fix merging non relation list fields

tests/test_queries/test_non_relation_fields_not_merged.py

@@ -0,0 +1,53 @@
+from typing import Dict, List, Optional
+
+import databases
+import pytest
+import sqlalchemy
+
+import ormar
+from tests.settings import DATABASE_URL
+
+database = databases.Database(DATABASE_URL)
+metadata = sqlalchemy.MetaData()
+
+
+class BaseMeta(ormar.ModelMeta):
+    metadata = metadata
+    database = database
+
+
+class Chart(ormar.Model):
+    class Meta(BaseMeta):
+        tablename = "authors"
+
+    id: int = ormar.Integer(primary_key=True)
+    datasets = ormar.JSON()
+
+
+class Config(ormar.Model):
+    class Meta(BaseMeta):
+        tablename = "books"
+
+    id: int = ormar.Integer(primary_key=True)
+    chart: Optional[Chart] = ormar.ForeignKey(Chart)
+
+
+@pytest.fixture(autouse=True, scope="module")
+def create_test_database():
+    engine = sqlalchemy.create_engine(DATABASE_URL)
+    metadata.drop_all(engine)
+    metadata.create_all(engine)
+    yield
+    metadata.drop_all(engine)
+
+
+@pytest.mark.asyncio
+async def test_list_field_that_is_not_relation_is_not_merged():
+    async with database:
+        chart = await Chart.objects.create(datasets=[{"test": "ok"}])
+        await Config.objects.create(chart=chart)
+        await Config.objects.create(chart=chart)
+
+        chart2 = await Chart.objects.select_related("configs").get()
+        assert len(chart2.datasets) == 1
+        assert chart2.datasets == [{"test": "ok"}]