From 73daf407150b4d0c456b529c4d9bba0e035fc370 Mon Sep 17 00:00:00 2001
From: Tom Christie
Date: Wed, 5 Nov 2014 15:51:45 +0000
Subject: ModelField should support max_length. Closes #2018.

---
 rest_framework/fields.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'rest_framework/fields.py')

diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index 363b684f..b554f238 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -1175,10 +1175,20 @@ class ModelField(Field):
     This is used by `ModelSerializer` when dealing with custom model fields,
     that do not have a serializer field to be mapped to.
     """
+    default_error_messages = {
+        'max_length': _('Ensure this field has no more than {max_length} characters.'),
+    }
+
     def __init__(self, model_field, **kwargs):
         self.model_field = model_field
         kwargs['source'] = '*'
+        # The `max_length` option is supported by Django's base `Field` class,
+        # so we'd better support it here.
+        max_length = kwargs.pop('max_length', None)
         super(ModelField, self).__init__(**kwargs)
+        if max_length is not None:
+            message = self.error_messages['max_length'].format(max_length=max_length)
+            self.validators.append(MaxLengthValidator(max_length, message=message))
 
     def to_internal_value(self, data):
         rel = getattr(self.model_field, 'rel', None)
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