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[英]I am using a form select in ruby on rails. How do I get the blank default to show prompt message?
[英]I want to show in index one select photo from multiple upload photos, in ruby on rails. How can i do?
郵寄 Model
class Post < ApplicationRecord
has_many_attached :images
end
Controller
params.require(:post).permit(:title, :body, images: [])
有人解釋我......
在索引中,您可以通過以下方式獲取第一張圖片:
@posts.each do |post|
first_image = post.images.first # do something with it.
end
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