Add allow_blank for ChoiceField #2184

This makes a ChoiceField optional in HTML if
model field has `blank=True` set.

1 files changed, 5 insertions, 0 deletions

diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index 0c6c2d39..99498da7 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -958,9 +958,14 @@ class ChoiceField(Field):
             (six.text_type(key), key) for key in self.choices.keys()
         ])
 
+        self.allow_blank = kwargs.pop('allow_blank', False)
+
         super(ChoiceField, self).__init__(**kwargs)
 
     def to_internal_value(self, data):
+        if data == '' and self.allow_blank:
+            return ''
+
         try:
             return self.choice_strings_to_values[six.text_type(data)]
         except KeyError: