TradingView利差品种报错Cannot get a 'ticker' of a spread symbol求助

错误原因 #

利差（spread）类型标的不支持syminfo.ticker属性调用，你当前代码无论标的类型，都会先执行syminfo.prefix+":"+syminfo.ticker的拼接逻辑，所以遇到利差品种时直接触发报错，和后续的条件判断逻辑无关。

修复方案 #

利用Pine Script三元运算符的惰性求值特性，仅在非利差标的时执行标的代码拼接和security请求，利差品种直接返回当前图表的OHLC数据即可，完全规避对syminfo.ticker的无效调用。

修复后完整代码 #

//@version=4
study("spread", overlay=true)

var float close_lock    = na
var float open_lock     = na
var float high_lock     = na
var float low_lock      = na

// 仅非利差标的时执行security请求，利差标的直接取当前OHLC
[o, h, l, c] = syminfo.type != 'spread' ? security(syminfo.prefix+":"+syminfo.ticker , timeframe.period , [open, high, low, close] ,barmerge.gaps_off, barmerge.lookahead_on) : [open, high, low, close]

if (syminfo.type != 'spread')
    close_lock   := c
    open_lock    := o
    high_lock    := h
    low_lock     := l
else
    close_lock   := close 
    open_lock    := open 
    high_lock    := high 
    low_lock     := low 

plot(close_lock)

验证效果 #

• 普通标的切换至HA、Renko、Kagi等特殊图表类型时，仍可正常获取原生K线的OHLC数据
• 利差品种运行时无报错，直接调用当前图表自带的OHLC数据，符合需求

内容的提问来源于stack exchange，提问作者rohan sawant