Question

我有一个rails应用程序，我正在创建一个highcharts折线图来比较2个行业，电信和农业的股票，同时跟随this，ryan bates highstocks视频。

图表将在stock_quotes的index.html.erb视图中输出，其中highcharts的javascipt代码如下：

<div id="quotes_chart", style="width=560px; height:300px;">

  $(function(){   
  new HighCharts.Chart( 
  chart: {
    renderTo: "quotes_chart"
  },
  title: {
   text: "Daily trades" 
  },
  xAxis: {
   type: "datetime"
  },
  yAxis: {
   title: {
     text: "Shillings"
  }
},
tooltip: {
  formatter: function(){
    return HighCharts.dateFormat("%B %e, %Y", this.x) + ': ' + "Kshs" + Highcharts.numberFormat(this.y, 2);
  }
},
series: [
<% { "Telecommunication" => StockQuote.telecomm, "Agriculture" => StockQuote.agric }.each do |name, prices|
%>
{
  name: <%= name %>
  pointInterval: <%= 1.day * 1000 %>,
  pointStart: <%= 2.weeks.ago.to_i * 1000 %>,
  data: <%= (2.weeks.ago.to_date..Date.today).map { |date| StockQuote.price_on(date).to_f}.inspect%>
},
<% end %>]
  }); 
}); 
 </div>

模型 stock_quote.rb 如下：

scope :agric, where(category: "Agriculture")
scope :telecomm, where(category: "Telecommunication")

def self.price_on(date)
  where("date(published_at) = ?", date).sum(:total_price)
end

这是stock_quotes div上输出的内容：

$(function(){ new HighCharts.Chart( chart: { renderTo: "quotes_chart" }, title: { text: "Daily trades" }, xAxis: { type: "datetime" }, yAxis: { title: { text: "Shillings" } }, tooltip: { formatter: function(){ return HighCharts.dateFormat("%B %e, %Y", this.x) + ': ' + "Kshs" + Highcharts.numberFormat(this.y, 2); } }, series: [ { name: Telecommunication pointInterval: 86400000, pointStart: 1398157330000, data: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 554.0] }, { name: Agriculture pointInterval: 86400000, pointStart: 1398157330000, data: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 554.0] }, ] }); });

Answer 1

看rails 4 scope syntax 代替：

  scope :agric, where(category: "Agriculture")
  scope :telecomm, where(category: "Telecommunication")

使用：

  scope :agric, -> { where(category: "Agriculture") }
  scope :telecomm, -> { where(category: "Telecommunication") }

Answer 2

您的范围定义必须是proc对象，而不是plain where语句。这是因为它们需要在范围的实际查询期间进行评估，而不是在类的初始设置期间进行评估。因此，请在您的模型中使用它：

scope :agric, -> { where(category: "Agriculture") }
scope :telecomm, -> { where(category: "Telecommunication") }

Rails 4.0未定义方法`call'

2 个答案: