no duplicate entries and added flash messages

application/auth/views.py

@@ -1,4 +1,4 @@
-from flask import Blueprint, redirect, url_for, render_template
+from flask import Blueprint, redirect, url_for, render_template, flash
 from application.auth.forms import login_form
 from application.auth.models import User
 from flask_login import login_user, login_required, logout_user
@@ -20,6 +20,7 @@ def login():
 
         if user and user.check_password(password=password):
             login_user(user)
+            flash("Succesfully logged in")
             return redirect(url_for("dash.dashboard"))
     return render_template("login.html", form=loginForm)
 

application/dashboard/templates/base.html

@@ -97,6 +97,24 @@
                     </div>
                 </div>
             </div>
+            <svg xmlns="http://www.w3.org/2000/svg" class="d-none">
+                <symbol id="check-circle-fill" viewBox="0 0 16 16">
+                    <path
+                        d="M16 8A8 8 0 1 1 0 8a8 8 0 0 1 16 0zm-3.97-3.03a.75.75 0 0 0-1.08.022L7.477 9.417 5.384 7.323a.75.75 0 0 0-1.06 1.06L6.97 11.03a.75.75 0 0 0 1.079-.02l3.992-4.99a.75.75 0 0 0-.01-1.05z" />
+                </symbol>
+            </svg>
+
+            <div class="position-fixed w-25 bottom-0" style="z-index: 1050;">
+                {% for message in get_flashed_messages() %}
+                <div class="alert alert-success alert-dismissible fade show" role="alert">
+                    <svg class="bi flex-shrink-0 me-2" width="15" height="15" role="img" aria-label="Success:">
+                        <use xlink:href="#check-circle-fill" />
+                    </svg>
+                    {{message}}
+                    <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
+                </div>
+                {% endfor %}
+            </div>
 
             {%block content%}
 

application/dashboard/views.py

@@ -1,4 +1,4 @@
-from flask import Blueprint, render_template, request, jsonify
+from flask import Blueprint, render_template, request, jsonify, flash
 from application.dashboard.models import AllowedPlate, LoggedItem
 from application import db
 from application.dashboard.forms import npForm
@@ -24,21 +24,31 @@ def add():
     form = npForm()
 
     if form.validate_on_submit():
-        if form.numberplate.data:
-            ap = AllowedPlate(plate=form.numberplate.data)
-            db.session.add(ap)
-            db.session.commit()
+        plate = form.numberplate.data
+        print("test")
+        if AllowedPlate.query.filter_by(plate=plate).first():
+            print("test1")
+            flash("Numberplate is already registered")
+            return render_template(
+                "dashboard.html",
+                form=npForm(formdata=None), 
+                feedback="Numberplate is already registered",
+            )
+        ap = AllowedPlate(plate=plate)
+        db.session.add(ap)
+        db.session.commit()
+        print("test2")
+        flash("Numberplate succesfully added")
 
-            # Update the list on the page with JavaScript
-            if request.headers.get("X-Requested-With") == "XMLHttpRequest":
-                plates = AllowedPlate.query.order_by(AllowedPlate.id).all()
-                return jsonify(
-                    {
-                        "plates": [
-                            {"id": p.id, "plate": p.plate} for p in plates
-                        ]
-                    }
-                )
-
-    Plates = AllowedPlate.query.order_by(AllowedPlate.id).all()
-    return render_template("add.html", form=form, plates=Plates)
+        # Update the list on the page with JavaScript
+        if request.headers.get("X-Requested-With") == "XMLHttpRequest":
+            plates = AllowedPlate.query.order_by(AllowedPlate.id).all()
+            return jsonify(
+                {
+                    "plates": [
+                        {"id": p.id, "plate": p.plate} for p in plates
+                    ]
+                }
+            )
+        Plates = AllowedPlate.query.order_by(AllowedPlate.id).all()
+    return render_template("add.html", form=npForm(formdata=None), plates=Plates)