alternative image from other post

fet2020/posts/models.py

@@ -11,6 +11,9 @@ import re
 from rest_framework import serializers
 from django.db.models import Q
 
+import logging
+logger = logging.getLogger('posts')
+
 class PostManager(models.Manager):
     def get_queryset(self):
         return super().get_queryset()
@@ -80,11 +83,27 @@ class Post(models.Model):
         if self.image:
             return self.image.url
         else:
-            return ""
+            image=self.find_an_image()
+            if image:
+                return image.url
+            else:
+                return ""
 
     def key(self):
         return self.slug or self.id
 
+    def find_an_image(self):
+        "find an image via another post"
+        posts1=Post.objects.filter(slug__in=self.tags.names()).filter(image__isnull=False)[0:1].all() # Query all posts that have a slug that equals one of the tags
+        if len(posts1)>0:
+            return posts1.get().image
+        
+        posts2=self.tags.similar_objects()
+        for p in posts2:
+            if p.image is not None:
+                return p.image
+        return None
+        
     @property
     def url(self):
         return reverse('posts.show', kwargs={"id":self.slug})