Use psycopg2-binary in order to remove Django warnings and fix a typo in docs

.travis.yml

@@ -12,6 +12,7 @@ env:
   matrix:
     - DJANGO='1.11'
     - DJANGO='2.0'
+    - DJANGO='2.1'
 
 matrix:
   include:

README.md

@@ -22,7 +22,7 @@ Define a type and add it to a model:
 
 ```python
 from django.db import models
-from postgres_composite_type import CompositeType
+from postgres_composite_types import CompositeType
 
 class Address(CompositeType):
     """An address."""
@@ -144,6 +144,17 @@ Lookups and indexes are not implemented yet
 ([bug #9](https://github.com/danni/django-postgres-composite-types/issues/9),
 [bug #10](https://github.com/danni/django-postgres-composite-types/issues/10)).
 
+Running Tests
+-------------------
+Clone the repository, go to it's base directory and run the following commands.
+
+    pip install tox
+    tox
+
+Or if you want a specific environment
+
+    tox -e py35-dj2.0
+
 Authors
 -------
 

postgres_composite_types/forms.py

@@ -36,14 +36,16 @@
 import logging
 from collections import OrderedDict
 
-from django import forms
+from django import VERSION, forms
 from django.contrib.postgres.utils import prefix_validation_error
 from django.utils.translation import ugettext as _
 
 from . import CompositeType
 
 LOGGER = logging.getLogger(__name__)
 
+DJANGO21 = VERSION >= (2, 1)
+
 
 class CompositeBoundField(forms.BoundField):
     """
@@ -144,9 +146,13 @@ def clean(self, value):
                 try:
                     cleaned_data[name] = field.clean(value.get(name))
                 except forms.ValidationError as error:
+                    if DJANGO21:
+                        prefix = '%(label)s:'
+                    else:
+                        prefix = '%(label)s: '
                     errors.append(prefix_validation_error(
                         error, code='field_invalid',
-                        prefix='%(label)s: ', params={'label': field.label}))
+                        prefix=prefix, params={'label': field.label}))
             if errors:
                 raise forms.ValidationError(errors)
             value = self.model(**cleaned_data)
@@ -218,6 +224,10 @@ def value_from_datadict(self, data, files, name):
             for subname, widget in self.widgets.items()
         }
 
+    def value_omitted_from_data(self, data, files, name):
+        prefix = '{}-'.format(name)
+        return not any(key.startswith(prefix) for key in data)
+
     def id_for_label(self, id_):
         """
         Wrapper around the field widget's `id_for_label` method.

requirements.in

@@ -1,2 +1,2 @@
 Django >= 1.11
-psycopg2
+psycopg2-binary

tests/test_forms.py

@@ -122,6 +122,21 @@ def test_null_initial_data(self):
             """,
             str(form['simple_field']))
 
+    def test_value_omission_check_inside_widget(self):
+        """
+        Assert that CompositeTypeWidget.value_omitted_from_data function
+        will return False when passing valid data.
+        """
+        form = self.SimpleForm()
+        widget = form.fields['simple_field'].widget
+        self.assertFalse(
+            widget.value_omitted_from_data(
+                data=self.simple_valid_data,
+                files=[],
+                name='simple_field',
+            )
+        )
+
     # pylint:disable=invalid-name
     def assertHTMLContains(self, text, content, count=None, msg=None):
         """

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 skipsdist = True
 envlist =
-  py{35,36}-dj{1.11,2.0}
+  py{35,36}-dj{1.11,2.0,2.1}
   pycodestyle,isort,pylint
 
 [testenv]
@@ -15,6 +15,7 @@ deps =
   -rtest_requirements.in
   dj1.11: Django~=1.11.0
   dj2.0: Django~=2.0.0
+  dj2.1: Django~=2.1.0
 
 [testenv:flake8]
 usedevelop = True