Question

我正在使用IF EXISTS (SELECT 1 FROM Users WHERE Reference='USR00000007') SELECT * FROM Users WHERE Reference='USR00000007' ELSE SELECT * FROM Staff WHERE Reference='USR00000007'; gem。

以下是我的代码段：

writeexcel

我收到以下错误：

nil的未定义方法`new'：NilClass（NoMethodError）

完整错误：

workbook = WriteExcel.new("graphTest.xls")

worksheet = workbook.add_worksheet(sheetname = "Test")

chart = workbook.add_chart(
  :type => "Chart::column",
  :name => "Chart",
  :embedded => 1
  )

如果我直接从找到here的gem文档中获取示例，为什么会收到此错误消息？

Answer 1

The，＆＃34; Gotcha，＆＃34;在您的代码段中找到column中Chart::column的大写：

chart = workbook.add_chart(
  :type => "Chart::Column", #capitalized
  :name => "Chart",
  :embedded => 1
  )

而不是

chart = workbook.add_chart(
  :type => "Chart::column", #all lowercase
  :name => "Chart",
  :embedded => 1
  )

无法将图表添加到Excel工作簿

1 个答案: