London | 25-SDC-July | Fatma Arslantas | Sprint 1 | New Feature: Unfollow

backend/data/follows.py

@@ -20,6 +20,15 @@ def follow(follower: User, followee: User):
             # Already following - treat as idempotent request.
             pass
 
+def unfollow(follower: User, followee: User):
+    with db_cursor() as cur:
+        cur.execute(
+            "DELETE FROM follows WHERE follower = %(follower_id)s AND followee = %(followee_id)s",
+            dict(
+                follower_id=follower.id,
+                followee_id=followee.id,
+            ),
+        )
 
 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 +149,29 @@ def do_follow():
         }
     )
 
+@jwt_required()
+def do_unfollow():
+    type_check_error = verify_request_fields({"unfollow_username": str})
+    if type_check_error is not None:
+        return type_check_error
+
+    current_user = get_current_user()
+
+    unfollow_username = request.json["unfollow_username"]
+
+    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", 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 || "";
@@ -27,10 +28,25 @@ function createProfile(template, {profileData, whoToFollow, isLoggedIn}) {
   followerCountEl.textContent = profileData.followers?.length || 0;
   followingCountEl.textContent = profileData.follows?.length || 0;
   followButtonEl.setAttribute("data-username", profileData.username || "");
-  followButtonEl.hidden = profileData.is_self || profileData.is_following;
+  if (unfollowButtonEl) {
+    unfollowButtonEl.setAttribute("data-username", profileData.username || "");
+  }
+  if (profileData.is_self) {
+    followButtonEl.hidden = true;
+    if (unfollowButtonEl) unfollowButtonEl.hidden = true;
+  } else {
+    followButtonEl.hidden = profileData.is_following;
+    if (unfollowButtonEl) {
+      unfollowButtonEl.hidden = !profileData.is_following;
+    }
+  }
   followButtonEl.addEventListener("click", handleFollow);
+  if (unfollowButtonEl) {
+    unfollowButtonEl.addEventListener("click", handleUnfollow);
+  }
   if (!isLoggedIn) {
     followButtonEl.style.display = "none";
+    if (unfollowButtonEl) unfollowButtonEl.style.display = "none";
   }
 
   if (whoToFollow.length > 0) {
@@ -66,4 +82,12 @@ 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);
+}
+
+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" hidden>Unfollow</button>
         </div>
         <div class="profile__who-to-follow">
           <h4>Who to follow</h4>

front-end/lib/api.mjs

@@ -261,8 +261,9 @@ async function followUser(username) {
 
 async function unfollowUser(username) {
   try {
-    const data = await _apiRequest(`/unfollow/${username}`, {
+    const data = await _apiRequest("/unfollow", {
       method: "POST",
+      body: JSON.stringify({unfollow_username: username}),
     });
 
     if (data.success) {