Rails 4: Link Thumbnailer URI格式错误

Question

我试图使用链接Thumbnailer从食谱网站获取标题，图像和描述，并且由于某种原因，当我提供网站的URL时，我一直得到BadUriFormat错误。

在我看来，我有:

<% @recipes.each do |recipe| %>
  <tr>
    <td class="recipe-info">
        <%= image_tag LinkThumbnailer.generate(recipe.image_link).images.first.src.to_s %>
    </td>
  </tr>

…这个例子中的食谱是:

#<Recipe:0x007fe48394a358> {
    :id => 1,
    :name => "test",
    :image_link => "http://paleoleap.com/simple-beef-shish-kabobs/"
}

这是我的错误:

ETHON: started MULTI
ETHON:         performed EASY effective_url=http://res.cloudinary.com/paleoleap/image/upload/f_auto,q_90/v1459886762/j-paleo/simple-beef-shish-kabob-main.jpg response_code=200 return_code=write_error total_time=0.04831799999999997
ETHON: performed MULTI
ETHON: started MULTI
ETHON:         performed EASY effective_url=http://paleoleap.com/pictures/icons/servings.png response_code=200 return_code=write_error total_time=0.053881
ETHON: performed MULTI
ETHON: started MULTI
ETHON:         performed EASY effective_url=http://paleoleap.com/pictures/icons/prep3.png response_code=200 return_code=write_error total_time=0.050677
ETHON: performed MULTI
ETHON: started MULTI
ETHON:         performed EASY effective_url=http://paleoleap.com/pictures/icons/cooking4.png response_code=200 return_code=write_error total_time=0.044727
ETHON: performed MULTI
ETHON: started MULTI
ETHON:         performed EASY effective_url=http://res.cloudinary.com/paleoleap/image/upload/f_auto,q_90/v1459886762/j-paleo/simple-beef-shish-kabob-preparation.jpg response_code=200 return_code=write_error total_time=0.048975
ETHON: performed MULTI
  Rendered recipes/index.html.erb within layouts/application (510.5ms)
Completed 500 Internal Server Error in 1040ms (ActiveRecord: 7.3ms)
LinkThumbnailer::BadUriFormat (LinkThumbnailer::BadUriFormat):
  app/views/recipes/index.html.erb:46:in `block in _app_views_recipes_index_html_erb___148801017206438179_70110103402900'
  app/views/recipes/index.html.erb:26:in `_app_views_recipes_index_html_erb___148801017206438179_70110103402900'

当我通过执行LinkThumbnailer.generate(Recipe.find(1))在控制器中获取图像时，它运行没有问题。

结果如下:

ETHON: started MULTI
ETHON:         performed EASY effective_url=http://res.cloudinary.com/paleoleap/image/upload/f_auto,q_90/v1459886762/j-paleo/simple-beef-shish-kabob-main.jpg response_code=200 return_code=write_error total_time=0.056864
ETHON: performed MULTI
ETHON: started MULTI
ETHON:         performed EASY effective_url=http://paleoleap.com/pictures/icons/servings.png response_code=200 return_code=write_error total_time=0.04847
ETHON: performed MULTI
ETHON: started MULTI
ETHON:         performed EASY effective_url=http://paleoleap.com/pictures/icons/prep3.png response_code=200 return_code=write_error total_time=0.04541
ETHON: performed MULTI
ETHON: started MULTI
ETHON:         performed EASY effective_url=http://paleoleap.com/pictures/icons/cooking4.png response_code=200 return_code=write_error total_time=0.039456
ETHON: performed MULTI
ETHON: started MULTI
ETHON:         performed EASY effective_url=http://res.cloudinary.com/paleoleap/image/upload/f_auto,q_90/v1459886762/j-paleo/simple-beef-shish-kabob-preparation.jpg response_code=200 return_code=write_error total_time=0.0386
ETHON: performed MULTI

在我的循环中调用recipe.image_link上的generate方法与在控制器中的特定Recipe上调用它之间的区别是什么?

Answer 1

写下我的评论作为答案。你的@recipes数组必须包含一个空值，否则gem会引发BadUriFormat异常。

另外，我建议使用以下选项来避免gem在获取网站时进行不必要的计算:

LinkThumbnailer.generate(url, attributes: [:images], image_limit: 1, image_stats: false)

• attributes——将告诉gem只关心图像
• image_limit——将告诉gem只获取一张图像。然而，它可能不是最好的，因为它不会尝试获取多个图像。
• image_stats——将告诉gem不要关心图像的大小和类型