如何解决在Rails中进行联合搜索
我正在Rails项目中进行简单的联合搜索。我要做的是根据用户在搜索框中输入的内容找到对项目的描述。我最常见的错误是:
Mysql2 :: Error:“ where子句”中的未知列“ item.description”:SELECT item_instances
。* FROM item_instances
内联接items
ON items
。{ {1}} = id
。item_instances
在item_id
处。item
='服务器'
search.html.erb页面如下:
description
item_instances.rb(模型)文件
<p>
Search results base on database field <span class='bold'><%= @columnType %></span>
with value: <span class='bold'><%= @search_value %> </span>
</p>
<p>Total Report Cost: <span class='bold'>$<%= @cost %><span></p>
<table class='reportTable'>
<thead>
<tr>
<th class='reportTableHeaderCell'>Inv number</th>
<th class='reportTableHeaderCell'>Description</th>
<th class='reportTableHeaderCell'>Serial</th>
<th class='reportTableHeaderCell'>PO number</th>
<th class='reportTableHeaderCell'>PO date</th>
<th class='reportTableHeaderCell'>Invoice</th>
<th class='reportTableHeaderCell'>Date Out</th>
<th class='reportTableHeaderCell'>Cost</th>
<th class='reportTableHeaderCell'>Acro</th>
</tr>
</thead>
<tbody>
<% @item_instances.each do |item_instance| %>
<tr class='searchTableRow'>
<td class='reportTableCell'><%= link_to item_instance.inv_number,edit_item_instance_path(item_instance) %></td>
<td class='reportTableCell'><%= item_instance.item.description %></td>
<td class='reportTableCell'><%= item_instance.serial %></td>
<td class='reportTableCell'><%= item_instance.po_number %></td>
<td class='reportTableCell'><%= item_instance.po_date %></td>
<td class='reportTableCell'><%= item_instance.invoice %></td>
<td class='reportTableCell'><%= item_instance.date_out %></td>
<td class='reportTableCell'><%= item_instance.cost %></td>
<td class='reportTableCell'><%= item_instance.acro %></td>
</tr>
<% end %>
</tbody>
</table>
项目模型:
class ItemInstance < ApplicationRecord
validates :inv_number,:serial,:cost,presence: true
belongs_to :item
scope :in_order,->{order(:description)}
# Named Scopes
scope :search_for_records_by_date,->(startDate,endDate) { where(date_out: startDate..endDate) }
scope :search_for_records_by_column_and_value,->(columnName,value) { where("#{columnName}": "#{value}") }
#I know something may be wrong in here.
scope :search_for_records_by_column_and_value_item_table,value) { where(item: "#{columnName}": "#{value}") }
end
item_instances控制器:
class Item < ApplicationRecord
validates :description,:list_price,presence: true
has_many :item_instances,dependent: :delete_all
scope :in_order,->{order(:description)}
scope :search_for_active_items,->(active) { where(active: active) }
scope :search_for_records_by_column_and_value_on_items,value) { where("#{columnName}": "#{value}") }
end
路线文件:
class ItemInstancesController < ApplicationController
def search
# Getting the params from what the user submitted
@columnType = params[:columnType]
@search_value = params[:search_value]
if @columnType == 'description'
# SIMPLE THINGS I've TRIED:
# @item_instances = ItemInstance.joins(:item).where(item: {description: "server"})
#@item_instances = ItemInstance.joins(:items)
#I TRIED THIS JUST TO SEE IF I COULD GET ANYTHING
@item_instances = ItemInstance.joins(:item).where(:item => {description: "server"})
#@item_instances = ItemInstance.joins(:item).search_for_records_by_column_and_value_item_table(@columnType,@search_value)
end
respond_to do |format|
format.html { render :search }
end
end
end
schema.rb文件:
Rails.application.routes.draw do
resources :item_instances
get '/report',to: 'item_instances#report'
get '/search',to: 'item_instances#search'
resources :items
get '/active',to: 'items#active'
# Route to the home page
root 'item_instances#home'
end
请让我知道是否还有其他需要。我浏览了多篇文章和stackoverflow帖子都没有运气。任何有帮助的都会感激。
解决方法
在您的item_instances_controller.rb中,用where条件的项目替换item。在有条件的地方,必须指定完整的表名以进行比较。
class ItemInstancesController < ApplicationController
def search
#yourcode
@item_instances = ItemInstance.joins(:item).where(:items => {description: "server"})
#yourcode
end
end
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。