Question

我想从与记录模型相关的模型，与模型相关的属性中找到一条记录。

我有一个VendorOrder模型，并希望通过搜索VendorOrder来找到一个vendor_order.order.shipments.each {|shipment| shipment.shipping_label.tracking_number}（或符合条件的vendor_orders）。因此，搜索跟踪号。

型号：

VendorOrder

  belongs_to :order
  has_many :shipments

Order

  has_many :vendor_orders
  has_many :shipments
  has_many :shipping_labels

Shipment

  belongs_to :order
  belongs_to :vendor_order
  belongs_to :shipping_label

ShippingLabel

  belongs_to :order
  has_one :shipment

我在控制器中

@vendor_orders = VendorOrder.joins(:order).merge(Order.where(order_status: "paid")).order(created_at: :desc).paginate(page: params[:vendor_page], per_page: 25)

    if params[:search]
      @vendor_orders = VendorOrder.search(params[:search])
    else
      @vendor_orders = VendorOrder.joins(:order).merge(Order.where(order_status: "paid")).order(created_at: :desc).paginate(page: params[:vendor_page], per_page: 25)
    end

在VendorOrder模型中，

def self.search(search)
    if search
      find(:all, :conditions => ['shipments.map {|shipment| shipment.shipping_label.tracking_number} LIKE ?', "%#{search}%"])
    else
      find(:all)
    end
  end

查看：

<%= form_tag vendor_orders_path, :method => 'get' do %>
  <p>
    <%= text_field_tag :search, params[:search] %>
    <%= submit_tag "Search", :name => nil %>
  </p>
<% end %>

错误：

Couldn't find all VendorOrders with 'id': (all, {:conditions=>["shipments.map {|shipment| shipment.shipping_label.tracking_number} LIKE ?", "%99999999999999999999%"]}) (found 0 results, but was looking for 2).):

很显然，我并没有完全理解它是如何工作的。到目前为止，我只制作了搜索表单，其中在一个模型内搜索字符串。

如何搜索多层模型，但要确保要搜索的是VendorOrder前端模型？

更新：

使用速成帖：

正在做

在模型中：

class << self

    def find_by_tracking_number(tracking_number)
      joins(:shipments).
        where(shipments: {
          id: Shipment.find_by(
            shipping_label: ShippingLabel.where(tracking_number: tracking_number)
          )
        })
    end

  end

控制器：

@vendor_orders = VendorOrder.joins(:order).merge(Order.where(order_status: "paid")).order(created_at: :desc).paginate(page: params[:vendor_page], per_page: 25)

    if params[:search]
      @vendor_orders = VendorOrder.find_by_tracking_number(params[:search])
    else
      @vendor_orders =  VendorOrder.
                          joins(:order).
                          merge(Order.where(order_status: "paid")).
                          order(created_at: :desc).
                          paginate(page: params[:vendor_page], per_page: 25)
    end

致力于使一切正常运行，但是我遇到了没有结果的问题。

输入数字“ 99999999999999999999”应获得约10个结果，但出现0。

提交时

Parameters: {"utf8"=>"✓", "search"=>"99999999999999999999"}

发挥了魔力：

SELECT  "shipments".* FROM "shipments" WHERE "shipments"."shipping_label_id" IN (SELECT "shipping_labels"."id" FROM "shipping_labels" WHERE "shipping_labels"."tracking_number" = $1) LIMIT $2[0m  [["tracking_number", "99999999999999999999"], ["LIMIT", 1]]

但是之后什么也没有，它只是呈现页面。

目前，大约有10个VendorOrders的shipments.map { |shpiment| shipment.shipping_label.tracking_number } ==“ 99999999999999999999”

为什么什么也没出现？我的代码中缺少一些内容来追加所有结果吗？

Answer 1

尝试一下：

<form onSubmit="App.retrieveTransaction();" class="form2">

              <h1 class="text-center">Retrieve transactions</h1>
              <div class="form-group">
                <label for="enterregnoselect">Reg No:</label><input id ="enterregnoselect" class="form-control" type ="text" required/>
              </div>

              <button type="submit" class="btn btn-primary" >Retrieve</button>
              <hr /> 

              <table class="table">
                  <thead>
                    <tr>
                      <th scope="col">Date</th>
                      <th scope="col">Name</th>
                      <th scope="col">Item</th>
                      <th scope="col">Credit</th>
                      <th scope="col">Debit</th>
                      <th scope="col">Price</th>
                      <th scope="col">Qty</th>
                    </tr>
                  </thead>
                  <tbody id="userResults">
                  </tbody>
                </table>
                <hr/>
              </form>

要进行细分，请假定您的跟踪号位于名为retrieveTransaction: function() { var transactionInstance; var enteredregno = $('#enterregnoselect').val(); // var enteredregno = "0015/55"; App.contracts.Payment.deployed().then(function(instance) { transactionInstance = instance; return transactionInstance.transactionCount(); }).then(function(transactionCount) { var userResults = $("#userResults"); userResults.empty(); for (var i = 1; i <= transactionCount; i++) { transactionInstance.transactions(i).then(function(transaction) { var date = transaction[0]; var regno = transaction[1]; var name = transaction[2]; var item = transaction[3]; var credit = transaction[4]; var debit = transaction[5]; var price = transaction[6]; var qty = transaction[7]; if(enteredregno == regno) { var userTemplate = "<tr><th>" + date + "</th><td>" + name + "</td><td>" + item + "</td></tr>" + credit + "</th><td>" + debit + "</td><td>" + price + "</td></tr>" + qty + "</td></tr>"; userResults.append(userTemplate); } }); } });的变量中。这个：

VendorOrder.
  joins(:shipments).
  where(shipments: {
    id: Shipment.find_by(shipping_label: ShippingLabel.find_by(tracking_number: @tracking_number))
  })

...将找到您的@tracking_number。而且：

ShippingLabel.find_by(tracking_number: @tracking_number)

...将找到ShippingLabel和Shipment.find_by(shipping_label: ShippingLabel.find_by(tracking_number: @tracking_number))到Shipment。

然后，按照指南的Specifying Conditions on the Joined Table部分，从上至上给出最终查询。

您可以在控制器中使用类似

belongs_to

或者，您可以（部分）将其放入ShippingLabel模型中，例如：

if params[:search]
  @vendor_orders =  VendorOrder.
                      joins(:shipments).
                      where(shipments: {
                        id: Shipment.find_by(
                          shipping_label: ShippingLabel.find_by(
                            tracking_number: params[:search]
                          )
                        )
                      })
else
  @vendor_orders =  VendorOrder.
                      joins(:order).
                      merge(Order.where(order_status: "paid")).
                      order(created_at: :desc).
                      paginate(page: params[:vendor_page], per_page: 25)
end

然后您可以在控制器中使用它，例如：

VendorOrder

IMO，这似乎更好一些，并且对控制器隐藏了一些复杂性。

搜索与联接相关的表单属性

更新：

1 个答案: