Person and organization deletion (refs #1675)

* add associated actions, wizards, forms
* prevent deletion of associted items (operations, files, etc.)
* give list of associated items before deletion and give access to these
  items

1 files changed, 14 insertions, 7 deletions

diff --git a/archaeological_files/models.py b/archaeological_files/models.py
index 5138731d5..297a23fed 100644
--- a/archaeological_files/models.py
+++ b/archaeological_files/models.py
@@ -73,12 +73,17 @@ class File(BaseHistorizedItem, OwnPerms, ValueGetter):
     file_type = models.ForeignKey(FileType, verbose_name=_(u"File type"))
     in_charge = models.ForeignKey(Person, related_name='file_responsability',
                                   verbose_name=_(u"Person in charge"),
-                                            blank=True, null=True)
-    general_contractor = models.ForeignKey(Person, related_name='+',
-               verbose_name=_(u"General contractor"), blank=True, null=True)
+                                  on_delete=models.SET_NULL,
+                                  blank=True, null=True)
+    general_contractor = models.ForeignKey(Person,
+               related_name='general_contractor',
+               verbose_name=_(u"General contractor"), blank=True, null=True,
+               on_delete=models.SET_NULL,)
     responsible_town_planning_service = models.ForeignKey(Person,
-               related_name='+', blank=True, null=True,
-               verbose_name=_(u"Responsible for town planning service"))
+               related_name='responsible_town_planning_service',
+               blank=True, null=True,
+               verbose_name=_(u"Responsible for town planning service"),
+               on_delete=models.SET_NULL,)
     permit_type = models.ForeignKey(PermitType, verbose_name=_(u"Permit type"),
                                                           blank=True, null=True)
     permit_reference = models.CharField(_(u"Permit reference"),
@@ -116,9 +121,11 @@ class File(BaseHistorizedItem, OwnPerms, ValueGetter):
                           related_name='+', null=True, blank=True,
                           verbose_name=_(u"Requested operation type"))
     organization = models.ForeignKey(Organization, blank=True, null=True,
-                          verbose_name=_(u"Organization"))
+                          verbose_name=_(u"Organization"),
+                          related_name='files',
+                          on_delete=models.SET_NULL)
     scientist = models.ForeignKey(Person, blank=True, null=True,
-                    related_name='+',
+                    related_name='scientist', on_delete=models.SET_NULL,
                     verbose_name=_(u"Scientist in charge"))
     research_comment = models.TextField(_(u"Research archaeology comment"),
                                         null=True, blank=True)