Merged regressiontests and modeltests into the test root.

tests/field_subclassing/fields.py

@@ -0,0 +1,74 @@
+from __future__ import unicode_literals
+
+import json
+
+from django.db import models
+from django.utils.encoding import force_text
+from django.utils import six
+from django.utils.encoding import python_2_unicode_compatible
+
+
+@python_2_unicode_compatible
+class Small(object):
+    """
+    A simple class to show that non-trivial Python objects can be used as
+    attributes.
+    """
+    def __init__(self, first, second):
+        self.first, self.second = first, second
+
+    def __str__(self):
+        return '%s%s' % (force_text(self.first), force_text(self.second))
+
+class SmallField(six.with_metaclass(models.SubfieldBase, models.Field)):
+    """
+    Turns the "Small" class into a Django field. Because of the similarities
+    with normal character fields and the fact that Small.__unicode__ does
+    something sensible, we don't need to implement a lot here.
+    """
+
+    def __init__(self, *args, **kwargs):
+        kwargs['max_length'] = 2
+        super(SmallField, self).__init__(*args, **kwargs)
+
+    def get_internal_type(self):
+        return 'CharField'
+
+    def to_python(self, value):
+        if isinstance(value, Small):
+            return value
+        return Small(value[0], value[1])
+
+    def get_db_prep_save(self, value, connection):
+        return six.text_type(value)
+
+    def get_prep_lookup(self, lookup_type, value):
+        if lookup_type == 'exact':
+            return force_text(value)
+        if lookup_type == 'in':
+            return [force_text(v) for v in value]
+        if lookup_type == 'isnull':
+            return []
+        raise TypeError('Invalid lookup type: %r' % lookup_type)
+
+class SmallerField(SmallField):
+    pass
+
+
+class JSONField(six.with_metaclass(models.SubfieldBase, models.TextField)):
+
+    description = ("JSONField automatically serializes and desializes values to "
+        "and from JSON.")
+
+    def to_python(self, value):
+        if not value:
+            return None
+
+        if isinstance(value, six.string_types):
+            value = json.loads(value)
+        return value
+
+    def get_db_prep_save(self, value, connection):
+        if value is None:
+            return None
+        return json.dumps(value)