Glasgow | Prati Amalden | Module Legacy Code | New feature: unfollow

backend/data/follows.py

@@ -20,6 +20,19 @@ def follow(follower: User, followee: User):
             # Already following - treat as idempotent request.
             pass
 
+def unfollow(follower: User, followee: User):
+    with db_cursor() as cur:
+        try:
+            cur.execute(
+                "DELETE FROM follows WHERE follower = %(follower_id)s AND followee = %(followee_id)s",
+                dict(
+                    follower_id=follower.id,
+                    followee_id=followee.id,
+                ),
+            )
+        except Exception as err:
+            # handle unexpected errors.
+            pass
 
 def get_followed_usernames(follower: User) -> List[str]:
     """get_followed_usernames returns a list of usernames followee follows."""

backend/endpoints.py

@@ -1,6 +1,6 @@
 from typing import Dict, Union
 from data import blooms
-from data.follows import follow, get_followed_usernames, get_inverse_followed_usernames
+from data.follows import follow, unfollow, get_followed_usernames, get_inverse_followed_usernames
 from data.users import (
     UserRegistrationError,
     get_suggested_follows,
@@ -149,6 +149,22 @@ def do_follow():
         }
     )
 
+@jwt_required()
+def do_unfollow(unfollow_username):
+    current_user = get_current_user()
+    unfollow_user = get_user(unfollow_username)
+
+    if unfollow_user is None:
+        return make_response(
+            (f"Cannot unfollow {unfollow_username} - user does not exist", 404)
+        )
+
+    unfollow(current_user, unfollow_user)
+    return jsonify(
+        {
+            "success": True,
+        }
+    )
 
 @jwt_required()
 def send_bloom():

backend/main.py

@@ -4,6 +4,7 @@
 from data.users import lookup_user
 from endpoints import (
     do_follow,
+    do_unfollow,
     get_bloom,
     hashtag,
     home_timeline,
@@ -54,6 +55,7 @@ def main():
     app.add_url_rule("/profile", view_func=self_profile)
     app.add_url_rule("/profile/<profile_username>", view_func=other_profile)
     app.add_url_rule("/follow", methods=["POST"], view_func=do_follow)
+    app.add_url_rule("/unfollow/<unfollow_username>", methods=["POST"], view_func=do_unfollow)
     app.add_url_rule("/suggested-follows/<limit_str>", view_func=suggested_follows)
 
     app.add_url_rule("/bloom", methods=["POST"], view_func=send_bloom)

front-end/components/profile.mjs

@@ -19,6 +19,7 @@ function createProfile(template, {profileData, whoToFollow, isLoggedIn}) {
   );
   const followerCountEl = profileElement.querySelector("[data-follower-count]");
   const followButtonEl = profileElement.querySelector("[data-action='follow']");
+  const unfollowButtonEl = profileElement.querySelector("[data-action='unfollow']")
   const whoToFollowContainer = profileElement.querySelector(".profile__who-to-follow");
   // Populate with data
   usernameEl.querySelector("h2").textContent = profileData.username || "";
@@ -29,8 +30,15 @@ function createProfile(template, {profileData, whoToFollow, isLoggedIn}) {
   followButtonEl.setAttribute("data-username", profileData.username || "");
   followButtonEl.hidden = profileData.is_self || profileData.is_following;
   followButtonEl.addEventListener("click", handleFollow);
+
+  unfollowButtonEl.setAttribute("data-username", profileData.username || "");
+  unfollowButtonEl.hidden = profileData.is_self || !profileData.is_following;
+  unfollowButtonEl.addEventListener("click", handleUnfollow);
+
   if (!isLoggedIn) {
     followButtonEl.style.display = "none";
+    unfollowButtonEl.style.display = "none";
+
   }
 
   if (whoToFollow.length > 0) {
@@ -41,9 +49,10 @@ function createProfile(template, {profileData, whoToFollow, isLoggedIn}) {
       const usernameLink = wtfElement.querySelector("a[data-username]");
       usernameLink.innerText = userToFollow.username;
       usernameLink.setAttribute("href", `/profile/${userToFollow.username}`);
-      const followButton = wtfElement.querySelector("button");
+      const followButton = wtfElement.querySelector("button[data-action='follow']");
       followButton.setAttribute("data-username", userToFollow.username);
       followButton.addEventListener("click", handleFollow);
+
       if (!isLoggedIn) {
         followButton.style.display = "none";
       }
@@ -66,4 +75,13 @@ async function handleFollow(event) {
   await apiService.getWhoToFollow();
 }
 
-export {createProfile, handleFollow};
+async function handleUnfollow(event){
+  const button = event.target;
+  const username = button.getAttribute("data-username");
+  if(!username) return;
+
+  await apiService.unfollowUser(username);
+  await apiService.getWhoToFollow();
+}
+
+export { createProfile, handleFollow, handleUnfollow};

front-end/index.html

@@ -186,6 +186,7 @@ <h1 id="signup-heading" class="signup__title">Create your account</h1>
         </dl>
         <div class="profile__actions">
           <button type="button" data-action="follow">Follow</button>
+          <button type="button" data-action="unfollow">Unfollow</button>
         </div>
         <div class="profile__who-to-follow">
           <h4>Who to follow</h4>