Add snippets for ndb/properties

Author: Jerjou Cheng

appengine/ndb/properties/README.md

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+## App Engine Datastore NDB Properties Samples
+
+This contains snippets used in the NDB properties documentation, demonstrating
+various operation on ndb properties.
+
+<!-- auto-doc-link -->
+These samples are used on the following documentation page:
+
+> https://cloud.google.com/appengine/docs/python/ndb/properties
+
+<!-- end-auto-doc-link -->

appengine/ndb/properties/snippets.py

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+# Copyright 2016 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# [START notestore_imports]
+from google.appengine.ext import ndb
+from google.appengine.ext.ndb import msgprop
+# [END notestore_imports]
+from protorpc import messages
+
+
+class Account(ndb.Model):
+    username = ndb.StringProperty()
+    userid = ndb.IntegerProperty()
+    email = ndb.StringProperty()
+
+
+class Employee(ndb.Model):
+    full_name = ndb.StringProperty('n')
+    retirement_age = ndb.IntegerProperty('r')
+
+
+class Article(ndb.Model):
+    title = ndb.StringProperty()
+    stars = ndb.IntegerProperty()
+    tags = ndb.StringProperty(repeated=True)
+
+
+def create_article():
+    article = Article(
+        title='Python versus Ruby',
+        stars=3,
+        tags=['python', 'ruby'])
+    article.put()
+    return article
+
+
+class Address(ndb.Model):
+    type = ndb.StringProperty()  # E.g., 'home', 'work'
+    street = ndb.StringProperty()
+    city = ndb.StringProperty()
+
+
+class Contact(ndb.Model):
+    name = ndb.StringProperty()
+    addresses = ndb.StructuredProperty(Address, repeated=True)
+
+
+class ContactWithLocalStructuredProperty(ndb.Model):
+    name = ndb.StringProperty()
+    addresses = ndb.LocalStructuredProperty(Address, repeated=True)
+
+
+def create_contact():
+    guido = Contact(
+        name='Guido',
+        addresses=[
+            Address(
+                type='home',
+                city='Amsterdam'),
+            Address(
+                type='work',
+                street='Spear St',
+                city='SF')])
+
+    guido.put()
+    return guido
+
+
+def create_contact_with_local_structured_property():
+    guido = ContactWithLocalStructuredProperty(
+        name='Guido',
+        addresses=[
+            Address(
+                type='home',
+                city='Amsterdam'),
+            Address(
+                type='work',
+                street='Spear St',
+                city='SF')])
+
+    guido.put()
+    return guido
+
+
+class SomeEntity(ndb.Model):
+    name = ndb.StringProperty()
+    name_lower = ndb.ComputedProperty(lambda self: self.name.lower())
+
+
+def create_some_entity():
+    entity = SomeEntity(name='Nick')
+    entity.put()
+    return entity
+
+
+class Note(messages.Message):
+    text = messages.StringField(1, required=True)
+    when = messages.IntegerField(2)
+
+
+class NoteStore(ndb.Model):
+    note = msgprop.MessageProperty(Note, indexed_fields=['when'])
+    name = ndb.StringProperty()
+
+
+def create_note_store():
+    my_note = Note(text='Excellent note', when=50)
+
+    ns = NoteStore(note=my_note, name='excellent')
+    key = ns.put()
+
+    new_notes = NoteStore.query(NoteStore.note.when >= 10).fetch()
+    return new_notes, key
+
+
+class Notebook(messages.Message):
+    notes = messages.MessageField(Note, 1, repeated=True)
+
+
+class SignedStorableNotebook(ndb.Model):
+    author = ndb.StringProperty()
+    nb = msgprop.MessageProperty(
+        Notebook, indexed_fields=['notes.text', 'notes.when'])
+
+
+class Color(messages.Enum):
+    RED = 620
+    GREEN = 495
+    BLUE = 450
+
+
+class Part(ndb.Model):
+    name = ndb.StringProperty()
+    color = msgprop.EnumProperty(Color, required=True)
+
+
+def print_part():
+    p1 = Part(name='foo', color=Color.RED)
+    print p1.color  # prints "RED"

appengine/ndb/properties/snippets_test.py

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+# Copyright 2016 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import inspect
+
+from google.appengine.ext import ndb
+import pytest
+import snippets
+
+
+@pytest.yield_fixture
+def client(testbed):
+    yield testbed
+
+    for name, obj in inspect.getmembers(snippets):
+        if inspect.isclass(obj) and issubclass(obj, ndb.Model):
+            ndb.delete_multi(obj.query().iter(keys_only=True))
+
+
+def test_account(client):
+    account = snippets.Account(
+        username='flan',
+        userid=123,
+        email='[email protected]')
+    account.put()
+
+
+def test_employee(client):
+    employee = snippets.Employee(
+        full_name='Hob Gadling',
+        retirement_age=600)
+    employee.put()
+
+
+def test_article(client):
+    article = snippets.create_article()
+    assert article.title == 'Python versus Ruby'
+    assert article.stars == 3
+    assert sorted(article.tags) == sorted(['python', 'ruby'])
+
+
+def test_create_contact(client):
+    guido = snippets.create_contact()
+    assert guido.name == 'Guido'
+    addresses = guido.addresses
+    assert addresses[0].type == 'home'
+    assert addresses[1].type == 'work'
+    assert addresses[0].street is None
+    assert addresses[1].street == 'Spear St'
+    assert addresses[0].city == 'Amsterdam'
+    assert addresses[1].city == 'SF'
+
+
+def test_contact_with_local_structured_property(client):
+    guido = snippets.create_contact_with_local_structured_property()
+    assert guido.name == 'Guido'
+    addresses = guido.addresses
+    assert addresses[0].type == 'home'
+    assert addresses[1].type == 'work'
+
+
+def test_create_some_entity(client):
+    entity = snippets.create_some_entity()
+    assert entity.name == 'Nick'
+    assert entity.name_lower == 'nick'
+
+
+def test_computed_property(client):
+    entity = snippets.create_some_entity()
+    entity.name = 'Nick'
+    assert entity.name_lower == 'nick'
+    entity.name = 'Nickie'
+    assert entity.name_lower == 'nickie'
+
+
+def test_create_note_store(client):
+    note_stores, _ = snippets.create_note_store()
+    assert len(note_stores) == 1
+    assert note_stores[0].name == 'excellent'
+    assert note_stores[0].name == 'excellent'
+    assert note_stores[0].note.text == 'Excellent note'
+    assert note_stores[0].note.when == 50
+
+
+def test_notebook(client):
+    note1 = snippets.Note(
+        text='Refused to die.',
+        when=1389)
+    note2 = snippets.Note(
+        text='Printed some things',
+        when=1489)
+    note3 = snippets.Note(
+        text='Learned to use a sword',
+        when=1589)
+
+    notebook = snippets.Notebook(
+        notes=[note1, note2, note3])
+    stored_notebook = snippets.SignedStorableNotebook(
+        author='Hob Gadling',
+        nb=notebook)
+
+    stored_notebook.put()
+
+
+def test_part(client, capsys):
+    snippets.print_part()
+    stdout, _ = capsys.readouterr()
+    assert stdout.strip() == 'RED'