How to request data from another security to show correctly with request.security() - Pine Script v5 - TradingView

Question

Does anyone know if it's possible to request string data using request.security() to get information on multiple symbols at the same time? The script I have compiles with no errors, but the problem is some of the data coming through in the alert message is for the main symbol and not for the security symbols. Example: If I set an alert and the symbol that happens to be on the chart at the time I created the alert, say AAPL, then every time the alert is triggered for any one of the symbols in the list (the "security symbols") it will show the exchange (syminfo.prefix) for AAPL every time and not for the symbols in the list, such as COINBASE:BTCUSD = NASDAQ.

I've tried everything I can think of, but cannot get the correct info to come through. Or I will get an error. This error comes up the most: "Type series__string cannot be used as tuple element in request.security 'expression' argument" and after reading the documentation I think I understand why I can't reqest string in tuple. So, is it even possible to request information like syminfo.prefix on multiple symbols?

Most of the script is from a TradingView blog post: https://www.tradingview.com/blog/en/our-new-alerts-allow-for-dynamic-messages-22588/

My Script:

//@version=5

indicator('trigger RSI alert for multiple symbols')

// Just testing to see if something like this would work
my_func(_ticker) =>
    dTicker = str.tostring(syminfo.ticker) + ' : '
    dTitle = str.tostring(syminfo.prefix)
    returnString = ' test ' + dTicker + dTitle 
    returnString

// Most of the following is from the TradingView blog post
f_triggerRsi(_ticker) =>
    _r = ta.rsi(close, 14)
    _x = ta.crossover(_r, 60)
    _y = ta.crossunder(_r, 40)
    _p = close
    _c = syminfo.prefix
    _rt = barstate.isrealtime
    _tn = timenow
    // Trying few things:
    //_s = syminfo.prefix (can't use string in tuple error message)  
    //_ts = timenow (doesn't work)
    //_j = str.split(syminfo.ticker, ":") 
    
    [_rsi, _co, _cu, _px, _rt_bar] = request.security(_ticker, timeframe.period, [_r, _x, _y, _p, _rt])
    _msg = _ticker + ', ' + timeframe.period + ': ' + 'Test: ' + my_func(_ticker) 
    if _co and _rt_bar
        _msg += 'RSI (' + str.tostring(_rsi) + ') crossing up 60 level ' + 'Price: ' + str.tostring(_px, "#.##") + 'Test1: ' + syminfo.prefix 
        alert(_msg, alert.freq_once_per_bar) 

    else if _cu and _rt_bar
        _msg += 'RSI (' + str.tostring(_rsi) + ')  crossing down 40 level ' + 'Price: ' + str.tostring(_px, "#.##") + 'Test2: ' + syminfo.prefix 
        alert(_msg, alert.freq_once_per_bar) 
       
// This script currently returns:
//  GOOD: ticker correctly with _ticker
//  GOOD: RSI value correctly with _rsi
//  GOOD: timeframe correctly (but it's inherantly correct)
//  BAD: exchange incorrectly, returns the exchange of the main symbol and not the value of the security symbols
//  BAD: timestamp is always the time of the main symbol not the security symbols 

// Data I need in the alert message
//  a) tickerid that triggered the alert (NASDAQ:AAPL, COINBASE:BTCUSD, etc.)
//  b) timeframe that the ticker is on (Daily, 30 Minute, etc.)
//  c) the exchange separately without the ticker (syminfo.prefix)
//  d) the symbol without the exchange (syminfo.ticker)
//  d) timestamp - the time the alert for the security tickerid was triggered at the exchange time

// Security Symbols 
f_triggerRsi(syminfo.tickerid) 
f_triggerRsi('NASDAQ:MSFT') 
f_triggerRsi('NYSE:PLTR')
f_triggerRsi('NASDAQ:AAPL')
f_triggerRsi('NASDAQ:DWAC')
f_triggerRsi('NASDAQ:PHUN')
f_triggerRsi('NASDAQ:SBEA')
f_triggerRsi('NASDAQ:SEAC')
f_triggerRsi('NASDAQ:CFVI')
f_triggerRsi('NASDAQ:MSFT')
f_triggerRsi('NASDAQ:NVDA')
f_triggerRsi('NASDAQ:FB')
f_triggerRsi('NASDAQ:AMD')
f_triggerRsi('NASDAQ:TSLA')
f_triggerRsi("COINBASE:BTCUSD")
f_triggerRsi("COINBASE:ETHUSD")
f_triggerRsi("COINBASE:LTCUSD")
f_triggerRsi("BINANCE:SOLUSDT")
f_triggerRsi("FTX:RAYUSD")
f_triggerRsi("BINANCE:ICPUSDT")

Answer 1

syminfo.* variables are linked to the current chart and it's not possible to pass it in a security function. You need to do a work around. Se code below as an exemple.

`
// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © Phwi
//@version=5
indicator("Get Prefix with out using syminfo.prefix", overlay = false)

comp_override = input(defval=false, title='Override Auto Detection of Index')
sym = input.symbol('OMXCOP:OMXC25', title='Index override')


f_BSMA(symbol) =>


    pos_start = str.pos(symbol, "")  // Get start position of ":" character
    pos_stop = str.pos(symbol, ":")  // Get position of ":" character. Stop position

    tkr= str.substring(symbol, pos_start, pos_stop) // Get Exchange
    
    ex = str.replace_all(str.replace_all(tkr, '_DLY', ''), '_DL', '')  // "_DLY" suffix in syminfo.prefix workaround

    //Get Indeks to compare to
    comparativeTickerId = comp_override and sym != '' ? sym : syminfo.type == 'index' ? 'NYSE:OOI' : syminfo.type == 'cfd' ? 'NYSE:OOI' : syminfo.type == 'forex' ? 'INDEX:DXY' : ex == 'LSE' ? 'UKXGBP' : ex == 'ASX' ? 'ASX:AST' : ex == 'OSL' ? 'OSL:OBX' : ex == 'OMXSTO' ? 'OMXSTO:OMXS30' : ex == 'OMXCOP' ? 'OMXCOP:OMXC25' : ex == 'OMXHEX' ? 'OMXHEX:OMXH25' : ex == 'OMXICE' ? 'OMXICE:OMXI10' : ex == 'XETR' ? 'XETR:DAX' : ex == 'FWB' ? 'XETR:DAX' : ex == 'SWB' ? 'XETR:DAX' : ex == 'EURONEXT' ? 'EURONEXT:PX1' : ex == 'EURONEXT' ? 'EURONEXT:AEX' : ex == 'EURONEXT' ? 'EURONEXT:BEL20' : ex == 'EURONEXT' ? 'EURONEXT:PSI20' : ex == 'DJCFD' ? 'AMEX:SPY' : ex == 'NYSE' ? 'AMEX:SPY' : ex == 'BATS' ? 'AMEX:SPY' : ex == 'NASDAQ' ? 'AMEX:SPY' : ex == 'OTC' ? 'AMEX:SPY' : sym  // last entry is the fallback, no match will default to the override ticker as comparison. by default OMXC25
  
   

    if barstate.islastconfirmedhistory
        label.new(bar_index, high, text =  comparativeTickerId)

   
f_BSMA(syminfo.tickerid)