fix a typo, update admin base classes

djangocms_blog/admin.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 from admin_enhancer.admin import EnhancedModelAdminMixin
-from cms.admin.placeholderadmin import PlaceholderAdmin, FrontendEditableAdmin
+from cms.admin.placeholderadmin import PlaceholderAdminMixin, FrontendEditableAdminMixin
 from copy import deepcopy
 from django.contrib import admin
 from django.conf import settings
@@ -23,8 +23,8 @@ class BlogCategoryAdmin(EnhancedModelAdminMixin, TranslatableAdmin):
         }
 
 
-class PostAdmin(EnhancedModelAdminMixin, FrontendEditableAdmin,
-                PlaceholderAdmin, TranslatableAdmin):
+class PostAdmin(EnhancedModelAdminMixin, FrontendEditableAdminMixin,
+                PlaceholderAdminMixin, TranslatableAdmin, admin.ModelAdmin):
     form = PostAdminForm
     list_display = ['title', 'author', 'date_published', 'date_published_end']
     date_hierarchy = 'date_published'

djangocms_blog/templates/djangocms_blog/post_detail.html

@@ -42,10 +42,10 @@
         <img src="{{ thumb.url }}" alt="{{ post.main_image.default_alt_text }}" width="{{ thumb.width }}" height="{{ thumb.height }}" />
     </div>
     {% endif %}
-	{% if use_placeholer %}
+	{% if use_placeholder %}
 		<div class="blog-content">{% render_placeholder post.content %}</div>
 	{% else %}
 		<div class="blog-content">{% render_model post "post_text" "post_text" %}</div>
 	{% endif %}
 </article>
-{% endspaceless %}{% endblock content_blog %}
+{% endspaceless %}{% endblock content_blog %}

djangocms_blog/views.py

@@ -50,7 +50,7 @@ class PostDetailView(TranslatableSlugMixin, BaseBlogView, DetailView):
     def get_context_data(self, **kwargs):
         context = super(PostDetailView, self).get_context_data(**kwargs)
         context['meta'] = self.get_object().as_meta()
-        context['use_placeholer'] = get_setting('USE_PLACEHOLDER')
+        context['use_placeholder'] = get_setting('USE_PLACEHOLDER')
         setattr(self.request, BLOG_CURRENT_POST_IDENTIFIER, self.get_object())
         return context