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 e1a356e..0488244 100644 (file)
--- a/apps/catalogue/fields.py
+++ b/apps/catalogue/fields.py
@@ -1,10 +1,75 @@
 # -*- coding: utf-8 -*-
+# This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
+# 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.simplejson import dumps
+from django.utils.translation import ugettext_lazy as _
+
+
+class JSONEncoder(json.JSONEncoder):
+    def default(self, obj):
+        if isinstance(obj, datetime.datetime):
+            return obj.strftime('%Y-%m-%d %H:%M:%S')
+        elif isinstance(obj, datetime.date):
+            return obj.strftime('%Y-%m-%d')
+        elif isinstance(obj, datetime.time):
+            return obj.strftime('%H:%M:%S')
+        return json.JSONEncoder.default(self, obj)
+
+
+def dumps(data):
+    return JSONEncoder().encode(data)
+
+
+def loads(str):
+    return json.loads(str, encoding=settings.DEFAULT_CHARSET)
+
+
+class JSONFormField(forms.CharField):
+    widget = forms.Textarea
+
+    def clean(self, value):
+        try:
+            loads(value)
+            return value
+        except ValueError, e:
+            raise forms.ValidationError(_('Enter a valid JSON value. Error: %s') % e)
+
+
+class JSONField(models.TextField):
+    def formfield(self, **kwargs):
+        defaults = {'form_class': JSONFormField}
+        defaults.update(kwargs)
+        return super(JSONField, self).formfield(**defaults)
+
+    def db_type(self, connection):
+        return 'text'
+
+    def get_internal_type(self):
+        return '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)
+
+        def set_value(model_instance, json):
+            return setattr(model_instance, self.attname, dumps(json))
+        setattr(cls, 'set_%s_value' % self.name, set_value)
 
 
 class JQueryAutoCompleteWidget(forms.TextInput):
@@ -14,31 +79,31 @@ 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'$(\'#%s\').autocomplete(%s%s);' % (field_id, source, options)
-    
+
+        return u'$(\'#%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"><!--//
+            <script type="text/javascript">//<!--
             %(js)s//--></script>
             ''' % {
                 'attrs' : flatatt(final_attrs),
                 'js' : self.render_js(final_attrs['id']),
             }
-        
+
         return mark_safe(html)
 
 
@@ -46,6 +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