Correction du bug: follow un fils déjà follow ne fais plus cracher

WEB-INF/src/controleur/ThreadController.java

@@ -30,6 +30,10 @@ public class ThreadController extends HttpServlet {
 
         switch (action){
             case "follow":
+                if(daoFollower.checkFollowerExist(follow)){
+                    resp.sendRedirect("index.html");
+                    return ;
+                }
                 daoFollower.create(follow);
                 vue = "WEB-INF/vue/filsSuivis.jsp";
                 break;

WEB-INF/src/modele/dao/DaoFollower.java

@@ -53,7 +53,7 @@ public class DaoFollower {
         }
     }
 
-    public List<User> findByThreadID(int idThread){
+    public List<User> findUsersByThreadID(int idThread){
         DS bdd = DS.getInstance();
         List<User> res = new ArrayList<>();
         try(Connection con = bdd.getConnection()) {
@@ -69,7 +69,7 @@ public class DaoFollower {
         return res;
     }
 
-    public List<Thread> findByUsername(String username){
+    public List<Thread> findThreadsByUsername(String username){
         DS bdd = DS.getInstance();
         List<Thread> res = new ArrayList<>();
         try(Connection con = bdd.getConnection()) {
@@ -84,4 +84,19 @@ public class DaoFollower {
         }
         return res;
     }
+
+    public boolean checkFollowerExist(Follower follower){
+        DS bdd = DS.getInstance();
+        boolean res = false;
+        try(Connection con = bdd.getConnection()) {
+            PreparedStatement ps = con.prepareStatement("SELECT * FROM followers WHERE username = ? AND id_thread = ?");
+            ps.setString(1, follower.getUsername());
+            ps.setInt(2, follower.getId_thread());
+            ResultSet rs = ps.executeQuery();
+            res = rs.next();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return res;
+    }
 }