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    <p>You are creating your Blogger entity with a parent key that you are not specifying when you are trying to retrieve your post in your <code>DisplayPost</code>.</p> <p>An entity's key is composed of multiple parts. It's Kind (<code>"Blogger"</code>), it's ID (<code>int(post_id)</code>), and also it's ancestor, or parent.</p> <p>Because you create your entity with:</p> <pre><code>a = Blogger(parent = post_key(), name = name, content = content) </code></pre> <p>You need to specify the same parent when calling <code>get_by_id()</code> (<a href="https://developers.google.com/appengine/docs/python/ndb/modelclass#Model_get_by_id" rel="nofollow">see the get_by_id() docs</a>).</p> <p>Your solution will be to change</p> <pre><code>po = Blogger.get_by_id(int(post_id)) </code></pre> <p>to</p> <pre><code>po = Blogger.get_by_id(int(post_id), parent=post_key()) </code></pre> <p>Later, if you change the name of the blog (looking at the code for post_key()), then you'll need to carry that as an argument to the post display mechanism. (You might use a subdomain as the 'name' of the blog for example).</p> <hr> <p>Here is the previous answer that addressed issues with the regex URL mapping:</p> <p>In your <code>WSGIApplication</code> definition, you have <code>('/blog/([0-9]+)', DisplayPost)], debug=True)</code>.</p> <p>You are missing the <code>r</code> before the url string to identify the string as a <strong>regular expression</strong>:</p> <p><code>(r'/blog/([0-9]+), ....</code></p> <p>You also have the option to be more verbose with <strong>parameter naming</strong>:</p> <p><code>(r'/blog/&lt;post_id:([0-9]+)&gt;, ....</code></p> <p>Reference: <a href="http://webapp-improved.appspot.com/guide/routing.html" rel="nofollow">http://webapp-improved.appspot.com/guide/routing.html</a></p>
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    1. COJust to mention it, your regex of `[0-9]` could also be `\d`
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    2. COMade the necessary changes. However, I now get a 404 error when I submit a post and get redirected to the permalink. I have included the revised code above under the edited section.
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    3. COJudging by your code, I see a missing `>` in your regex. `r'/blog/<post_id:([0-9]+)'` to `r'/blog/<post_id:([0-9]+)>'`
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