Merge pull request #1 from wesleykendall/develop

First version of django manager utils

.gitignore

@@ -0,0 +1,16 @@
+# Compiled python files
+*.pyc
+
+# Vim files
+*.swp
+*.swo
+
+# Coverage files
+.coverage
+
+# Setuptools distribution folder.
+/dist/
+
+# Python egg metadata, regenerated from source files by setuptools.
+/*.egg-info
+/*.egg

.travis.yml

@@ -0,0 +1,15 @@
+language: python
+python:
+  - '2.7'
+env:
+  - DJANGO=1.6.1 DB=postgres
+install:
+  - pip install -q Django==$DJANGO
+  - pip install -r requirements.txt
+before_script:
+  - find . | grep .py$ | grep -v /migrations | xargs pep8 --max-line-length=120
+  - find . | grep .py$ | grep -v /migrations | grep -v __init__.py | xargs pyflakes
+  - psql -c 'CREATE DATABASE manager_utils;' -U postgres
+script:
+  - coverage run --source='manager_utils' --branch manage.py test
+  - coverage report --fail-under=100

LICENSE

@@ -2,20 +2,19 @@ The MIT License (MIT)
 
 Copyright (c) 2014 Ambition
 
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
 
 The above copyright notice and this permission notice shall be included in all
 copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

MANIFEST.in

@@ -0,0 +1,3 @@
+include manager_utils/VERSION
+include README.md
+include LICENSE

README.md

@@ -1,4 +1,134 @@
+[![Build Status](https://travis-ci.org/ambitioninc/django-manager-utils.png)](https://travis-ci.org/ambitioninc/django-manager-utils)
 django-manager-utils
-====================
+=====================
 
-Model manager utils for Django
+Additional utilities for Django model managers.
+
+## A Brief Overview
+Django manager utils allows a user to perform various functions not natively supported by Django's model managers. To use the manager in your Django models, do:
+
+    from manager_utils import ManagerUtilsManager
+
+    class MyModel(Model):
+        objects = ManagerUtilsManager()
+
+If you want to extend an existing manager to use the manager utils, include mixin provided first (since it overrides the get_queryset function) as follows:
+
+    from manager_utils import ManagerUtilsMixin
+
+    class MyManager(ManagerUtilsMixin, Manager):
+        pass
+
+An overview of each util is below with links to more in-depth documentation and examples for each function.
+
+- [single](#single): Grabs a single element from table and verifies it is the only element.
+- [get_or_none](#get_or_none): Performs a get on a queryset and returns None if the object does not exist.
+- [upsert](#upsert): Performs an upsert (update or insert) to a model.
+- [bulk_update](#bulk_update): Bulk updates a list of models and the fields that have been updated.
+
+
+## single()<a name="single"></a>
+Assumes that the model only has one element in the table or queryset and returns that value. If the table has more than one or no value, an exception is raised.
+
+**Returns**: The only model object in the queryset.
+
+**Raises**: DoesNotExist error when the object does not exist or a MultipleObjectsReturned error when there is more than one object.
+
+**Examples**:
+
+    TestModel.objects.create(int_field=1)
+    model_obj = TestModel.objects.single()
+    print model_obj.int_field
+    1
+
+## get_or_none(\*\*query_params)<a name="get_or_none"></a>
+Get an object or return None if it doesn't exist.
+
+**Args**:
+- \*\*query_params: The query parameters used in the lookup.
+
+**Returns**: A model object if one exists with the query params, None otherwise.
+
+**Examples**:
+
+    model_obj = TestModel.objects.get_or_none(int_field=1)
+    print model_obj
+    None
+
+    TestModel.objects.create(int_field=1)
+    model_obj = TestModel.objects.get_or_none(int_field=1)
+    print model_obj.int_field
+    1
+
+## upsert(defaults=None, updates=None, \*\*kwargs)<a name="upsert"></a>
+Performs an update on an object or an insert if the object does not exist.
+
+**Args**:
+- defaults: These values are set when the object is inserted, but are irrelevant when the object already exists. This field should only be used when values only need to be set during creation.
+- updates: These values are updated when the object is updated. They also override any values provided in the defaults when inserting the object.
+- \*\*kwargs: These values provide the arguments used when checking for the existence of the object. They are used in a similar manner to Django's get_or_create function and are set in a created object.
+
+**Returns**: A tuple of the upserted object and a Boolean that is True if it was created (False otherwise)
+
+**Examples**:
+
+    # Upsert a test model with an int value of 1. Use default values that will be given to it when created
+    model_obj, created = TestModel.objects.upsert(int_field=1, defaults={'float_field': 2.0})
+    print created
+    True
+    print model_obj.int_field, model_obj.float_field
+    1, 2.0
+
+    # Do an upsert on that same model with different default fields. Since it already exists, the defaults
+    # are not used
+    model_obj, created = TestModel.objects.upsert(int_field=1, defaults={'float_field': 3.0})
+    print created
+    False
+    print model_obj.int_field, model_obj.float_field
+    1, 2.0
+
+    # In order to update the float field in an existing object, use the updates dictionary
+    model_obj, created = TestModel.objects.upsert(int_field=1, updates={'float_field': 3.0})
+    print created
+    False
+    print model_obj.int_field, model_obj.float_field
+    1, 3.0
+
+    # You can use updates on a newly created object that will also be used as initial values.
+    model_obj, created = TestModel.objects.upsert(int_field=2, updates={'float_field': 4.0})
+    print created
+    True
+    print model_obj.int_field, model_obj.float_field
+    2, 4.0
+
+## bulk_update(model_objs, fields_to_update)<a name="bulk_update"></a>
+Performs an bulk update on an list of objects. Any fields listed in the fields_to_update array will be updated in the database.
+
+**Args**:
+- model_objs: A list of model objects that are already stored in the database.
+- fields_to_update: A list of fields to update in the models. Only these fields will be updated in the database. The 'id' field is included by default.
+
+**Examples**:
+
+    # Create a couple test models
+    model_obj1 = TestModel.objects.create(int_field=1, float_field=2.0, char_field='Hi')
+    model_obj2 = TestModel.objects.create(int_field=3, float_field=4.0, char_field='Hello')
+
+    # Change their fields and do a bulk update
+    model_obj1.int_field = 10
+    model_obj1.float_field = 20.0
+    model_obj2.int_field = 30
+    model_obj2.float_field = 40.0
+    TestModel.objects.bulk_update([model_obj1, model_obj2], ['int_field', 'float_field'])
+
+    # Reload the models and view their changes
+    model_obj1 = TestModel.objects.get(id=model_obj1.id)
+    print model_obj1.int_field, model_obj1.float_field
+    10, 20.0
+
+    model_obj2 = TestModel.objects.get(id=model_obj2.id)
+    print model_obj2.int_field, model_obj2.float_field
+    10, 20.0
+
+## License
+MIT License (See the LICENSE file included in this repository)

manage.py

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+#!/usr/bin/env python
+import os
+import sys
+
+if __name__ == '__main__':
+    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'test_project.settings')
+
+    from django.core.management import execute_from_command_line
+
+    execute_from_command_line(sys.argv)

manager_utils/VERSION

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+0.1

manager_utils/__init__.py

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+from .manager_utils import ManagerUtilsMixin, ManagerUtilsManager