First implementations of the can_override method on the data_handler types

lodel/leapi/datahandlers/data_fields/text.py

@@ -4,7 +4,12 @@ from ..data_field import DataField
 
 class DataHandler(DataField):
     help = 'A text field (big string)'
-    ftype = 'text'
+    base_type = 'text'
 
     def __init__(self, **kwargs):
         super(self.__class__, self).__init__(ftype='text', **kwargs)
+
+    def can_override(self, data_handler):
+        if data_handler.__class__.base_type != self.__class__.base_type:
+            return False
+        return True

lodel/leapi/datahandlers/data_fields/uid.py

@@ -5,6 +5,7 @@ from .integer import EmDataField as IntegerDataField
 class DataHandler(IntegerDataField):
 
     help = 'Fieldtype designed to handle editorial model UID'
+    base_type = 'int'
 
     ## @brief A uid field
     # @param **kwargs
@@ -16,3 +17,8 @@ class DataHandler(IntegerDataField):
     def _check_data_value(self, value):
         return (value, None)
 
+    def can_override(self,data_handler):
+        if data_handler.__class__.base_type != self.__class__.base_type:
+            return False
+
+        return True

lodel/leapi/datahandlers/data_fields/varchar.py

@@ -3,10 +3,22 @@ from ..data_field import DataField
 
 
 class DataHandler(DataField):
+
     help = 'Basic string (varchar) field. Default size is 64 characters'
+    base_type = 'char'
 
     ## @brief A string field
     # @brief max_length int: The maximum length of this field
     def __init__(self, max_length=64, **kwargs):
         self.max_length = int(max_length)
         super().__init__(**kwargs)
+
+    def can_override(self, data_handler):
+
+        if data_handler.__class__.base_type != self.__class__.base_type:
+            return False
+
+        if data_handler.max_length != self.max_length:
+            return False
+
+        return True