attachment_fu:不要重新加载缩略图 [英] attachment_fu: Don't reload thumbnails

问题描述

我有一个很好的小照片"类，上面附有图像.当我转到页面对照片的顺序进行排序时，它会遍历每张照片，设置新的"sort"值，然后保存它.到目前为止一切都很好.

I've got a nice little "photos" class that has attached images. When I go to the page to sort the photos' order, it iterates though each photo, sets the new "sort" value, and saves it. All good so far.

问题是，我注意到这种行为相当缓慢.事实证明，无论是否有新的图像数据要使用，attachment_fu都会在每次保存时重新加载缩略图.

Problem is, I've noticed this behavior is fairly slow. Turns out, attachment_fu reloads the thumbnail on every save - regardless of whether or not there's new image data to work with.

显然，此系统已经过周密的考虑，因此我仅假设存在针对这种情况的规定.如何在不合适的情况下告诉attachment_fu不要重新生成缩略图?

Obviously this system has been well-thought-out, so I'm only left to assume that a provision exists for this situation. How do I tell attachment_fu not to regenerate the thumbnails when it's not appropriate?

谢谢，-Matchu

我刚刚记得，对于这种特殊情况，我可以使用update_attribute躲避所有验证和其他回调.但是，这并不是解决整个大问题的切实可行的答案.我想念什么?

I just remembered that, for this particular situation, I can use update_attribute to dodge all the validations and other callbacks. However, this isn't really a viable answer to the whole big scenario. What am I missing?

推荐答案

稍微进来并侵入了attach_fu，然后重写了save_attachment?行为.几乎，我添加了一些新条件:除了现有的临时文件之外，还必须满足以下条件之一:

Went in and hacked attachment_fu a bit, and rewrote the save_attachment? behavior. Pretty much, I added some new conditions: in addition to a temp file existing, one of the following must be true:

1. 不存在用于图像的文件(使用full_filename属性).
2. 使用uploaded_data=方法显式更新了图像数据.
3. 图像是缩略图.

1. No file for the image already exists (using the full_filename attribute).
2. The image data was explicitly updated using the uploaded_data= method.
3. The image is a thumbnail.

它通过了所有三个测试用例-新照片上传，编辑照片图像和编辑非图像照片数据-但我还没有真正在野外进行测试.我可能不得不做一些修复.我们将看看会发生什么.

It passes all three test cases - new photo uploads, edit photo images, and editing non-image photo data - but I haven't really tested this out in the wild just yet. I'll probably have to make a few fixes; we'll see what happens.

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