Question

如果存在两个参数，我希望搜索并找到结果，但我会被发送到car_show_path，但应该有结果。

模型

class Car < ActiveRecord::Base
  def self.search(car_number, car_model) 
    where(['car_number = ? AND car_model = ?', "%#{car_number}%", "%#{car_model}%"])
  end
end

控制器显示

 @search = Car.search(params[:car_number], params[:car_model])
   if @search.present?
       @search
    else
     redirect_to car_path, notice: "Not a valid combination"
    end

表格

<%= simple_form_for :search, url: car_show_path do |f| %>
  <%= f.input :car_number, :collection => @car.collect {|c| [c.number]}, :include_blank => false %>
  <%= f.input :car_model, placeholder: "Car Model" %>
  <%= f.button :submit, 'Generate', class: 'btn' %>
<% end %>

Answer 1

你做错了。如果查看服务器日志中生成的params哈希值，您可以看到类似:search => {:car_model => "value", :car_number => "Value"}的内容。这意味着无法使用:car_model和:car_number检索params[:car_model]和params[:car_number]的值，而应使用params[:search][:car_model]和params[:search][:car_number]

@search = Car.search(params[:search][:car_number], params[:search][:car_model])
if @search.present?
  @search
else
  redirect_to car_path, notice: "Not a valid combination"
end

Answer 2

我看到了您提供的代码。我相信你写的代码需要一些改进。所以我重新编写了可以解决您的问题并实现目标的代码。这是：

#/app/models/car.rb

class Car < ActiveRecord::Base
  def self.search(cn, cm) 
    where('car_number = ? AND car_model = ?', cn, cm)
  end
end

#/app/controllers/cars_controller.rb

class CarsController < ApplicationController

  def search
    @result = Car.search params[c_number], params[c_modal]
  end
end


#/app/views/cars/search.html.erb
#you can generate similar form with simple_form_for

<form action="/search" method="/get" >
  <input type="text" name="c_number"
  <input type="text" name="c_modal">
  <input type="submit" value="search">
</form>

<% if !@result.any? %>
  Not a valid combination
<% end %>

<% @result.each do |r|%>
  <%= r.car_number %>
  <%= r.car_modal %>
<% end %>


#/config/routes.rb

get "/search" => "cars#search"

注意：上面的代码是我最好的做法，并没有在本地执行。

希望有所帮助!!!

Answer 3

您将相同的值放入要发送到搜索方法的查询参数的两个占位符中。这似乎不对。

Rails 4搜索Multiple Params

3 个答案: