diff --git a/aula/Group/routes.py b/aula/Group/routes.py
index 8914330..78acfad 100644
--- a/aula/Group/routes.py
+++ b/aula/Group/routes.py
@@ -5,8 +5,9 @@ import sys, datetime
 
 Group = Blueprint('Group', __name__)
 
-@Group.route("/groups/index", methods=['GET'])
+@Group.route("/groups", methods=['GET'])
 def index():
+    current_user.join_group(1000)
     groups = current_user.get_groups()
     return render_template('groups.html', groups=groups)
 
diff --git a/aula/models.py b/aula/models.py
index 1493ede..98ee88a 100644
--- a/aula/models.py
+++ b/aula/models.py
@@ -66,10 +66,10 @@ class User(tuple, UserMixin):
 
     def get_groups(self):
         cur = conn.cursor()
-        sql_call = f"""
-        SELECT groups.* FROM users_groups JOIN groups ON users_groups.group_id = groups.group_id WHERE users_groups.user_id = {self.user_id}
+        sql_call = """
+        SELECT groups.* FROM users_groups JOIN groups ON users_groups.group_id = groups.group_id WHERE users_groups.user_id = %s
         """
-        cur.execute(sql_call)
+        cur.execute(sql_call, (self.user_id,))
         groups = cur.fetchall()
         result = []
         for group_data in groups:
@@ -77,6 +77,25 @@ class User(tuple, UserMixin):
         cur.close()
         return result
 
+    def leave_group(self, group_id):
+        # TODO: Tjek om brugeren må forlade gruppen
+        cur = conn.cursor()
+        sql_call = """
+        DELETE FROM users_groups WHERE user_id = %s AND group_id = %s
+        """
+        cur.execute(sql_call, (self.user_id, group_id))
+        conn.commit()
+        cur.close()
+
+    def join_group(self, group_id):
+        cur = conn.cursor()
+        sql_call = """
+        INSERT INTO users_groups VALUES (%s, %s)
+        """
+        cur.execute(sql_call, (self.user_id, group_id))
+        conn.commit()
+        cur.close()
+
 
 def insert_users(user_id, first_name, last_name, password, email, adresse, role):
     cur = conn.cursor()