如何使用Geocoder gem成功執行距離查詢？

Question

我正在嘗試使用地理編碼器gem，以便已登錄的用戶可以查看位於5英里范圍內的其他用戶的列表，但似乎無法讓gem顯示結果。 如gem手冊中所述，我的表中有經度和緯度列，並且我的所有測試用戶都具有這些屬性，並且彼此之間相距5英里之內，因此這應該可以工作。 但是，我的視圖頁面（_network.html.erb）當前未顯示任何結果。 我是編碼的新手，非常感謝您的幫助。 下面的代碼，誰能告訴我我在做什么錯，以及如何解決？

users_controller

class UsersController < ApplicationController
  before_filter :authenticate_user!
  helper_method :sort_column, :sort_direction

    def index
      @users = User.near([current_user.longitude, current_user.latitude], 500).order(sort_column + " " + sort_direction).paginate(:per_page => 5, :page => params[:page])
    end

    def show
      @user = User.find(params[:id])
    end

    def new
    end

    def create
    end

    def edit
    end

    def update
      @user = User.find(params[:id])
      if @user.update(user_params)
        flash[:success] = "Your profile has been updated!"
        redirect_to @user
      else
        flash[:error] = "Please try again"
        redirect_to edit_profile_user_path(@user)
      end
    end

    def destroy
    end

    def edit_profile
      @user = User.find(params[:id])
    end

    def user_params
      params.require(:user).permit(:first_name, :last_name, :email, :password, :password_confirmation, :current_industry, :years_in_current_industry, :hobbies, :previous_industries, :bio, :ip_address, :latitude, :longitude, :linkedin)
    end

    def sender
      @user = User.find(params[:id])
    end

    def recipient
      @user = User.find(params[:id])
    end

    def geolocate
      @user = User.find(params[:id])
      if @user.updated_at < 1.day.ago || params[:force] == 'true'
        if @user.update_attributes(latitude: params[:latitude].to_f, longitude: params[:longitude].to_f)
          render nothing: true, status: 200
        else
          render nothing: true, status: 500
        end
      else
        render nothing: true, status: 304
      end
    end

    private

    def sort_column
      User.column_names.include?(params[:sort]) ? params[:sort] : "years_in_current_industry"
    end

    def sort_direction
      %w[asc desc].include?(params[:direction]) ? params[:direction] : "asc"
    end

    def geolocate_user
      location = request.location
      @user.update_attributes(latitude: location.latitude, longitude: location.longitude)
      redirect_to :controller=>'users', :action => 'index'
    end

end

User.rb

class User < ActiveRecord::Base
  devise :database_authenticatable, :registerable,
     :recoverable, :rememberable, :trackable, :validatable

  attr_accessible :first_name, :last_name, :email, :password, :password_confirmation, :remember_me, :current_industry, :years_in_current_industry, :hobbies, :bio, :ip_address, :latitude, :longitude, :previous_industries, :linkedin
  reverse_geocoded_by :latitude, :longitude

  def full_name
    [first_name, last_name].join(" ")
  end

end

index.html.erb

<div id='user_id' data-user=<%= current_user.id %>></div>
<h1>Network</h1>

<%= submit_tag 'GEOLOCATE ME', :type => 'button', class: 'geo-button' %>

<div class ="network">
  <div class="network-body">

    <div id="network"><%= render 'network' %></div>

  </div>
</div>

<br>

_network.html.erb

<table class="table">
  <thead>
    <tr>
      <th>Name</th>
      <th><%= sortable "current_industry", "Current Industry" %></th>
      <th><%= sortable "years_in_current_industry", "Years" %></th>
    </tr>
  </thead>
  <tbody>
    <% @users.each do |user| %>
    <tr>
      <td><%= link_to user.full_name, user_path(user.id) %></td>
      <td><%= user.current_industry %></td>
      <td><%= User::EXPERIENCE[user.years_in_current_industry] %></td>
    </tr>
    <% end %>
  </tbody>
</table>

<%= will_paginate @users %>

Answer 1

只是弄清楚。 我在模型中添加了以下方法：

def geocentric
  User.near([latitude, longitude], 10)
end

並相應地更改了我的控制器

def index
  @users = current_user.geocentric.order(sort_column + " " + sort_direction).paginate(:per_page => 5, :page => params[:page])
end