Question

我是一名铁路4初学者，他整天都困惑于这个问题。我想从用户表中提取位置以在api中使用，但我不断收到此错误：

＃＆lt; User :: ActiveRecord_Relation的未定义方法`location'：0x007f7082b4cfe0＆gt;

这是我的代码：

def index
@users = User.all

if session[:user_id]
  origin = current_user.location    
  destination = @users.location
url = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=#{origin}&destinations=#{destination}"
result = open(url).read
parsed_result = JSON.parse(result)
distance_in_km = parsed_result['rows'][0]["elements"][0]["distance"]["text"]
@distance = distance_in_km
@duration =parsed_result['rows'][0]["elements"][0]["duration"]["text"]
else
  origin = "boston"
destination = "michigan"
url = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=#{origin}&destinations=#{destination}"
result = open(url).read
parsed_result = JSON.parse(result)
distance_in_km = parsed_result['rows'][0]["elements"][0]["distance"]["text"]
@distance = distance_in_km
@duration =parsed_result['rows'][0]["elements"][0]["duration"]["text"]
end
end

以下是我的观点：

<% @users.each do |user| %>
<tr>

 <td><%= user.name %></td> 
  <td><%= user.email %></td>
  <td><a href="/users/<%= user.id %>">Show</a> </td>   
  <td><a href="/users/<%= user.id %>/edit">Edit</a></td>
 <td><a href="/users/<%= user.id %>/destroy">Destroy</a></td>
  <td> Distance from you: <%=@distance%> km <br /> It should take you <%= @duration%> to drive there. </td>

</tr>

Answer 1

位置未在@users中定义（因为是一组用户），但在用户中。你必须做这样的事情：

@users = User.all

@users.each do |user|
 if session[:user_id]
  origin = current_user.location    
  destination = user.location

etc

active_record错误的未定义方法

1 个答案: