Rails 应用程序下载文档而不是显示

Question

我正在为我的 Rails 应用程序创建文档上传表单，一切正常，除了当我尝试显示刚刚上传的 .txt 文档时，该文档被下载了吗？

这些是在我的 show.html.erb 文件中运行的两行代码

<%= link_to '查看文件', @document.file %>

<%= link_to '下载', @document.file, 下载: '' %>

查看文件和下载按钮都在下载文件。

我如何 go 关于显示文件？

这是应用程序 controller：

class ApplicationController < ActionController::Base
    before_action :configure_permitted_parameters, if: :devise_controller?

    protected

    def configure_permitted_parameters
        added_attrs = [:username, :email, :password, :password_confirmation, :remember_me]
        devise_parameter_sanitizer.permit :sign_up, keys: added_attrs
        devise_parameter_sanitizer.permit :account_update, keys: added_attrs
    end
end

这是文件 controller。上传的文件称为文件：

class DocumentsController < ApplicationController
  before_action :set_document, only: [:show, :edit, :update, :destroy]
  # GET /documents
  # GET /documents.json
  def index
    @documents = Document.all
  end

  # GET /documents/1
  # GET /documents/1.json
  def show
  end

  # GET /documents/new
  def new
    @document = Document.new
  end

  # GET /documents/1/edit
  def edit
  end

  # POST /documents
  # POST /documents.json
  def create
    @document = Document.new(document_params)

    respond_to do |format|
      if @document.save
        format.html { redirect_to @document, notice: 'Document was successfully created.' }
        format.json { render :show, status: :created, location: @document }
      else
        format.html { render :new }
        format.json { render json: @document.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /documents/1
  # PATCH/PUT /documents/1.json
  def update
    respond_to do |format|
      if @document.update(document_params)
        format.html { redirect_to @document, notice: 'Document was successfully updated.' }
        format.json { render :show, status: :ok, location: @document }
      else
        format.html { render :edit }
        format.json { render json: @document.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /documents/1
  # DELETE /documents/1.json
  def destroy
    @document.destroy
    respond_to do |format|
      format.html { redirect_to documents_url, notice: 'Document was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_document
      @document = Document.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def document_params
      params.require(:document).permit(:title, :description, :file)
    end
end

Answer 1

您应该检查您发送的文件是否带有选项disposition: :inline in your rails controller。该选项的默认值为'attachment' 。

例如，在您的 controller 操作中发送您的文件，例如：

send_file document.file,
          :type => "application/pdf",
          :file_name => document.file.name,
          :disposition => 'inline'

如果您希望您的链接在单独的选项卡中打开，您只需将target: '_blank'添加到您的链接选项。