

Now the user views the images they have uploaded in a gallery. They want to select one of the images for their page but this time its for the "sidebar" which has dimensions "300x100". I don't want to make them upload the same image again. I want to create a new style called "sidebar" with dimensions "300x100". I also don't want to delete the "header" style or resize it.

如何用回形针做到这一点?

How can I do this with paperclip?

推荐答案

如果我知道你有这样的想法:回形针改变大小

If I understand you have in mind something like that: Paperclip change size

另外:

attr_accessor :size

...
self.dimensions = self.size.split("x")

控制器:

def create
  ...
  @file.size = params[:size] # OR Simply include such field in form
  ...
end

示例:

型号:

class File
  has_attached_file :upload
  attr_accessor :size
  before_save :extract_dimensions
  serialize :dimensions
  ...
  def extract_dimensions
    ...
    self.dimensions = self.size.split("x")
  end
end

表格:

<form action="some link">
  ...
  <label>Size: </label><select name="file_size">
    <option value="100x200">Large</option>
    ...
  </select>
</form>

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