Fix for a bug introduced in refactoring: customized pdfs were instantly deleted,...

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

diff --git a/apps/catalogue/fields.py b/apps/catalogue/fields.py
index 2c0c765..0488244 100644 (file)
--- a/apps/catalogue/fields.py
+++ b/apps/catalogue/fields.py
@@ -3,18 +3,19 @@
 # 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
-from django.forms.util import smart_unicode
+from django.utils.encoding import smart_unicode
 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):
@@ -38,7 +39,7 @@ def loads(str):
 
 class JSONFormField(forms.CharField):
     widget = forms.Textarea
-    
+
     def clean(self, value):
         try:
             loads(value)
@@ -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):
@@ -61,7 +62,7 @@ class JSONField(models.TextField):
 
     def contribute_to_class(self, cls, name):
         super(JSONField, self).contribute_to_class(cls, name)
-        
+
         def get_value(model_instance):
             return loads(getattr(model_instance, self.attname, None))
         setattr(cls, 'get_%s_value' % self.name, get_value)
@@ -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):
@@ -80,23 +79,23 @@ class JQueryAutoCompleteWidget(forms.TextInput):
         if options:
             self.options = dumps(options)
         super(JQueryAutoCompleteWidget, self).__init__(*args, **kwargs)
-    
+
     def render_js(self, field_id):
         source = "'%s'" % escape(self.source)
         options = ''
         if self.options:
             options += ', %s' % self.options
-        
+
         return u'$(\'#%s\').autocomplete(%s%s).result(autocomplete_result_handler);' % (field_id, source, options)
-    
+
     def render(self, name, value=None, attrs=None):
         final_attrs = self.build_attrs(attrs, name=name)
         if value:
             final_attrs['value'] = smart_unicode(value)
-        
+
         if not self.attrs.has_key('id'):
             final_attrs['id'] = 'id_%s' % name
-        
+
         html = u'''<input type="text" %(attrs)s/>
             <script type="text/javascript">//<!--
             %(js)s//--></script>
@@ -104,7 +103,7 @@ class JQueryAutoCompleteWidget(forms.TextInput):
                 'attrs' : flatatt(final_attrs),
                 'js' : self.render_js(final_attrs['id']),
             }
-        
+
         return mark_safe(html)
 
 
@@ -112,6 +111,34 @@ class JQueryAutoCompleteField(forms.CharField):
     def __init__(self, source, options=None, *args, **kwargs):
         if 'widget' not in kwargs:
             kwargs['widget'] = JQueryAutoCompleteWidget(source, options)
-        
+
         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([], ["^catalogue\.fields\.JSONField"])
+    add_introspection_rules([], ["^catalogue\.fields\.OverwritingFileField"])
+except ImportError:
+    pass