fix(trend): pass empty dict to ccxt create_order for DCA adds

Gate build_gate_order_params returns {} which is falsy; params or None broke trend_market_add with NoneType is not iterable while first-leg place_exchange_order worked.

Co-authored-by: Cursor <cursoragent@cursor.com>

strategy_config.py

@@ -105,7 +105,9 @@ def build_strategy_config(
             params = m.build_gate_order_params(direction, reduce_only=False)
         else:
             params = {}
-        return m.exchange.create_order(ex_sym, "limit", side, float(amount), float(price), params or None)
+        return m.exchange.create_order(
+            ex_sym, "limit", side, float(amount), float(price), params if params is not None else {}
+        )
 
     def replace_tpsl(ex_sym, direction, sl, tp, order_row):
         row = order_row or {"symbol": ex_sym, "exchange_symbol": ex_sym, "direction": direction}

strategy_trend_exchange.py

@@ -39,7 +39,8 @@ def trend_market_add(cfg: dict, exchange_symbol: str, direction: str, contracts:
         params = m.build_okx_order_params(direction, reduce_only=False)
     else:
         params = {}
-    return ex.create_order(exchange_symbol, "market", side, float(contracts), None, params or None)
+    order_params = params if params is not None else {}
+    return ex.create_order(exchange_symbol, "market", side, float(contracts), None, order_params)
 
 
 def trend_market_close(cfg: dict, exchange_symbol: str, direction: str, pos_qty: float, leverage: int):

tests/test_trend_market_add_params.py

@@ -0,0 +1,28 @@
+"""趋势补仓下单：空 params 不得变成 None（ccxt 会报 not iterable）。"""
+from __future__ import annotations
+
+import unittest
+from unittest.mock import MagicMock
+
+from strategy_trend_exchange import trend_market_add
+
+
+class TestTrendMarketAddParams(unittest.TestCase):
+    def test_empty_gate_params_not_passed_as_none(self):
+        ex = MagicMock()
+        ex.create_order.return_value = {"id": "1", "average": 0.34}
+        app = MagicMock()
+        app.exchange = ex
+        app.ensure_markets_loaded = MagicMock()
+        app.build_gate_order_params = MagicMock(return_value={})
+        cfg = {"app_module": app}
+
+        trend_market_add(cfg, "ONDO/USDT:USDT", "long", 23, 10)
+
+        args = ex.create_order.call_args
+        self.assertEqual(args[0][5], {})
+        self.assertIsNotNone(args[0][5])
+
+
+if __name__ == "__main__":
+    unittest.main()