ruby-on-rails - Rails file_field 不上传图像

Question

我的 Controller :

class ArticlesController < ApplicationController

    def index
        @articles = Article.organise
    end

    def show
        @article = Article.find(params[:id])
    end

    def edit
        @article = Article.find(params[:id])
    end

    def update
        @article = Article.find(params[:id])
        @article.update(article_params)
        redirect_to @article
    end

    def new
        @article = Article.new
    end

    def create
        @article = Article.new(article_params)
        @article.save
        redirect_to @article
    end

    def destroy
        @article = Article.find(params[:id])
        @article.destroy
        redirect_to articles_path
    end


    private

    def article_params
        params.require(:article).permit(:title, :brief, :posted_by, :posted_at, :posted_from, :image_file_name)
    end



end

我的看法:

  <p>
      <%= f.label :Image %><br/>
      <%= f.file_field :image_file_name %>
  </p>

我的模型:

class Article < ActiveRecord::Base

    def self.organise
        order("posted_at desc")
    end



end

我在 Controller 中的参数:

def article_params
  params.require(:article).permit(:title, :brief, :posted_by, :posted_at, :posted_from, :image_file_name)
end

正在返回此错误，我认为它与 Controller 参数有关，但我不太确定。

ActiveRecord::StatementInvalid in ArticlesController#create
 TypeError: can't cast ActionDispatch::Http::UploadedFile to string: INSERT INTO "articles" ("brief", "created_at", "image_file_name", "posted_at", "posted_by", "posted_from", "title", "updated_at") VALUES (?, ?, ?, ?, ?, ?, ?, ?)

Answer 1

我相信您没有使用任何 gem 进行文件上传。

<%= form_for @article, {},:html => {:multipart => true } do |f| %>
 <p>
  <%= f.label :Image %><br/>
  <%= f.file_field 'file' %>
  <%= f.submit "Upload" %>
 </p>
<% end %>

将此添加到您的创建操作中并上传到相同的服务器位置/assets/images

if params[:article].present?
 file = params[:article][:file]
 File.open(Rails.root.join('app','assets', 'images', file.original_filename), 'wb') do |f|
  f.write(file.read)
 end
end