- Created the session continuation template and modified the...

- Created the session continuation template and modified the display_default_login_page() view to display the former when it is accessed by (logged-in) instances of the application user models (usermerge.{User/Admin})
- Modified the log_in() view to deny access to (logged-in) instances of the application user models (usermerge.{User/Admin})
- Modified the display_default_login_page(), log_in() and log_out() views to deny access to (logged-in) instances of Django's default user model (auth.User)
- Defined the has_empty_profile() method for the usermerge.User model and used it in templates and views to enhance functionality and readability
- Omitted the redundant user_id parameters/arguments from (i) the application site URLs defined in the URLconf and used in templates/views and (ii) the corresponding view declarations (the current/session user can be specified in any view via the user attribute of the associated request)
- Utilized the recov_user_id value of the session data in the _display_user_profile_recovery_success_message() and _display_user_profile_recovery_error_messages() helper functions as well as the search_for_recovery_user_profile() and recover_user_profile() views to enhance functionality and security
- Hooked the Django admin site into the /django-admin/ URL (instead of the default one, /admin/) to distinguish its pages from the ones that refer to the usermerge.Admin model and have an /admin/ URL prefix

myprj/myprj/urls.py

@@ -18,6 +18,6 @@ from django.contrib import admin
 from django.urls import include, path
 
 urlpatterns = [
-    path('admin/', admin.site.urls),
-    path('', include('usermerge.urls')),
+    path('django-admin/', admin.site.urls), # (Django) admin site URLs
+    path('', include('usermerge.urls')), # usermerge (application) site URLs
 ]

myprj/usermerge/auth.py

 """
-Modified version of django.contrib.auth module (https://docs.djangoproject.com/en/2.0/_modules/django/contrib/auth/).
+Modified version of django.contrib.auth module (https://docs.djangoproject.com/en/2.0/_modules/django/contrib/auth/)
+that refers to authentication against the application user models, i.e. usermerge.User and usermerge.Admin models.
 """
 
 from django.apps import apps as django_apps
@@ -63,8 +64,8 @@ def login(request, user, backend = None):
     # Calculate the session authentication hash for the authenticated user that attempts to log in based on the platform selected in the
     # login form. The selected platform is representative of the user model (if the selected platform was SLUB, the user model is Admin,
     # otherwise it is User) and the calculation of the hash differs between the user models (see the different get_session_auth_hash()
-    # methods in models.py). If the user logs in successfully, the hash is stored in the session data and can then be used to verify the
-    # user's authenticity during the session (see, for example, the get_user() function below).
+    # methods in models.py). If the user logs in successfully, the hash is stored in the session data as the HASH_SESSION_KEY value and
+    # can then be used to verify the user's authenticity during the session (see, for example, the get_user() function below).
     if platform_name == 'SLUB':
         # Admin hash calculation
         session_auth_hash = user.get_session_auth_hash()
@@ -93,7 +94,7 @@ def login(request, user, backend = None):
                              'provide the "backend" argument or set the "backend" attribute on the user.')
 
     request.session[SESSION_KEY] = user._meta.pk.value_to_string(user)
-    # The platform (name) selected in the login form is stored in the session data.
+    # The platform (name) selected in the login form is stored in the session data as the PLATFORM_SESSION_KEY value.
     request.session[PLATFORM_SESSION_KEY] = platform_name
     request.session[BACKEND_SESSION_KEY] = backend
     request.session[HASH_SESSION_KEY] = session_auth_hash

myprj/usermerge/decorators.py

@@ -17,7 +17,7 @@ def User_login_required(view):
     def User_model_required(func):
         @wraps(func)
         def wrapper(request, *args, **kwargs):
-            if str(request.user.__class__) == "<class 'usermerge.models.User'>":
+            if request.user._meta.label == 'usermerge.User':
                 return func(request, *args, **kwargs)
             else: # either auth.User or usermerge.Admin model
                 raise PermissionDenied
@@ -34,7 +34,7 @@ def Admin_login_required(view):
     def Admin_model_required(func):
         @wraps(func)
         def wrapper(request, *args, **kwargs):
-            if str(request.user.__class__) == "<class 'usermerge.models.Admin'>":
+            if request.user._meta.label == 'usermerge.Admin':
                 return func(request, *args, **kwargs)
             else: # either auth.User or usermerge.User model
                 raise PermissionDenied

myprj/usermerge/helper.py

@@ -85,12 +85,13 @@ def _display_user_profile_recovery_success_message(request, recov_user):
     """
     [Acts as inner function of the search_for_recovery_user_profile() view] Display the appropriate success message in the user profile
     recovery page by taking the recovery user profile (non-empty User instance that corresponds to both the validated - cleaned - and
-    adequate ece_id and email values of the corresponding form) into account. This message presents the (empty) session user with all the
-    field values of the aforementioned profile and informs him/her that if he/she proceeds with the profile recovery, he/she will get
-    logged out after his/her credentials for the login platform have first been associated with this profile (they will replace any
-    previously associated ones). Finally, include the recovery profile in the page context to assist the recovery procedure - see the
-    recover_user_profile() view.
+    adequate ece_id and email values of the corresponding form) into account. This message presents the (empty) session user with all
+    the field values of the aforementioned profile and informs him/her that if he/she proceeds with the profile recovery, he/she will
+    get logged out after his/her credentials for the login platform have first been associated with this profile (they will replace any
+    previously associated ones). Finally, enable the recovery procedure - see the recover_user_profile() view - by storing the id of
+    the recovery user profile in the session data as the recov_user_id value (it replaces any previously stored one).
     """
+    request.session['recov_user_id'] = recov_user.id
     success_message = ('Τα δηλωθέντα στοιχεία εντοπίστηκαν επιτυχώς στη βάση και παραπέμπουν στο εξής καταχωρημένο προφίλ:\n\n'
                        'Όνομα: %s\n'
 		       'Επώνυμο: %s\n'
@@ -102,14 +103,19 @@ def _display_user_profile_recovery_success_message(request, recov_user):
                       ) % (recov_user.first_name, recov_user.last_name,
                            '[Δεν έχει καταχωρηθεί]' if recov_user.ece_id is None else recov_user.ece_id,
                            recov_user.email, request.session[PLATFORM_SESSION_KEY])
-    return TemplateResponse(request, 'user_profile_recovery.html', {'success_message': success_message, 'recov_user': recov_user})
+    return TemplateResponse(request, 'user_profile_recovery.html', {'success_message': success_message})
 
 def _display_user_profile_recovery_error_messages(request, error_data):
     """
     [Acts as inner function of the search_for_recovery_user_profile() view] Create the appropriate post-validation error messages
     by using the validated (cleaned), yet inadequate, ece_id or/and email values of the user profile recovery form along with the
-    corresponding error codes, display them in the user profile recovery page and include the error codes in the page context.
+    corresponding error codes, display them in the user profile recovery page and include the error codes in the page context. Since
+    no recovery user profile (non-empty User instance that corresponds to both of the aforementioned form values) has been specified
+    in usermergeDB, disable the recovery procedure - see the recover_user_profile() view - by ensuring that the recov_user_id value
+    does not exist in the session data (if it exists, delete it).
     """
+    if 'recov_user_id' in request.session:
+        del request.session['recov_user_id']
     error_messages = []
     error_codes = []
     # The ece_id_and_email_exist_in_different_profiles error can only occur by itself. This means that if it occurs,

myprj/usermerge/middleware.py

@@ -9,7 +9,7 @@ from . import auth as usermerge_auth
 
 # AuthenticationMiddleware is a middleware component that associates the current user with every incoming web request. Original source code for the get_user() function and the aforementioned component can be found in https://github.com/django/django/blob/master/django/contrib/auth/middleware.py (for more information, see https://docs.djangoproject.com/en/2.0/ref/middleware/#django.contrib.auth.middleware.AuthenticationMiddleware).
 # For more information on default/customizing user authentication and password management, see https://docs.djangoproject.com/en/2.0/topics/auth/, auth.py and backends.py .
-# The login() function of the application's authentication module (usermerge.auth) is used to log a user (usermerge.{User/Admin} instance) in via the login page of the application - see the log_in() view - and inserts the PLATFORM_SESSION_KEY value into the (dictionary-like) session data based on the platform selected in the corresponding form. On the other hand, the login() function of the default authentication module (django.contrib.auth) is used to log a user (auth.User instance) in via the login page of the admin site (see https://docs.djangoproject.com/en/2.0/ref/contrib/admin/) and does not insert any PLATFORM_SESSION_KEY value into the session data as the corresponding form does not include any platform field.
+# The login() function of the application's authentication module (usermerge.auth) is used to log a user (usermerge.{User/Admin} instance) in via the login page of the application - see the log_in() view - and stores the PLATFORM_SESSION_KEY value in the session data based on the platform (name) selected in the corresponding form. On the other hand, the login() function of the default authentication module (django.contrib.auth) is used to log a user (auth.User instance) in via the login page of the admin site (see https://docs.djangoproject.com/en/2.0/ref/contrib/admin/) and does not store any PLATFORM_SESSION_KEY value in the session data as the corresponding form does not include any platform field.
 
 def get_user(request):
     if not hasattr(request, '_cached_user'):

myprj/usermerge/models.py

@@ -34,11 +34,20 @@ class User(models.Model):
     @property
     def is_authenticated(self):
         """
-        Always return True. This is a way to tell if the user has been
-        authenticated in templates, views, etc.
+        Always return True. This is a way to tell if the user has been authenticated in templates, views, etc.
         """
         return True
 
+    def has_empty_profile(self):
+        """
+        Return the opposite boolean value of the email field, i.e. True if the email is None and False otherwise. This is a way to tell
+        whether the user has an empty profile in templates, views, etc. as the user profile is empty if the email is None and vice versa.
+        """
+        # The email value can be used to determine whether the user profile (User instance) is empty or not due to the latter's
+        # possible/valid (field) states in usermergeDB and the allowed/consistent transitions between them (see the relative
+        # comment at the top).
+        return not bool(self.email)
+
 class Platform(models.Model):
     name = models.CharField(max_length = 50, unique = True)
 
@@ -84,8 +93,7 @@ class Admin(models.Model):
     @property
     def is_authenticated(self):
         """
-        Always return True. This is a way to tell if the user has been
-        authenticated in templates, views, etc.
+        Always return True. This is a way to tell whether the user has been authenticated in templates, views, etc.
         """
         return True
 

myprj/usermerge/templates/admin_home.html

@@ -7,7 +7,7 @@
 {% block content %}
     <nav id="session_nav">
         Έχετε εισέλθει ως <strong>{{ user.first_name }} {{ user.last_name }}</strong>!
-        | <a href="{% url 'admin_home' user.id %}">Αρχική Σελίδα</a>
+        | <a href="{% url 'admin_home' %}">Αρχική Σελίδα</a>
         | <a href="{% url 'logout' %}">Έξοδος</a>
     </nav>
 

myprj/usermerge/templates/session_continuation.html

+{# This page/template is utilized in the display_default_login_page() view. #}
+
+{% extends 'base.html' %}
+
+{% block title %}
+    SLUB - Συνέχιση Συνεδρίας ή Έξοδος
+{% endblock %}
+
+{% block content %}
+    <nav id="session_nav">
+        {% if user.first_name and user.last_name %}
+            Έχετε εισέλθει ως <strong>{{ user.first_name }} {{ user.last_name }}</strong>!
+        {% else %}
+            Έχετε εισέλθει επιτυχώς!
+        {% endif %}
+        | <a href="{% url home_page_url %}">Αρχική Σελίδα</a>
+        | <a href="{% url 'logout' %}">Έξοδος</a>
+    </nav>
+
+    <h4>Συνέχιση Συνεδρίας ή Έξοδος</h4>
+
+    <p>
+        <strong>
+            Υπάρχει ήδη μία συνεδρία σε ισχύ! Θα θέλατε να <a href="{% url home_page_url %}">συνεχίσετε</a> την πλοήγηση σε αυτήν <br />
+            ή να <a href="{% url 'logout' %}">εξέλθετε</a> για να ξεκινήσετε μία νέα συνεδρία ως διαφορετικός χρήστης;
+        </strong>
+    </p>
+{% endblock %}

myprj/usermerge/templates/user_home.html

@@ -5,44 +5,46 @@
 {% endblock %}
 
 {% block content %}
-    <nav id="session_nav">
-        {% if user.first_name and user.last_name %}
-            Έχετε εισέλθει ως <strong>{{ user.first_name }} {{ user.last_name }}</strong>!
-        {% else %}
-            Έχετε εισέλθει επιτυχώς!
-        {% endif %}
-        | <a href="{% url 'user_home' user.id %}">Αρχική Σελίδα</a>
-        | <a href="{% url 'logout' %}">Έξοδος</a>
-    </nav>
-
-    <h4>Αρχική Σελίδα Χρήστη</h4>
+    {% with empty_user_profile=user.has_empty_profile %}
+        <nav id="session_nav">
+            {% if not empty_user_profile %}
+                Έχετε εισέλθει ως <strong>{{ user.first_name }} {{ user.last_name }}</strong>!
+            {% else %}
+                Έχετε εισέλθει επιτυχώς!
+            {% endif %}
+            | <a href="{% url 'user_home' %}">Αρχική Σελίδα</a>
+            | <a href="{% url 'logout' %}">Έξοδος</a>
+        </nav>
 
-    {% if user.ece_id is None %}
-        <p>
-            <strong>
-                {% if user.first_name == '' and user.last_name == '' and user.email is None %}
-                    &#x272A; Παρακαλούμε συμπληρώστε άμεσα τα στοιχεία του προφίλ σας επιλέγοντας "Επεξεργασία Προφίλ"!
-                {% else %}
-                    &#x272A; Αν διαθέτετε αριθμό μητρώου, παρακαλούμε συμπληρώστε άμεσα το <br />
-                             αντίστοιχο πεδίο του προφίλ επιλέγοντας "Επεξεργασία Προφίλ"!
-                {% endif %}
-            </strong>
-        </p>
-    {% endif %}
+        <h4>Αρχική Σελίδα Χρήστη</h4>
 
-    <nav id="home_nav">
-        {% comment %}
-            The "Edit Profile" and "Log out" options are ALWAYS available to the user. ALL the OTHER
-            navigation options are available to him/her ONLY if his/her profile is NON-empty.
-        {% endcomment %}
-        <p><a href="{% url 'default_user_profile_edit' user.id %}">Επεξεργασία Προφίλ</a></p>
-        {% if user.first_name != '' and user.last_name != '' and user.email is not None %}
-            {# Insert ALL the OTHER navigation options HERE! #}
-            {# ... #}
-            {# ... #}
-            {# ... #}
+        {% if user.ece_id is None %}
+            <p>
+                <strong>
+                    {% if empty_user_profile %}
+                        &#x272A; Παρακαλούμε συμπληρώστε άμεσα τα στοιχεία του προφίλ σας επιλέγοντας "Επεξεργασία Προφίλ"!
+                    {% else %}
+                        &#x272A; Αν διαθέτετε αριθμό μητρώου, παρακαλούμε συμπληρώστε άμεσα το <br />
+                                 αντίστοιχο πεδίο του προφίλ επιλέγοντας "Επεξεργασία Προφίλ"!
+                    {% endif %}
+                </strong>
+            </p>
         {% endif %}
-        <p><a href="{% url 'logout' %}">Έξοδος</a></p>
-    </nav>
+
+        <nav id="home_nav">
+            {% comment %}
+                The "Edit Profile" and "Log out" options are ALWAYS available to the user. ALL the OTHER
+                navigation options are available to him/her ONLY if his/her profile is NON-empty.
+            {% endcomment %}
+            <p><a href="{% url 'default_user_profile_edit' %}">Επεξεργασία Προφίλ</a></p>
+            {% if not empty_user_profile %}
+                {# Insert ALL the OTHER navigation options HERE! #}
+                {# ... #}
+                {# ... #}
+                {# ... #}
+            {% endif %}
+            <p><a href="{% url 'logout' %}">Έξοδος</a></p>
+        </nav>
+    {% endwith %}
 {% endblock %}
 

myprj/usermerge/templates/user_profile_edit.html

@@ -5,91 +5,95 @@
 {% endblock %}
 
 {% block content %}
-    <nav id="session_nav">
-        {% if user.first_name and user.last_name %}
-            Έχετε εισέλθει ως <strong>{{ user.first_name }} {{ user.last_name }}</strong>!
-        {% else %}
-            Έχετε εισέλθει επιτυχώς!
-        {% endif %}
-        | <a href="{% url 'user_home' user.id %}">Αρχική Σελίδα</a>
-        | <a href="{% url 'logout' %}">Έξοδος</a>
-    </nav>
+    {% with empty_user_profile=user.has_empty_profile %}
+        <nav id="session_nav">
+            {% if not empty_user_profile %}
+                Έχετε εισέλθει ως <strong>{{ user.first_name }} {{ user.last_name }}</strong>!
+            {% else %}
+                Έχετε εισέλθει επιτυχώς!
+            {% endif %}
+            | <a href="{% url 'user_home' %}">Αρχική Σελίδα</a>
+            | <a href="{% url 'logout' %}">Έξοδος</a>
+        </nav>
 
-    <h4>Επεξεργασία Προφίλ Χρήστη</h4>
+        <h4>Επεξεργασία Προφίλ Χρήστη</h4>
 
-    {% if user.first_name == '' and user.last_name == '' and user.email is None %}
-        <p>
-            <strong>
-                &#x272A; Αν καταχωρήσατε τα στοιχεία του προφίλ σας κατά τη διάρκεια παλιότερης εισόδου σας στο σύστημα και <br />
-                         αυτά δεν εμφανίζονται τώρα στην παρακάτω φόρμα (είτε γιατί έχετε αλλάξει τα διαπιστευτήρια της <br />
-                         πλατφόρμας εισόδου είτε γιατί έχετε εισέλθει για πρώτη φορά με διαπιστευτήρια αυτής της πλατφόρμας), <br />
-                         παρακαλούμε ανακτήστε τα από τη βάση χωρίς να συμπληρώσετε τα πεδία της παρακάτω φόρμας! <br />
-                         <a href="{% url 'default_user_profile_recovery' user.id %}">&#x2192; Ανάκτηση χωρίς Συμπλήρωση</a>
-            </strong>
-        </p>
-        <br />
-    {% endif %}
+        {% if empty_user_profile %}
+            <p>
+                <strong>
+                    &#x272A; Αν καταχωρήσατε τα στοιχεία του προφίλ σας κατά τη διάρκεια παλιότερης εισόδου σας στο σύστημα και <br />
+                             αυτά δεν εμφανίζονται τώρα στην παρακάτω φόρμα (είτε γιατί έχετε αλλάξει τα διαπιστευτήρια της <br />
+                             πλατφόρμας εισόδου είτε γιατί έχετε εισέλθει για πρώτη φορά με διαπιστευτήρια αυτής της πλατφόρμας), <br />
+                             παρακαλούμε ανακτήστε τα από τη βάση χωρίς να συμπληρώσετε τα πεδία της παρακάτω φόρμας! <br />
+                             <a href="{% url 'default_user_profile_recovery' %}">&#x2192; Ανάκτηση χωρίς Συμπλήρωση</a>
+                </strong>
+            </p>
+            <br />
+        {% endif %}
 
-    <form id="user_profile_edit_form" accept-charset="utf-8" action="{% url 'edit_user_profile' user.id %}" method="post">
-        {% csrf_token %}
+        <form id="user_profile_edit_form" accept-charset="utf-8" action="{% url 'edit_user_profile' %}" method="post">
+            {% csrf_token %}
 
-        <table>
-            <tbody>
-                <tr>
-                    <td style="text-align:right;"><label for="first_name">Όνομα:</label></td>
-                    <td style="text-align:left;">
-                        <input type="text" name="first_name" id="first_name" maxlength="50"
-                               value="{{ user.first_name }}" required="required" />
-                    </td>
-                </tr>
-                <tr>
-                    <td style="text-align:right;"><label for="last_name">Επώνυμο:</label></td>
-                    <td style="text-align:left;">
-                        <input type="text" name="last_name" id="last_name" maxlength="50"
-                               value="{{ user.last_name }}" required="required" />
-                    </td>
-                </tr>
-                <tr>
-                    <td style="text-align:right;"><label for="ece_id">Αριθμός μητρώου<span style="color:darkorange;">*</span>:</label></td>
-                    <td style="text-align:left;">
-                        <input type="text" name="ece_id" id="ece_id" maxlength="8" pattern="031[0-9]{5}"
-                               {% if user.ece_id is not None %}value="{{ user.ece_id }}"{% endif %} />
-                    </td>
-                </tr>
-                <tr>
-                    <td style="text-align:right;"><label for="email">Ηλεκτρονικό ταχυδρομείο:</label></td>
-                    <td style="text-align:left;">
-                        <input type="email" name="email" id="email" maxlength="100"
-                               {% if user.email is not None %}value="{{ user.email }}"{% endif %} required="required" />
-                    </td>
-                </tr>
-            </tbody>
-        </table>
+            <table>
+                <tbody>
+                    <tr>
+                        <td style="text-align:right;"><label for="first_name">Όνομα:</label></td>
+                        <td style="text-align:left;">
+                            <input type="text" name="first_name" id="first_name" maxlength="50"
+                                   value="{{ user.first_name }}" required="required" />
+                        </td>
+                    </tr>
+                    <tr>
+                        <td style="text-align:right;"><label for="last_name">Επώνυμο:</label></td>
+                        <td style="text-align:left;">
+                            <input type="text" name="last_name" id="last_name" maxlength="50"
+                                   value="{{ user.last_name }}" required="required" />
+                        </td>
+                    </tr>
+                    <tr>
+                        <td style="text-align:right;">
+                            <label for="ece_id">Αριθμός μητρώου<span style="color:darkorange;">*</span>:</label>
+                        </td>
+                        <td style="text-align:left;">
+                            <input type="text" name="ece_id" id="ece_id" maxlength="8" pattern="031[0-9]{5}"
+                                   {% if user.ece_id is not None %}value="{{ user.ece_id }}"{% endif %} />
+                        </td>
+                    </tr>
+                    <tr>
+                        <td style="text-align:right;"><label for="email">Ηλεκτρονικό ταχυδρομείο:</label></td>
+                        <td style="text-align:left;">
+                            <input type="email" name="email" id="email" maxlength="100"
+                                   {% if user.email is not None %}value="{{ user.email }}"{% endif %} required="required" />
+                        </td>
+                    </tr>
+                </tbody>
+            </table>
 
-        <p style="color:darkorange;">
-            <strong>
-                * Αν δεν διαθέτετε αριθμό μητρώου ακόμα, μπορείτε προσωρινά να παραλείψετε το αντίστοιχο πεδίο! <br />
-                  Σε αντίθετη περίπτωση, παρακαλούμε συμπληρώστε το άμεσα!
-            </strong>
-        </p>
+            <p style="color:darkorange;">
+                <strong>
+                    * Αν δεν διαθέτετε αριθμό μητρώου ακόμα, μπορείτε προσωρινά να παραλείψετε το αντίστοιχο πεδίο! <br />
+                      Σε αντίθετη περίπτωση, παρακαλούμε συμπληρώστε το άμεσα!
+                </strong>
+            </p>
 
-        <input type="submit" value="Αποθήκευση" />
-    </form>
+            <input type="submit" value="Αποθήκευση" />
+        </form>
 
-    {% if success_message %}
-        <p style="color:green;">
-            <img src="images/tick.png" alt="Επιβεβαίωση:" />
-            <strong>{{ success_message | linebreaksbr }}</strong>
-        </p>
-    {% elif error_messages %}
-        {% for message in error_messages %}
-            <p style="color:red;">
-                <img src="images/warning.svg" alt="Σφάλμα:" />
-                <strong>{{ message | linebreaksbr }}</strong>
+        {% if success_message %}
+            <p style="color:green;">
+                <img src="images/tick.png" alt="Επιβεβαίωση:" />
+                <strong>{{ success_message | linebreaksbr }}</strong>
             </p>
-        {% endfor %}
-    {% endif %}
+        {% elif error_messages %}
+            {% for message in error_messages %}
+                <p style="color:red;">
+                    <img src="images/warning.svg" alt="Σφάλμα:" />
+                    <strong>{{ message | linebreaksbr }}</strong>
+                </p>
+            {% endfor %}
+        {% endif %}
 
