Handle null comparisons and added order_by, limit and offset params t…

…o models finder methods

sqlorm/model.py

@@ -397,6 +397,9 @@ def find_all(
         with_rels=None,
         with_joins=None,
         with_lazy=False,
+        order_by=None,
+        limit=None,
+        offset=None,
         **cols,
     ) -> CompositeResultSet:
         where = SQL.And([])
@@ -407,6 +410,12 @@ def find_all(
         stmt = cls.select_from(with_rels=with_rels, with_joins=with_joins, with_lazy=with_lazy)
         if where:
             stmt = stmt.where(where)
+        if order_by:
+            stmt = stmt.order_by(order_by)
+        if limit:
+            stmt = stmt.limit(limit)
+        if offset:
+            stmt = stmt.offset(offset)
         return cls.query(stmt)
 
     @classmethod
@@ -416,6 +425,7 @@ def find_one(
         with_rels=None,
         with_joins=None,
         with_lazy=False,
+        order_by=None,
         **cols,
     ):
         where = SQL.And([])
@@ -426,6 +436,8 @@ def find_one(
         stmt = cls.select_from(with_rels=with_rels, with_joins=with_joins, with_lazy=with_lazy)
         if where:
             stmt = stmt.where(where)
+        if order_by:
+            stmt = stmt.order_by(order_by)
         return cls.query(stmt.limit(1)).first()
 
     @classmethod

sqlorm/sql.py

@@ -74,9 +74,13 @@ def __le__(self, other):
         return self.op("<=", other)
 
     def __eq__(self, other):
+        if other is None:
+            return SQL(self, "IS NULL")
         return self.op("=", other)
 
     def __ne__(self, other):
+        if other is None:
+            return SQL(self, "IS NOT NULL")
         return self.op("!=", other)
 
     def __gt__(self, other):