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התיעוד של RaamTrade
פתיחת RaamTrade

RC2_STATE_NESTED

תוכן זה אינו זמין עדיין בשפה שלך.

Nested collections are not allowed in persistent-state literals.

What it means

A class-body list or dict literal contained another collection — a list element that was itself a list or dict, or a dict value that was. Persistent-state collections are one level deep, holding a single scalar type (int, decimal, bool, or string).

Why it happens

class Bad(Strategy):
    trade = Symbol()
    sizing = FixedCapital()


    matrix = [[1, 2], [3, 4]]              # ❌ list of lists


    def execute(self):
        if self.trade.is_flat:
            self.buy(self.trade)

{"asian": [0.0, 0.0]} (dict of list) and {"limits": {"max": 100}} (dict of dict) are the same rejection.

How to fix it

Flatten. Parallel collections, or flat named keys, cover almost every real case:

class Good(Strategy):
    trade = Symbol()
    sizing = FixedCapital()


    # Was: sessions = {"asian": [0.0, 0.0], "london": [0.0, 0.0]}
    session_highs = {"asian": 0.0, "london": 0.0, "ny": 0.0}
    session_lows = {"asian": 999999.0, "london": 999999.0, "ny": 999999.0}


    def execute(self):
        if self.trade.high > self.session_highs["asian"]:
            self.session_highs["asian"] = self.trade.high
        if self.trade.is_flat:
            self.buy(self.trade)

Or two index-paired lists, when the position is the natural identifier:

class Paired(Strategy):
    trade = Symbol()
    sizing = FixedCapital()


    highs = [0.0]*5
    lows = [999999.0]*5


    def execute(self):
        if self.trade.high > self.highs[0]:
            self.highs[0] = self.trade.high
        if self.trade.low < self.lows[0]:
            self.lows[0] = self.trade.low
        if self.trade.is_flat:
            self.buy(self.trade)