User option to subscribe to emails and non-unique order IDs

src/problems/migrations/0007_nonunique-order-id.py

@@ -0,0 +1,19 @@
+# Generated by Django 2.1.5 on 2019-07-16 12:59
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('problems', '0006_reorder-problems'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='problem',
+            name='order_id',
+            field=models.IntegerField(null=True, validators=[django.core.validators.MinValueValidator(0)]),
+        ),
+    ]

src/problems/models.py

@@ -30,7 +30,7 @@ class Problem(models.Model):
     id = models.AutoField(primary_key=True)
 
     # The order of the problems in the problem list/table.
-    order_id = models.IntegerField(unique=True, validators=[MinValueValidator(0)], editable=True, null=True)
+    order_id = models.IntegerField(unique=False, validators=[MinValueValidator(0)], editable=True, null=True)
 
     # Unique name for database and urls, e.g. "earthquake-epicenters".
     name = models.CharField(unique=True, max_length=256, editable=True)

src/users/forms.py

@@ -8,7 +8,7 @@
 class EditUserProfileForm(forms.ModelForm):
     class Meta:
         model = UserProfile
-        fields = ['display_name', 'about', 'birthday', 'country', 'location']
+        fields = ['display_name', 'about', 'birthday', 'country', 'location', 'subscribe_to_emails']
         widgets = {
                 'country': CountrySelectWidget(
                     layout='{widget}<span class="icon"><img class="country-select-flag" id="{flag_id}" style="margin: 6px 4px 0" src="{country.flag}"></span>'

src/users/migrations/0015_subscribe_to_email_option.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.1.5 on 2019-07-16 13:18
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('users', '0014_fixed_default_avatar_filepath_v5'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='userprofile',
+            name='subscribe_to_emails',
+            field=models.BooleanField(default=True, help_text='Subscribe to emails.'),
+        ),
+    ]

src/users/models.py

@@ -9,10 +9,12 @@
 
 from django_countries.fields import CountryField
 
+
 def avatar_file_name(instance, filename):
     # We want a relative URL, not an absolute URL so I didn't use '/'.join(). Relative to MEDIA_ROOT.
     return "users/" + instance.user.username + "/" + filename
 
+
 class UserProfile(models.Model):
     id = models.AutoField(primary_key=True)
     user = models.OneToOneField(User, on_delete=models.CASCADE, unique=True)
@@ -34,8 +36,11 @@ class UserProfile(models.Model):
             validators=[MaxLengthValidator(50)],
             help_text="Maximum length of 50 characters.")
 
+    subscribe_to_emails = models.BooleanField(default=True, help_text="Subscribe to emails.")
+
     # The default avatar actually resides in media/static/img. I couldn't get it to link to the actual static/...
     avatar = models.ImageField(upload_to=avatar_file_name, max_length=100, default="static/img/default_avatar.png")
+
     problems_solved = models.IntegerField(default=0, validators=[MinValueValidator(0)])
     submissions_made = models.IntegerField(default=0, validators=[MinValueValidator(0)])
 

src/users/templates/users/editprofile.html

@@ -18,29 +18,36 @@ <h4 class="subtitle is-5 has-text-centered is-italic"><strong>{{ profile.problem
         {% for field in form.visible_fields %}
             <div class="field">
               <label class="label" for="{{ field.id_for_label }}">{{ field.label }}</label>
-              <div class="control has-icons-left">        
+              <div class="control has-icons-left">
                 {% if field.name == 'country' %}
                   <div class="select">{{ field }}</div>
+                {% elif field.name == 'subscribe_to_emails' %}
+                  {{ field }} Receive emails about new problems and features.
                 {% else %}
                   {{ field | add_class:'input' }}
                 {% endif %}
 
-                <span class="icon is-small is-left">
-                  {% if field.name == 'display_name' %}
-                    <i class="fas fa-user"></i>
-                  {% elif field.name == 'about' %}
-                    <i class="fas fa-pen"></i>
-                  {% elif field.name == 'birthday' %}
-                    <i class="fas fa-calendar"></i>
-                  {% elif field.name == 'location' %}
-                    <i class="fas fa-location-arrow"></i>
-                  {% endif %}
-                </span>
+                {% if field.name != 'subscribe_to_emails' %}
+                  <span class="icon is-small is-left">
+                    {% if field.name == 'display_name' %}
+                      <i class="fas fa-user"></i>
+                    {% elif field.name == 'about' %}
+                      <i class="fas fa-pen"></i>
+                    {% elif field.name == 'birthday' %}
+                      <i class="fas fa-calendar"></i>
+                    {% elif field.name == 'location' %}
+                      <i class="fas fa-location-arrow"></i>
+                    {% endif %}
+                  </span>
+                {% endif %}
               </div>
-              <p class="help">{{ field.help_text }}</p>
-              {% for error in field.errors %}
-                <p class="help is-danger">{{ error }}</p>
-              {% endfor %}
+
+              {% if field.name != 'subscribe_to_emails' %}
+                <p class="help">{{ field.help_text }}</p>
+                {% for error in field.errors %}
+                  <p class="help is-danger">{{ error }}</p>
+                {% endfor %}
+              {% endif %}
             </div>
         {% endfor %}
         <button class="button is-primary" type="submit">Save changes</button>