Add a forgotten file (namerelation)

EditorialModel/fieldtypes/namerelation.py

@@ -0,0 +1,24 @@
+#-*- coding: utf-8 -*-
+
+from EditorialModel import classtypes as lodelconst
+
+from . import char
+from .generic import FieldTypeError
+
+class EmFieldType(char.EmFieldType):
+    help = 'Only designed to handle relation_name field value'
+
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+
+    def check_data_consistency(self, lec, fname, datas):
+        # We are in a context where lec is a LeRelation child class
+        if lec.implements_lerel2type():
+            superior = datas[lodelconst.relation_superior]
+            if datas[fname] not in superior._linked_types.keys():
+                return FieldTypeError("Bad relation_name for rel2type %s : '%s'" % (lec.__name__, datas[fname]))
+        elif  (datas[fname] is not None) and len(datas[fname] > 0):
+            return FieldTypeError("No relation_name allowed for hierarchical relations")
+        return True
+            
+