remove custom json serializer

api/models/designer.py

@@ -1,9 +1,15 @@
 from api import db
-from api.helpers import JsonSerializer
 
-class Designer(JsonSerializer, db.Model):
+class Designer(db.Model):
   __tablename__ = 'designers'
 
-  designerid = db.Column('designerid', db.Integer, primary_key=True)
+  designerid = db.Column(db.Integer, primary_key=True)
   name = db.Column(db.String(100), nullable=False)
-  path = db.Column(db.String(100), nullable=False)
+  path = db.Column(db.String(100), nullable=False)
+
+  def to_json(self, nested=False):
+    return {
+      'designerid': self.designerid,
+      'name': self.name,
+      'path': self.path,
+    }