Merge pull request #422 from markotibold/max_length_for_modelserializers

Max length for modelserializers

docs/api-guide/fields.md

@@ -131,6 +131,18 @@ or `django.db.models.fields.TextField`.
 
 **Signature:** `CharField(max_length=None, min_length=None)`
 
+## URLField
+
+Corresponds to `django.db.models.fields.URLField`. Uses Django's `django.core.validators.URLValidator` for validation.
+
+**Signature:** `CharField(max_length=200, min_length=None)`
+
+## SlugField
+
+Corresponds to `django.db.models.fields.SlugField`.
+
+**Signature:** `CharField(max_length=50, min_length=None)`
+
 ## ChoiceField
 
 A field that can accept a value out of a limited set of choices.

rest_framework/fields.py

@@ -706,6 +706,23 @@ class CharField(WritableField):
         return smart_unicode(value)
 
 
+class URLField(CharField):
+    type_name = 'URLField'
+
+    def __init__(self, **kwargs):
+        kwargs['max_length'] = kwargs.get('max_length', 200)
+        kwargs['validators'] = [validators.URLValidator()]
+        super(URLField, self).__init__(**kwargs)
+
+
+class SlugField(CharField):
+    type_name = 'SlugField'
+
+    def __init__(self, *args, **kwargs):
+        kwargs['max_length'] = kwargs.get('max_length', 50)
+        super(SlugField, self).__init__(*args, **kwargs)
+
+
 class ChoiceField(WritableField):
     type_name = 'ChoiceField'
     widget = widgets.Select

rest_framework/serializers.py

@@ -429,6 +429,10 @@ class ModelSerializer(Serializer):
             kwargs['choices'] = model_field.flatchoices
             return ChoiceField(**kwargs)
 
+        max_length = getattr(model_field, 'max_length', None)
+        if max_length:
+            kwargs['max_length'] = max_length
+
         field_mapping = {
             models.FloatField: FloatField,
             models.IntegerField: IntegerField,
@@ -439,6 +443,8 @@ class ModelSerializer(Serializer):
             models.DateField: DateField,
             models.EmailField: EmailField,
             models.CharField: CharField,
+            models.URLField: URLField,
+            models.SlugField: SlugField,
             models.TextField: CharField,
             models.CommaSeparatedIntegerField: CharField,
             models.BooleanField: BooleanField,

rest_framework/tests/serializer.py

@@ -239,6 +239,14 @@ class ValidationTests(TestCase):
         self.assertEquals(serializer.is_valid(), True)
         self.assertEquals(serializer.errors, {})
 
+    def test_modelserializer_max_length_exceeded(self):
+        data = {
+            'title': 'x' * 201,
+        }
+        serializer = ActionItemSerializer(data=data)
+        self.assertEquals(serializer.is_valid(), False)
+        self.assertEquals(serializer.errors, {'title': [u'Ensure this value has at most 200 characters (it has 201).']})
+
 
 class MetadataTests(TestCase):
     def test_empty(self):