Add humanized "last seen X ago" and "registered X ago" text on profile

Pipfile

@@ -10,6 +10,7 @@ flask-login = "*"
 flask-sqlalchemy = "*"
 pytz = "*"
 faker = "*"
+humanize = "*"
 
 [dev-packages]
 

Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "274a5de62926ba1c658817a40cb4b731272e26e154ce7a4a3b2f2095805a5dde"
+            "sha256": "d91ae74e8b4c1a9e9603e27dbdddd314ae6a462649cbff848d12c89ac84b0034"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -125,6 +125,14 @@
             "markers": "python_version >= '3' and platform_machine == 'aarch64' or (platform_machine == 'ppc64le' or (platform_machine == 'x86_64' or (platform_machine == 'amd64' or (platform_machine == 'AMD64' or (platform_machine == 'win32' or platform_machine == 'WIN32')))))",
             "version": "==1.1.2"
         },
+        "humanize": {
+            "hashes": [
+                "sha256:8d86333b8557dacffd4dce1dbe09c81c189e2caf7bb17a970b2212f0f58f10f2",
+                "sha256:ee1f872fdfc7d2ef4a28d4f80ddde9f96d36955b5d6b0dac4bdeb99502bddb00"
+            ],
+            "index": "pypi",
+            "version": "==4.0.0"
+        },
         "itsdangerous": {
             "hashes": [
                 "sha256:2c2349112351b88699d8d4b6b075022c0808887cb7ad10069318a8b0bc88db44",

models.py

@@ -1,7 +1,13 @@
+import datetime
+import json
+from typing import List
+
+import humanize
 from flask_login import UserMixin
 from sqlalchemy import func
 
 from .create_app import db
+MAXIMUM_ONLINE_DELTA = datetime.timedelta(minutes=5)
 
 
 class User(UserMixin, db.Model):
@@ -14,6 +20,16 @@ class User(UserMixin, db.Model):
     last_seen = db.Column(db.DateTime, nullable=False, server_default=func.now())
     last_ip = db.Column(db.String(64), nullable=True)
 
+    def get_last_seen(self) -> str:
+        delta: datetime.timedelta = datetime.datetime.utcnow() - self.last_seen
+        if delta > MAXIMUM_ONLINE_DELTA:
+            return f'Last seen {humanize.naturaldelta(delta)} ago'
+        return 'Online now!'
+
+    def get_registration_delta(self) -> str:
+        delta: datetime.timedelta = datetime.datetime.utcnow() - self.time_registered
+        return humanize.naturaldelta(delta)
+
 
 class Post(db.Model):
     id = db.Column(db.Integer, primary_key=True)
@@ -22,3 +38,18 @@ class Post(db.Model):
     date_posted = db.Column(db.DateTime, server_default=func.now())
     date_updated = db.Column(db.DateTime, nullable=True)
     likes = db.Column(db.Text, default='[]')
+
+    def get_likes(self) -> List[int]:
+        """Return the IDs of the Users who have liked this post."""
+        return json.loads(self.likes)
+
+    def set_likes(self, likes: List[int]) -> None:
+        """Set the likes c"""
+        self.likes = list(dict.fromkeys(json.dumps(likes)))
+        self.save()
+
+    def add_like(self, user_id: int) -> None:
+        likes: List[int] = self.get_likes()
+        if user_id not in likes:
+            likes.append(user_id)
+            self.set_likes(likes)

routes.py

@@ -41,6 +41,7 @@ def user(username: str):
     user = User.query.filter_by(username=username).first_or_404()
     return render_template('pages/user.html', user=user)
 
+
 @blueprint.route('/user/<username>/edit')
 @login_required
 def profile():

templates/pages/user.html

@@ -4,13 +4,19 @@
     <div class="content-inner">
         <div class="profile-title">
             <span class="profile-username">{{ user.username }}</span>
-            <span class="profile-timestamp online">Online Now!</span>
+            {% with seen_text = user.get_last_seen() %}
+                {% if seen_text == 'Online now!' %}
+                    <span class="profile-timestamp online">{{ seen_text }}</span>
+                {% else %}
+                    <span class="profile-timestamp offline">{{ seen_text }}</span>
+                {% endif %}
+            {% endwith %}
         </div>
         <div class="profile-lower">
             <div class="profile-left">
                 <img class="profile-picture" src="{{ url_for('static', filename='default_photo.png') }}" alt="{{ user.username }}'s Profile Picture">
                 <div class="profile-details">
-                    Registered 33 days ago<br>
+                    Registered {{ user.get_registration_delta() }} ago<br>
                     67 likes<br>
                     14 posts<br>
                 </div>