Rails应用程序下载文档而不是显示

问题描述

我正在为Rails应用程序创建一个文档上传表单，一切正常，除非当我尝试显示刚刚上传的.txt文档时，而是下载了该文档？

这是在show.html.erb文件上运行的两行代码

“查看文件”和“下载”按钮都正在下载文件。

如何显示文件？

这是应用程序控制器：

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

这是文档控制器。上传的文件称为文档：

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

解决方法

您应该检查是否正在Rails控制器中使用选项disposition: :inline发送文件。该选项的默认值为'attachment'。

例如在您的控制器操作中，使用以下命令发送文件：

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

如果您希望在单独的标签中打开链接，则只需在链接选项中添加target: '_blank'。