Cria stub para PK igual a zero

Signed-off-by: Luciano Almeida <lucianoalmeida@interlegis.leg.br>

legacy/migration.py

@@ -26,7 +26,7 @@ appconfs = [apps.get_app_config(n) for n in [
     'protocoloadm', ]]
 
 stubs_list = []
-
+stub_created = False
 name_sets = [set(m.__name__ for m in ac.get_models()) for ac in appconfs]
 
 # apps do not overlap
@@ -91,6 +91,9 @@ def warn(msg):
 
 
 def get_fk_related(field, value, label=None):
+    has_textfield = False
+    fields_dict = {}
+    global stub_created
     if value is not None:
         try:
             value = field.related_model.objects.get(id=value)
@@ -100,7 +103,26 @@ def get_fk_related(field, value, label=None):
                     field.name, value,
                     field.model.__name__, label or '---')
             if value == 0:
-                # we interpret FK == 0 as actually FK == NONE
+                # se FK == 0, criamos um stub e colocamos o valor DESCONHECIDO
+                # para qualquer TextField que possa haver
+                all_fields = field.related_model._meta.get_fields()
+                for related_field in all_fields:
+                    if related_field.get_internal_type() == 'TextField':
+                        fields_dict[related_field.name] = 'DESCONHECIDO'
+                        has_textfield = True
+                    elif related_field.get_internal_type() == 'CharField':
+                        fields_dict[related_field.name] = 'DESC'
+                        has_textfield = True
+                if has_textfield and field.null is False:
+                    if not stub_created:
+                        stub_created = mommy.make(field.related_model,
+                                                  **fields_dict)
+                        warn(msg + ' => STUB CREATED FOR NOT NULL FIELD')
+                        value = stub_created
+                    else:
+                        value = stub_created
+                        warn(msg + ' => USING STUB ALREADY CREATED')
+                else:
                     value = None
                     warn(msg + ' => using NONE for zero value')
             else:
@@ -163,7 +185,6 @@ class DataMigrator:
         for field in new._meta.fields:
             old_field_name = renames.get(field.name)
             field_type = field.get_internal_type()
-
             if old_field_name:
                 old_value = getattr(old, old_field_name)
                 if isinstance(field, models.ForeignKey):
@@ -219,6 +240,7 @@ class DataMigrator:
         legacy_model_name = self.model_renames.get(model, model.__name__)
         legacy_model = legacy_app.get_model(legacy_model_name)
         legacy_pk_name = legacy_model._meta.pk.name
+        global stub_created
 
         # Clear all model entries
         # They may have been created in a previous migration attempt
@@ -229,12 +251,14 @@ class DataMigrator:
             # There is no pk in the legacy table
             def save(new, old):
                 new.save()
+                stub_created = False
 
             old_records = iter_sql_records(
                 'select * from ' + legacy_model._meta.db_table, 'legacy')
         else:
             def save(new, old):
                 save_with_id(new, getattr(old, legacy_pk_name))
+                stub_created = False
 
             old_records = legacy_model.objects.all().order_by(legacy_pk_name)