pg_search使用一个文本字段和一个类别select-type字段

Question

Ruby on Rails新手。我是尝试使用pg_search gem但遇到一些困难（是的，我正在查看文档）。我想要一个包含文本字段和选择字段（类别）的搜索表单。这里是我的代码至今：

contact_info.rb

class ContactInfo < ActiveRecord::Base 
... 
include PgSearch 
    pg_search_scope :search_by_category, (lambda do |category, query| 
    raise ArgumentError unless [:prev, :cat].include?(category) 
    { 
     :against => category, 
     :query => query 
    } 
    end 
end 

home_controller.rb

class HomeController < ApplicationController 
    def index 
    @contact_infos = ContactInfo.search_by_category(params[:query]) 
    respond_to do |format| 
     format.html # index.html.erb 
     format.json { render json: @contact_infos } 
    end 
end 

家\ index.html.erb

<%= form_for :search_by_category, :url => {:controller => 'home', :action => 'index'}, 
    :html => {:method => 'get'} do |f| %> 

    <%= text_field_tag :query %> 
    <%= f.label :category_id, "Category" %> 
    <%= f.collection_select :category_id, Category.all, 
         :id, :name, 
         {:prompt => 'All'} %> 
    <br/> 
    <%= f.submit "Search" %> 
<% end %> 

我得到这个错误：

ArgumentError in HomeController#index wrong number of arguments (1 for 2)

...

请求

参数：

{"utf8"=>"✓","query"=>"test","search_by_category"=>{"category_id"=>"2"},"commit"=>"Search"} 

我明白，这个问题是在这一行：

@contact_infos = ContactInfo.search_by_category(params[:query]) 

但我不知道如何从视图（home \ index.html.erb）传递这两个变量。

谢谢！

Answer 1

好的 - 我想通了。如果它可以帮助别人....

在模型contact_info.rb

class ContactInfo < ActiveRecord::Base 
    include PgSearch 

... 
    pg_search_scope :search_by_category, :against => :previous_value 
    scope :in_category, lambda { |category_id| 
    where(:category_id => category_id) 
    } 
end 

在控制器home_controller.rb

class HomeController < ApplicationController 
    def index 

    if params[:search_by_category].nil? 
    @contact_infos = ContactInfo.search(params[:query]) 
    else 
    tmp = params[:search_by_category] 
    @contact_infos = ContactInfo.search_by_category(params[:query]).in_category(tmp[:category_id]) 
    respond_to do |format| 
     format.html # index.html.erb 
     format.json { render json: @contact_infos } 
    end 
    end 
end 
end 

在视图家里\ index.html.erb

... 
    <%= form_for :search_by_category, :url => {:controller => 'home', :action => 'index'}, :html => {:method => 'get'} do |f| %> 
    <%= text_field_tag :query %> 
    <%= f.label :category_id, "Category" %> 
    <%= f.collection_select :category_id, Category.all, 
          :id, :name, 
          {:prompt => 'All'} %> 
    <br/> 
    <%= f.submit "Search" %> 
<% end %> 
...