new librarian sub-module: custom pdfs

[wolnelektury.git] / apps / catalogue / fields.py

diff --git a/apps/catalogue/fields.py b/apps/catalogue/fields.py
index 11c730c..0488244 100644 (file)
--- a/apps/catalogue/fields.py
+++ b/apps/catalogue/fields.py
@@ -3,9 +3,11 @@
 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
 #
 import datetime
+from functools import wraps
 
 from django.conf import settings
 from django.db import models
+from django.db.models.fields.files import FieldFile
 from django.db.models import signals
 from django import forms
 from django.forms.widgets import flatatt
@@ -14,7 +16,6 @@ from django.utils import simplejson as json
 from django.utils.html import escape
 from django.utils.safestring import mark_safe
 from django.utils.translation import ugettext_lazy as _
-from south.modelsinspector import add_introspection_rules
 
 
 class JSONEncoder(json.JSONEncoder):
@@ -53,7 +54,7 @@ class JSONField(models.TextField):
         defaults.update(kwargs)
         return super(JSONField, self).formfield(**defaults)
 
-    def db_type(self):
+    def db_type(self, connection):
         return 'text'
 
     def get_internal_type(self):
@@ -70,8 +71,6 @@ class JSONField(models.TextField):
             return setattr(model_instance, self.attname, dumps(json))
         setattr(cls, 'set_%s_value' % self.name, set_value)
 
-add_introspection_rules([], ["^catalogue\.fields\.JSONField"])
-
 
 class JQueryAutoCompleteWidget(forms.TextInput):
     def __init__(self, source, options=None, *args, **kwargs):
@@ -115,15 +114,31 @@ class JQueryAutoCompleteField(forms.CharField):
 
         super(JQueryAutoCompleteField, self).__init__(*args, **kwargs)
 
+
+class OverwritingFieldFile(FieldFile):
+    """
+        Deletes the old file before saving the new one.
+    """
+
+    def save(self, name, content, *args, **kwargs):
+        leave = kwargs.pop('leave', None)
+        # delete if there's a file already and there's a new one coming
+        if not leave and self and (not hasattr(content, 'path') or
+                                   content.path != self.path):
+            self.delete(save=False)
+        return super(OverwritingFieldFile, self).save(
+                name, content, *args, **kwargs)
+
+
+class OverwritingFileField(models.FileField):
+    attr_class = OverwritingFieldFile
+
+
 try:
     # check for south
     from south.modelsinspector import add_introspection_rules
 
-    add_introspection_rules([
-    (
-        [JSONField], # Class(es) these apply to
-        [], # Positional arguments (not used)
-        {}, # Keyword argument
-    ), ], ["^catalogue\.fields\.JSONField"])
+    add_introspection_rules([], ["^catalogue\.fields\.JSONField"])
+    add_introspection_rules([], ["^catalogue\.fields\.OverwritingFileField"])
 except ImportError:
     pass