-    <p><a href="{% url 'user_home' user.id %}">&#x21B5; Επιστροφή στην Αρχική Σελίδα</a></p>
+        <p><a href="{% url 'user_home' %}">&#x21B5; Επιστροφή στην Αρχική Σελίδα</a></p>
+    {% endwith %}
 {% endblock %}
 

myprj/usermerge/templates/user_profile_recovery.html

@@ -7,7 +7,7 @@
 {% block content %}
     <nav id="session_nav">
         Έχετε εισέλθει επιτυχώς!
-        | <a href="{% url 'user_home' user.id %}">Αρχική Σελίδα</a>
+        | <a href="{% url 'user_home' %}">Αρχική Σελίδα</a>
         | <a href="{% url 'logout' %}">Έξοδος</a>
     </nav>
 
@@ -21,7 +21,7 @@
         </strong>
     </p>
 
-    <form id="user_profile_recovery_form" accept-charset="utf-8" action="{% url 'search_for_recovery_user_profile' user.id %}" method="post">
+    <form id="user_profile_recovery_form" accept-charset="utf-8" action="{% url 'search_for_recovery_user_profile' %}" method="post">
         {% csrf_token %}
 
         <table>
@@ -51,7 +51,7 @@
             <strong>
                 {{ success_message | linebreaksbr }}
                 <br />
-                <a href="{% url 'recover_user_profile' user.id recov_user.id %}">&#x2192; Ανάκτηση και Έξοδος</a>
+                <a href="{% url 'recover_user_profile' %}">&#x2192; Ανάκτηση και Έξοδος</a>
             </strong>
         </p>
     {% elif error_messages %}
@@ -63,6 +63,6 @@
         {% endfor %}
     {% endif %}
 
-    <p><a href="{% url 'default_user_profile_edit' user.id %}">&#x21B5; Επιστροφή στην Επεξεργασία Προφίλ</a></p>
+    <p><a href="{% url 'default_user_profile_edit' %}">&#x21B5; Επιστροφή στην Επεξεργασία Προφίλ</a></p>
 {% endblock %}
 

myprj/usermerge/urls.py

-"""usermerge URL Configuration
+"""usermerge (application) URL Configuration
 
 The `urlpatterns` list routes URLs to views. For more information please see:
     https://docs.djangoproject.com/en/2.0/topics/http/urls/
@@ -21,16 +21,13 @@ urlpatterns = [
     # The default login page serves as index page. Therefore, its regular route becomes r'^$' instead of r'^login/default$'.
     re_path(r'^$', views.display_default_login_page, name = 'default_login'),
     re_path(r'^login/submit$', views.log_in, name = 'submit_login'),
-    re_path(r'^user/home/id=(\d{1,10})$', views.display_user_home_page, name = 'user_home'),
-    re_path(r'^user/profile/edit/default/id=(\d{1,10})$', views.display_default_user_profile_edit_page, name = 'default_user_profile_edit'),
-    re_path(r'^user/profile/edit/submit/id=(\d{1,10})$', views.edit_user_profile, name = 'edit_user_profile'),
-    re_path(r'^user/profile/recovery/default/id=(\d{1,10})$', views.display_default_user_profile_recovery_page,
-                                                              name = 'default_user_profile_recovery'),
-    re_path(r'^user/profile/recovery/search/id=(\d{1,10})$', views.search_for_recovery_user_profile,
-                                                             name = 'search_for_recovery_user_profile'),
-    re_path(r'^user/profile/recovery/submit/id=(\d{1,10})/recover/id=(\d{1,10})$', views.recover_user_profile,
-                                                                                   name = 'recover_user_profile'),
-    re_path(r'^admin/home/id=(\d{1,10})$', views.display_admin_home_page, name = 'admin_home'),
+    re_path(r'^user/home$', views.display_user_home_page, name = 'user_home'),
+    re_path(r'^user/profile/edit/default$', views.display_default_user_profile_edit_page, name = 'default_user_profile_edit'),
+    re_path(r'^user/profile/edit/submit$', views.edit_user_profile, name = 'edit_user_profile'),
+    re_path(r'^user/profile/recovery/default$', views.display_default_user_profile_recovery_page, name = 'default_user_profile_recovery'),
+    re_path(r'^user/profile/recovery/search$', views.search_for_recovery_user_profile, name = 'search_for_recovery_user_profile'),
+    re_path(r'^user/profile/recovery/submit$', views.recover_user_profile, name = 'recover_user_profile'),
+    re_path(r'^admin/home$', views.display_admin_home_page, name = 'admin_home'),
     re_path(r'^logout$', views.log_out, name = 'logout'),
 ]