将二维码生成改为图片显示

Gemfile

@@ -27,6 +27,7 @@ gem 'nokogiri'
 gem 'angularjs-rails'
 gem 'figaro'
 gem 'rqrcode-with-patches', require: 'rqrcode'
+gem 'chunky_png'
 gem 'sidekiq'
 gem 'rest-client'
 

Gemfile.lock

@@ -258,6 +258,7 @@ DEPENDENCIES
   angularjs-rails
   capybara
   carrierwave-mongoid
+  chunky_png
   coffee-rails (~> 4.0.1)
   database_cleaner
   factory_girl_rails

app/controllers/qrcodes_controller.rb

@@ -0,0 +1,16 @@
+class QrcodesController < ApplicationController
+  def show
+    str = params[:str].to_s
+    max_length = 50
+    if str.length > max_length
+      render nothing: true, status: 404
+      return
+    end
+    require 'rqrcode/export/png'
+    qr = RQRCode::QRCode.new(str)
+    response.headers['Cache-Control'] = "public, max-age=#{12.hours.to_i}"
+    response.headers['Content-Type'] = 'image/png'
+    response.headers['Content-Disposition'] = 'inline'
+    render :text => qr.as_png
+  end
+end

app/views/blogs/_qrcode.html.slim

@@ -1,4 +1,3 @@
 .qrcode-image
-  - qr = RQRCode::QRCode.new(str)
-  == qr.as_html
+  = image_tag( qrcodes_path(str: str) )
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config/routes.rb

@@ -16,7 +16,8 @@ WBlog::Application.routes.draw do
 
   resources :archives
   # photos
-  resources :photos, :only=>[:create]
+  resources :photos, only: [:create]
+  get '/qrcodes' => 'qrcodes#show'
   
   namespace :admin do
     resources :posts do