Validation error changed from djago to REST framework to prevent crashs

Errors are returned as JSON when used with API

rex/models/module/scholarship.py

 from django.db import models
 from rex.models.module import BasicModule
 from rex.models.tools import Currency
-from django.core.exceptions import ValidationError
+from rest_framework import serializers
 from django.core.validators import MinValueValidator
 
 
@@ -24,7 +24,7 @@ class Scholarship(BasicModule):
     # Need custom validation
     def clean(self, *args, **kwargs):
         if self.amount_max < self.amount_min:
-            raise ValidationError(
+            raise serializers.ValidationError(
                 "Amount_max should be greater or equal than amount_min")
         super(Scholarship, self).clean(*args, **kwargs)
 

rex/models/tools/usefullLinksField.py

 from django.contrib.postgres.fields import JSONField
-from django.core.exceptions import ValidationError
-
 from rest_framework import serializers
 from rex.models.tools.validateWithRestFramework import validate_with_rest_framework
 
@@ -21,7 +19,8 @@ def validate_usefull_links(value):
     """
 
     if type(value) is not list:
-        raise ValidationError("Usefull links must be a JSON array !")
+        raise serializers.ValidationError(
+            "Usefull links must be a JSON array !")
 
     for obj in value:
         validate_with_rest_framework(UrlAndDescriptionSerializer, obj)

rex/models/tools/validateWithRestFramework.py

-from django.core.exceptions import ValidationError
+from rest_framework import serializers
 
 
 def validate_with_rest_framework(serializer, value):
@@ -10,11 +10,12 @@ def validate_with_rest_framework(serializer, value):
 
     valid_ser = serializer(data=value)
     if not valid_ser.is_valid():
-        raise ValidationError(str(valid_ser.errors))
+        raise serializers.ValidationError(str(valid_ser.errors))
 
     # Also checks that no extra fields were added
     if type(value) is not list:
         allowed_keys = list(valid_ser.get_fields())
         for key in value.keys():
             if key not in allowed_keys:
-                raise ValidationError("Expected JSON schema not respected")
+                raise serializers.ValidationError(
+                    "Expected JSON schema not respected")