首页 \ 问答 \ 如何在.map方法之后摆脱数组(How to get rid of array after .map method)

如何在.map方法之后摆脱数组(How to get rid of array after .map method)

我正在实例化一个变量:

搜索控制器:

@search_results = Business.near(params[:search_zip], params[:radius]).to_a

搜索视图

<%= @search_results.map do |sr| %>
  <%= sr.business_name %>
<% end %>

=> PetStore FoodStore BeautyStore ClothingStore ["\n", "\n", "\n", "\n"]`

我怎么能在最后摆脱阵列?


I am instantiating a variable like so:

Searches Controller:

@search_results = Business.near(params[:search_zip], params[:radius]).to_a

Searches View

<%= @search_results.map do |sr| %>
  <%= sr.business_name %>
<% end %>

=> PetStore FoodStore BeautyStore ClothingStore ["\n", "\n", "\n", "\n"]`

How can I get rid of the array at the end?


原文:https://stackoverflow.com/questions/38174153
更新时间:2020-03-26 12:16

最满意答案

打印数组是因为您使用<%=而不是<% 。 更改

<%= @search_results.map do |sr| %>
  <%= sr.business_name %>
<% end %>

<% @search_results.map do |sr| %>
  <%= sr.business_name %>
<% end %>

map返回块的评估。 然后由于<%=打印返回的值。

另请注意,您不需要mapeach都足够,在这种情况下可以节省资源:

<% @search_results.each do |sr| %>
  <%= sr.business_name %>
<% end %>

The array is printed because you are using <%= instead of <%. Change

<%= @search_results.map do |sr| %>
  <%= sr.business_name %>
<% end %>

to

<% @search_results.map do |sr| %>
  <%= sr.business_name %>
<% end %>

map returns the evaluation of the block. The returned value is then printed because of <%=.

Also note you don't need a map, each is sufficient and will save you resources in this case:

<% @search_results.each do |sr| %>
  <%= sr.business_name %>
<% end %>
2016-07-03

相关文章

更多

最新问答

更多
  • css在元素之前中断列而不破坏包装器(css break column before element without breaking the wrapper)
  • 如何在Xamarin共享项目中使用自定义渲染器(How to use Custom Renderer in Xamarin Shared Project)
  • 如何为特定表中的特定字段设置唯一?(How to set unique for specific field from specific table?)
  • Google SDK iOS - sign()方法完成处理程序(Google SDK iOS - sign() method completion handler)
  • 在具有接口{}值的地图上实现String()(Implement String() on a map with interface{} values)
  • 检查数据库中是否已存在用户名(Check if username already exist in DB)
  • 使用javascript进行ajax调用时阻止用户交互(Block user interaction while doing ajax call using javascript)
  • 什么'if(err)'在Javascript中精确测试?(What does 'if (err)' tests precisely in Javascript?)
  • jQuery mouseleave无法正常工作(jQuery mouseleave not working)
  • 寻求使用的一些说明(Seeking some clarification on use of )
  • 将数组传递给注释的语法(syntax for passing array to annotation)
  • 用于从两个日期范围之间的文件中提取数据的Shell脚本(Shell script to extract data from file between two date ranges)
  • 元素隐藏但父()没有(Element hides but parent() not)
  • 如何使用Google App Engine Java平台开发web ui(How to develop web ui with Google App Engine Java platform)
  • 对于OWL A级;(For an OWL class A; Getting all properties that A is their domain)
  • Excel VBA公式格式问题(Excel VBA Formula Format Issue)
  • ORA - 02287序列号不允许在这里(ORA - 02287 sequence number not allowed here)
  • Github拉忽略特定文件(Github Pull Ignore Specific File)
  • SQL CONVERT函数在SQL Server中工作但不在应用程序中(SQL CONVERT function working in SQL Server but not in application)
  • backbone.js适用于大型应用程序(backbone.js for large applications)
  • 防止程序关闭(Preventing program from closing)
  • 生成不带图像的heightMap(Generating a heightMap without an Image)
  • Bootstrap - 如何将包含文本的div居中?(Bootstrap - How to center div that has text inside it?)
  • Android - 片段findViewById()总是null?(Android - Fragment findViewById() always null?)
  • 确定CSS中的高度(Figuring out heights in CSS)
  • 使用__autoload包含类和使用命名空间(Use __autoload to include class and use namespace)
  • setTimeout()不允许我传递文本值[重复](setTimeout() doesn't allow me to pass text values [duplicate])
  • 在NSUserDefault中恢复值(Restoring value in NSUserDefault)
  • 知道如何将这种下沉的悬停效果添加到图像/链接吗?(Any idea how to add this sinking hover effect to an image/link?)
  • 在XIB中淡入/淡出UISegmentedControl(fade in/fade out UISegmentedControl in XIB)