bugfix: use ldp models

djangoldp_invoice/models.py

 # -*- coding: utf-8 -*-
 from django.conf import settings
 from django.db import models
+from djangoldp.models import Model
 from  djangoldp_project.models import Customer
 from  djangoldp_project.models import Project
 from django.db.models import Sum
 import datetime
 from decimal import Decimal
 
-class FreelanceInvoice(models.Model):
+class FreelanceInvoice(Model):
     # customer = models.ForeignKey(User, on_delete=models.CASCADE)
     # provider = models.ForeignKey(User, on_delete=models.CASCADE)
     STATES = (
@@ -41,7 +42,7 @@ class FreelanceInvoice(models.Model):
 
 
 
-class CustomerInvoice(models.Model):
+class CustomerInvoice(Model):
     customer = models.ForeignKey(Customer, on_delete=models.DO_NOTHING, null=True)
     project = models.ForeignKey(Project, on_delete=models.DO_NOTHING, null=True)
     STATES = (
@@ -77,7 +78,7 @@ class CustomerInvoice(models.Model):
         return '{} - {} ({})'.format(self.identifier, self.title, self.htAmount())
 
 # Lot =========================================================
-class Batch(models.Model):
+class Batch(Model):
     invoice = models.ForeignKey(CustomerInvoice, on_delete=models.CASCADE, related_name='batches')
     title = models.CharField(max_length=255)
     creationDate = models.DateField(auto_now_add=True)
@@ -100,7 +101,7 @@ class Batch(models.Model):
 
 Batch._meta.serializer_fields = ['@id', 'invoice', 'title', 'htAmount', 'tasks']
 
-class Task(models.Model):
+class Task(Model):
     batch = models.ForeignKey(Batch, on_delete=models.CASCADE, related_name='tasks')
     title = models.CharField(max_length=255)
     htAmount = models.DecimalField(max_digits=11, decimal_places=2)