Question

我是Rails的新手，学习使用Rails 4的Agile Web Development一书，并使用Rails版本4.2.4和Ruby版本2.1.5。我现在正处于迭代D3，我遇到了下面所述的错误：

ActiveRecord::RecordNotFound in LineItemsController#create
Couldn't find Product with 'id'=

Rails.root: c:/Ruby on Rails/Agile Rail Development/depot

Application Trace | Framework Trace | Full Trace<br>
app/controllers/line_items_controller.rb:29:in `create'

以下是图片的链接：Link to the error。

在这里，我将代码推送到GitHub：Link to the full code。

这是我的line_items_controller.rb文件。

class LineItemsController < ApplicationController
  include CurrentCart
  before_action :set_cart, only: [:create]
  before_action :set_line_item, only: [:show, :edit, :update, :destroy]

  def create
    product = Product.find(params[:product_id])
    @line_item = @cart.line_items.build(product: product)

    respond_to do |format|
      if @line_item.save
        format.html { redirect_to @line_item.cart, notice: 'Line item was successfully created.' }
        format.json { render :show, status: :created, location: @line_item }
      else
        format.html { render :new }
        format.json { render json: @line_item.errors, status: :unprocessable_entity }
      end
    end
  end

  private

    def set_line_item
      @line_item = LineItem.find(params[:id])
    end

    def line_item_params
      params.require(:line_item).permit(:product_id, :cart_id)
    end
end

非常感谢您的帮助，谢谢!!

Answer 1

没有params[:product_id]

使用此

product = Product.find(params[:line_item][:product_id])

Answer 2

错误可以在line_items <%= button_to 'Add to Cart', line_items_path(prodcut_id: product) %>视图中找到第34行 app / views / index.html.erb 。

你有一点错字：

product_id:

应该是prodcut_id:而不是<%= button_to 'Add to Cart', line_items_path(product_id: product) %>。

该行应如下所示：

<div class="panel panel-default">
  <div class="panel-heading">
    <h3 class="panel-title">Add a trip</h3>
  </div>
  <div class="panel-body">
    <div class="form-group">
        <label for="from">From</label> 
        <input type="text" class="form-control" id="from" name="from" placeholder="From" data-bind="value: from">
    </div>
    <div class="form-group">
        <label for="to">To</label> 
        <input type="text" class="form-control" id="to" name="to" placeholder="To" data-bind="value: to">
    </div>
    <a class="btn btn-primary btn-lg"  role="button" data-bind="click: add()" >Add</a>
  </div>
</div>


<div class="panel panel-default">
    <div class=panel-heading>Your trips</div>
    <table class=table>
        <thead>
            <tr>
                <th>From</th>
                <th>To</th>
            </tr>
        </thead>
        <tbody data-bind="foreach: records">
            <tr>
                <td data-bind="text: from"></td>
                <td data-bind="text: to"></td>
            </tr>
        </tbody>
    </table>
</div>


<script type="text/javascript" src="js/knockout-3.4.0.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>


<script type="text/javascript">
var AppViewModel = function() {
  this.from = ko.observable();
  this.to = ko.observable();
  this.records = ko.observableArray();

};
var model = new AppViewModel();


model.add = function() {
    model.records.push({ 
    from: model.from(),
    to: model.to()
  });


//sending data to server
   var data = 
            {
                from : this.from(), to : this.to(), date : this.date(),  price : this.price(), freeSeats : this.freeSeats()           
            }
            alert(data);

        $.post("/data", data, function(response)
        {

        })

}

ko.applyBindings(model);

</script>

<script>
    function tripModel() {
        this.records = ko.observableArray([]);

        $.getJSON("/usersTrips", function(data) {

          self.records(data);

        })
    }
    ko.applyBindings(new tripModel());
</script>

Rails 4.2.4 LineItemsController中的ActiveRecord :: RecordNotFound #create

2 个答案: