Docs: fix changelog link and sample examples. (#700)

* docs: update docs to show decimal field support and check constraints but no support for unsigned data type

* docs: linked changelog correctly

* docs: fix doc links for sample examples

* fix: skip test cursor_executemany_with_empty_params_list as spanner support is not there

Author: vi3k6i5

django_spanner/features.py

@@ -38,6 +38,8 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     skip_tests = (
         # No foreign key constraints in Spanner.
         "backends.tests.FkConstraintsTests.test_check_constraints",
+        # Spanner does not support empty list of DML statement.
+        "backends.tests.BackendTestCase.test_cursor_executemany_with_empty_params_list",
         "fixtures_regress.tests.TestFixtures.test_loaddata_raises_error_when_fixture_has_invalid_foreign_key",
         # No Django transaction management in Spanner.
         "basic.tests.SelectOnSaveTests.test_select_on_save_lying_update",

docs/changelog.md

@@ -0,0 +1 @@
+../CHANGELOG.md

docs/changelog.md

@@ -0,0 +1 @@
+../examples/from-scratch/README.md

docs/example_from_scratch.md

@@ -0,0 +1 @@
+../examples/healthchecks/README.md

docs/example_healthchecks.md

@@ -1,24 +1,12 @@
-Sample Code
-####################################
+Sample Examples
+###############
 
-Create and register your first model
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-To define your database layout create a models file in your app folder and add the relevant 
-classes to it. Spanner works exactly like any other database you may have used with Django. 
-Here is a simple example you can run with Spanner. In our poll application below we create 
-the following two models:
+django-spanner for Django tutorial
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-.. code:: python
+This `Example <example_from_scratch.html>`_ shows how to use django-spanner for Cloud Spanner as a backend database for `healthchecks.io <https://healthchecks.io>`_ 
 
-    from django.db import models
-    
-    class Question(models.Model):
-        question_text = models.CharField(max_length=200)
-        pub_date = models.DateTimeField('date published')
-        def __str__(self):
-            return str(self.rating)
-    
-    class Choice(models.Model):
-        question = models.ForeignKey(Question, on_delete=models.CASCADE)
-        choice_text = models.CharField(max_length=200)
-        votes = models.IntegerField(default=0)
+django-spanner on healthchecks.io
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This `Example <example_healthchecks.html>`_ shows how to use django-spanner for Cloud Spanner as a backend database for `Django's tutorials <https://docs.djangoproject.com/en/2.2/intro/tutorial01/>`_