使用 Rails 3 生成和下载 Pdf 文件

Question

我的代码有问题。当用户单击索引页面上提供的下载链接时，PDF 文件将生成，同时它将使用 Rails 3 下载。我正在使用 prawn gem 生成 PDF .但我不知道rails中link_to标签中的路由路径应该是什么。请检查我下面的代码。

产品/index.html.erb：

<h1>Choose the option</h1>
<p>
    <%= link_to "new input",products_new_path %>
</p>
<table>
    <tr>
       <th>Product name</th>
       <th>Product Catagory</th>
    </tr>
    <% @product.each do |p| %>
    <tr>
        <td><%= p.p_name %></td>
        <td><%= p.p_catagory %></td>
    </tr>
    <% end %>
</table>
<%= link_to "Download Pdf" %>

控制器/products_controller.rb：

class ProductsController < ApplicationController
    def index
        @product=Product.all
        require "prawn/table"
        require "prawn"
        Prawn::Document.generate("test.pdf") do |pdf|
            table_data = Array.new
            table_data << ["Product name", "Product category"]
            @product.each do |p|
                table_data << [p.p_name, p.p_catagory]
            end
            pdf.table(table_data, :width => 500, :cell_style => { :inline_format => true })
        end
    end
    def new
        @product=Product.new
    end
    def create
        @product=Product.new(params[:product])
        if @product.save
            flash[:notice]="Data submitted"
            flash[:color]="valid"
            redirect_to :action => "index"
        else
            flash[:alert]="Data could not finish"
            flash[:color]="invalid"
            render 'new'
        end
    end
end

宝石文件：

source 'https://rubygems.org'

gem 'rails', '3.2.19'

# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'

gem 'sqlite3'


# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'

  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  # gem 'therubyracer', :platforms => :ruby

  gem 'uglifier', '>= 1.0.3'
end

gem 'jquery-rails'

# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.0.0'

# To use Jbuilder templates for JSON
# gem 'jbuilder'

# Use unicorn as the app server
# gem 'unicorn'

# Deploy with Capistrano
# gem 'capistrano'

# To use debugger
# gem 'debugger'
gem 'prawn', '~> 1.3.0'
gem 'prawn-table', '~> 0.2.1'

routes.rb:

Generate::Application.routes.draw do
  root :to => "products#index"
  get "products/new" => "products#new"
  post "products/create" => "products#create"

end

我的要求是当用户点击"Download pdf"链接时，html表值将转换为pdf并生成用于打印和下载。请帮我解决这个问题。

Answer 1

产品/index.html.erb：

<%= link_to "Download_pdf", download_pdf_path(:format => 'pdf') %>

宝石文件：

gem 'prawn'
gem 'prawn-table'

routes.rb，添加以下路由：

get "products/download_pdf" => "products#download_pdf", :as => 'download_pdf'

进行捆绑安装。

products_controller.rb

require "prawn"
  require "prawn/table"

      def download_pdf
        @product = Product.all
        respond_to do |format|
          format.pdf do
            pdf = Prawn::Document.new
            table_data = Array.new
            table_data << ["Product name", "Product category"]
            @product.each do |p|
                table_data << [p.p_name, p.p_catagory]
            end
            pdf.table(table_data, :width => 500, :cell_style => { :inline_format => true })
            send_data pdf.render, filename: 'test.pdf', type: 'application/pdf', :disposition => 'inline'
          end
        end
      end

这将生成您的 pdf。