London | November 25 | Donara Blanc | Sprint 1 | Unfollow feature

backend/data/follows.py

@@ -19,7 +19,16 @@ def follow(follower: User, followee: User):
         except UniqueViolation:
             # 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,
@@ -148,7 +148,18 @@ def do_follow():
             "success": True,
         }
     )
+@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

@@ -29,6 +29,15 @@ function createProfile(template, {profileData, whoToFollow, isLoggedIn}) {
   followButtonEl.setAttribute("data-username", profileData.username || "");
   followButtonEl.hidden = profileData.is_self || profileData.is_following;
   followButtonEl.addEventListener("click", handleFollow);
+  const unfollowButtonEl = profileElement.querySelector("[data-action='unfollow']");
+  if (unfollowButtonEl) {
+  unfollowButtonEl.setAttribute("data-username", profileData.username || "");
+  unfollowButtonEl.hidden = profileData.is_self || !profileData.is_following;
+  unfollowButtonEl.addEventListener("click", handleUnfollow);
+  if (!isLoggedIn) {
+    unfollowButtonEl.style.display = "none";
+  }
+}
   if (!isLoggedIn) {
     followButtonEl.style.display = "none";
   }
@@ -65,5 +74,11 @@ async function handleFollow(event) {
   await apiService.followUser(username);
   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.getProfile(username);
+}
+export {createProfile, handleFollow, handleUnfollow};