add default exceptions to relations, test one argument, test querysetproxy, test deeply nested

README.md

@@ -437,8 +437,8 @@ metadata.drop_all(engine)
 *  `bulk_update(objects: List[Model], columns: List[str] = None) -> None`
 *  `delete(each: bool = False, **kwargs) -> int`
 *  `all(**kwargs) -> List[Optional[Model]]`
-*  `filter(**kwargs) -> QuerySet`
-*  `exclude(**kwargs) -> QuerySet`
+*  `filter(*args, **kwargs) -> QuerySet`
+*  `exclude(*args, **kwargs) -> QuerySet`
 *  `select_related(related: Union[List, str]) -> QuerySet`
 *  `prefetch_related(related: Union[List, str]) -> QuerySet`
 *  `limit(limit_count: int) -> QuerySet`
@@ -453,7 +453,7 @@ metadata.drop_all(engine)
 #### Relation types
 
 *  One to many  - with `ForeignKey(to: Model)`
-*  Many to many - with `ManyToMany(to: Model, through: Model)`
+*  Many to many - with `ManyToMany(to: Model, Optional[through]: Model)`
 
 #### Model fields types
 
@@ -491,8 +491,8 @@ The following keyword arguments are supported on all field types.
 All fields are required unless one of the following is set:
 
   * `nullable` - Creates a nullable column. Sets the default to `None`.
-  * `default` - Set a default value for the field.
-  * `server_default` - Set a default value for the field on server side (like sqlalchemy's `func.now()`).
+  * `default` - Set a default value for the field. **Not available for relation fields**
+  * `server_default` - Set a default value for the field on server side (like sqlalchemy's `func.now()`). **Not available for relation fields**
   * `primary key` with `autoincrement` - When a column is set to primary key and autoincrement is set on this column. 
 Autoincrement is set by default on int primary keys. 
   * `pydantic_only` - Field is available only as normal pydantic field, not stored in the database.