rails collection_select params

Question

因此，我试图根据collection_select下拉框筛选一些数据。

我可以成功地使用text_field_tag来过滤数据，所以我认为我的过滤器工作正常，但我不能让collection_select也这样做？

如果我在text_field_tag中键入1，我会生成"search"=>"1"作为参数的一部分，但如果我从collection_select中选择，我会得到。。。｛"utf8"=>"✓"，"search"=>｛"search"=>"1"｝，…

index.html.erb

 <h1>Students#index</h1>
<p>Find me in app/views/students/index.html.erb</p>
<%= form_tag students_path, :method => 'get' do %>
  <%= collection_select :search ,  :search.to_s, Tutor.all, :id, :name, prompt: true %>
  <%= submit_tag "search" %>
<% end %>
<% @students.each do |n| %>
  <li>
    <%= link_to n.first_name, student_path(n) %>
    <%= n.surname %> ..tutor is...
    <%= n.tutor.name %>
  </li>
 <% end %>
<%= params.inspect %>
<%= form_tag(students_path, :method=> "get", id: "search-form") do %>
  <%= text_field_tag :search, params[:search], placeholder: "Search Students" %>
  <%= submit_tag "Search", :name => nil %>
<% end %>

student.rb

class Student < ActiveRecord::Base
  belongs_to :tutor
  def self.search(search)
    where("tutor_id LIKE ?","%#{search }%")
  end
end

students_controller.rb

class StudentsController < ApplicationController
  def index
    if params[:search]
      @students = Student.search(params[:search])
    else
      @students = Student.all
    end
  end

Answer 1

这就是collection_select的工作方式。collection_select的第一个参数是对象，而不是方法，所以您的参数看起来是这样的。

将params[:search]更改为params[:search][:search]应该可以解决您的问题。

class StudentsController < ApplicationController
  def index
    if params[:search][:search]
      @students = Student.search(params[:search][:search])
    else
      @students = Student.all
    end
  end
end