`load_node_with_all_properties` fails for model with disk property without unique fields or id

[Katarina Supe]

Community report - Discord

When you create a Model with a disk property without unique fields or id it fails to load the node from load_node_with_all_properties. It does not seem to ignore the disk properties and they get added to the where clause.

Minimum reproducible example:

class TestNode(Node):
    #id: int = Field(1, unique=True, db=db)

    Table : int = Field(0, db=db)
    Table2 : int = Field(0, on_disk=True)

checksum = TestNode(Table2=17235).save(db)
checksum_db = TestNode(Table2=17235).load(db)
print(checksum_db)
Saves to sqlite but fails to load back with: Traceback (most recent call last):
  File "/home/ubuntu/mix-alchemy/test.py", line 105, in <module>
    checksum_db = TestNode(Table2=17235).load(db)
  File "/home/ubuntu/.local/lib/python3.8/site-packages/gqlalchemy/models.py", line 620, in load
    node = db.load_node(self)
  File "/home/ubuntu/mix-alchemy/test.py", line 89, in load_node
    result = self.load_node_with_all_properties(node)
  File "/home/ubuntu/.local/lib/python3.8/site-packages/gqlalchemy/vendors/database_client.py", line 224, in load_node_with_all_properties
    return self.get_variable_assume_one(results, "node") 
Back then, I got around the error by inheriting the Node class and overriding the method 
class NodeT(Node):

    #patching to fix on on_disk
    def _get_cypher_field_assignment_block(self, variable_name: str, operator: str) -> str:
            """Creates a cypher field assignment block joined using the operator
            argument.
            Example:
                self = {"name": "John", "age": 34}
                variable_name = "user"
                operator = " AND "

                returns:
                    "user.name = 'John' AND user.age = 34"
            """

            cypher_fields = []
            for field in self.fields:
                value = getattr(self, field)
                attributes = self.fields[field].field_info.extra
                if value is not None and not attributes.get("on_disk", False):
                    cypher_fields.append(f"{variable_name}.{field} = {self.escape_value(value)}")

            return " " + operator.join(cypher_fields) + " "

    def loads(self, db: "Database") -> List["Node"]:  # noqa F821

        node = db.load_node(self)
        for field in self.fields:
            setattr(self, field, getattr(node, field))
        self._id = node._id
        return self

Here's the fix - just follows what is used on the other methods:

def _get_cypher_field_assignment_block(self, variable_name: str, operator: str) -> str:
            """Creates a cypher field assignment block joined using the operator
            argument.
            Example:
                self = {"name": "John", "age": 34}
                variable_name = "user"
                operator = " AND "

                returns:
                    "user.name = 'John' AND user.age = 34"
            """

            cypher_fields = []
            for field in self.fields:
                value = getattr(self, field)
                attributes = self.fields[field].field_info.extra
                if value is not None and not attributes.get("on_disk", False):
                    cypher_fields.append(f"{variable_name}.{field} = {self.escape_value(value)}")

            return " " + operator.join(cypher_fields) + " "