Implements automatic concatenation fieldtype

EditorialModel/fieldtypes/concat.py

@@ -0,0 +1,16 @@
+#-*- coding: utf-8 -*-
+
+from . import char
+
+class EmFieldType(char.EmFieldType):
+    help = 'Automatic string field, defined as concatenation of other fields'
+
+    def __init__(self, field_list, max_length, **kwargs):
+        self._field_list = field_list
+        super().__init__(internal='automatic', max_length = max_length)
+
+    def _construct_data(self, lec, fname, datas, cur_value):
+        ret = ''
+        for fname in self._field_list:
+            ret += datas[fname]
+        return ret

EditorialModel/fieldtypes/regexchar.py

@@ -17,7 +17,7 @@ class EmFieldType(char.EmFieldType):
         self.compiled_re = re.compile(regex)  # trigger an error if invalid regex
 
 
-        super(EmFieldType, self).__init__(check_data_value=check_value, max_length=max_length, **kwargs)
+        super().__init__(check_data_value=check_value, max_length=max_length, **kwargs)
 
     def _check_data_value(self,value):
         error = None