Add data structure for questions

doc/development/concepts.rst

@@ -67,6 +67,13 @@ and 'blue'.
 Any combination of those **values** is called a **variation**. Using the examples from 
 above, a possible **variation** would be 'T-Shirt, S, blue'.
 
+Questions
+^^^^^^^^^
+
+An item can be extended using **questions**. Questions enable items to be extended by
+additional information which can be entered by the user. Examples of possible questions
+include 'Name' or 'age'.
+
 Restrictions
 ^^^^^^^^^^^^
 

src/tixlbase/migrations/0014_auto_20141005_1037.py

@@ -0,0 +1,43 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('tixlbase', '0013_propertyvalue_position'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Question',
+            fields=[
+                ('id', models.AutoField(primary_key=True, auto_created=True, verbose_name='ID', serialize=False)),
+                ('question', models.TextField(verbose_name='Question')),
+                ('type', models.CharField(choices=[('N', 'Number'), ('S', 'Text (one line)'), ('T', 'Multiline text'), ('B', 'Yes/No')], max_length=5, verbose_name='Question type')),
+                ('required', models.BooleanField(default=False, verbose_name='Required question')),
+                ('event', models.ForeignKey(to='tixlbase.Event', related_name='events')),
+            ],
+            options={
+                'verbose_name': 'Question',
+                'verbose_name_plural': 'Questions',
+            },
+            bases=(models.Model,),
+        ),
+        migrations.AlterModelOptions(
+            name='itemvariation',
+            options={'verbose_name': 'Item variation', 'verbose_name_plural': 'Item variations'},
+        ),
+        migrations.AlterModelOptions(
+            name='propertyvalue',
+            options={'ordering': ('position',), 'verbose_name': 'Property value', 'verbose_name_plural': 'Property values'},
+        ),
+        migrations.AddField(
+            model_name='item',
+            name='questions',
+            field=models.ManyToManyField(to='tixlbase.Question', related_name='questions', blank=True, verbose_name='Questions', help_text='The user will be asked to fill in answers for the selected questions'),
+            preserve_default=True,
+        ),
+    ]

src/tixlbase/models.py

@@ -406,6 +406,47 @@ class PropertyValue(models.Model):
         return "%s: %s" % (self.prop.name, self.value)
 
 
+class Question(models.Model):
+    """
+    A question is an input field that can be used to extend a ticket
+    by custom information, e.g. "Attendee name" or "Attendee age".
+    """
+    TYPE_NUMBER = "N"
+    TYPE_STRING = "S"
+    TYPE_TEXT = "T"
+    TYPE_BOOLEAN = "B"
+    TYPE_CHOICES = (
+        (TYPE_NUMBER, _("Number")),
+        (TYPE_STRING, _("Text (one line)")),
+        (TYPE_TEXT, _("Multiline text")),
+        (TYPE_BOOLEAN, _("Yes/No")),
+    )
+
+    event = models.ForeignKey(
+        Event,
+        related_name="questions",
+    )
+    question = models.TextField(
+        verbose_name=_("Question"),
+    )
+    type = models.CharField(
+        max_length=5,
+        choices=TYPE_CHOICES,
+        verbose_name=_("Question type"),
+    )
+    required = models.BooleanField(
+        default=False,
+        verbose_name=_("Required question"),
+    )
+
+    class Meta:
+        verbose_name = _("Question")
+        verbose_name_plural = _("Questions")
+
+    def __str__(self):
+        return self.name
+
+
 class Item(models.Model):
     """
     An item is a thing which can be sold. It belongs to an
@@ -470,6 +511,16 @@ class Item(models.Model):
             + '\'Variations\' tab to configure the details.'
         )
     )
+    questions = models.ManyToManyField(
+        Question,
+        related_name='questions',
+        verbose_name=_("Questions"),
+        blank=True,
+        help_text=_(
+            'The user will be asked to fill in answers for the '
+            + 'selected questions'
+        )
+    )
 
     class Meta:
         verbose_name = _("Item")