Introduce DRF and start replacing the views.

[wolnelektury.git] / src / api / fields.py

diff --git a/src/api/fields.py b/src/api/fields.py
new file mode 100644 (file)
index 0000000..4bb44dc
--- /dev/null
+++ b/src/api/fields.py
@@ -0,0 +1,34 @@
+from rest_framework import serializers
+from django.core.urlresolvers import reverse
+
+
+class AbsoluteURLField(serializers.ReadOnlyField):
+    def __init__(self, view_name=None, view_args=None, source='get_absolute_url', *args, **kwargs):
+        if view_name is not None:
+            source = '*'
+        super(AbsoluteURLField, self).__init__(*args, source=source, **kwargs)
+        self.view_name = view_name
+        self.view_args = {}
+        if view_args:
+            for v in view_args:
+                fields = v.split(':', 1)
+                self.view_args[fields[0]] = fields[1] if len(fields)>1 else fields[0]
+
+    def to_representation(self, value):
+        if self.view_name is not None:
+            kwargs = {
+                arg: getattr(value, field)
+                for (arg, field) in self.view_args.items()
+            }
+            value = reverse(self.view_name, kwargs=kwargs)
+        return self.context['request'].build_absolute_uri(value)
+
+
+class LegacyMixin(object):
+    def to_representation(self, value):
+        value = super(LegacyMixin, self).to_representation(value)
+        non_null_fields = getattr(getattr(self, 'Meta', None), 'legacy_non_null_fields', [])
+        for field in non_null_fields:
+            if field in value and value[field] is None:
+                value[field] = ''
+        return value