[英]Rails Active Storage: How to create "named variants" that are cropped by user-supplied coordinates
我有類似的東西:
class User < ApplicationRecord
has_one_attached :avatar do |attachable|
attachable.variant :large, resize_to_limit: [300, nil]
attachable.variant :medium, resize_to_limit: [100, nil]
attachable.variant :small, resize_to_limit: [ 50, nil]
end
end
我如何創建...
[x, y, width, height]
是否有可能以某種方式“將坐標傳遞給模型”? 如果是,如何?
如果不是:是否需要在 controller 操作中單獨進行裁剪,創建一個裁剪版本(原始文件),基於該版本創建“命名變體”? 如果是這樣,那會是什么樣子?
我會試着回答你的問題:
user.avatar.variant(:large)
。 如果在視圖中完成,則附加.processed
以檢索已生成的變體(如果存在)。resize_to_limit: [300, 100], crop: '200x300+0+0'
如果您想從參數中獲取尺寸和坐標,那么我不會使用命名變體,而是使用類似
在模型中: has_one_attached :avatar
在控制器中:
def image_height
params[:height]
end
def generate_variant_small
@user.avatar.variant(resize_to_limit: "300x#{image_height}^", crop: '200x300+0+0').processed
end
這已添加到 Rails 7 ( https://github.com/rails/rails/pull/39135 ):
class User < ActiveRecord::Base
has_one_attached :avatar, variants: {
thumb: { resize: "100x100" },
medium: { resize: "300x300", monochrome: true }
}
end
class Gallery < ActiveRecord::Base
has_many_attached :photos, variants: {
thumb: { resize: "100x100" },
medium: { resize: "300x300", monochrome: true }
}
end
<%= image_tag user.avatar.variant(:thumb) %>
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.