gavinwahl’s gists

gavinwahl / abcmodel.py

Created December 3, 2013 22:26

Abstract (PEP 3119) Django models.

	from abc import ABCMeta, abstractmethod


	class AbstractModelMeta(ABCMeta, type(models.Model)):
	pass

	class ABCModel(models.Model):
	__metaclass__ = AbstractModelMeta

	class Meta:

gavinwahl / group_reduce.js

Created October 23, 2013 19:34

	var group_reduce = function (dependentKey, key_func, reduce) {
	return Ember.reduceComputed.call(null, dependentKey, {
	initialValue: Ember.A,
	initialize: function(initialValue, changeMeta, instanceMeta) {
	instanceMeta.meta = new Ember.Map();
	},
	addedItem: function (accumulatedValue, obj, changeMeta, instanceMeta) {
	var key = key_func(obj), reduced_object;

	if (instanceMeta.meta.get(key) === undefined) {

gavinwahl / python_implementation

Last active June 16, 2024 07:42

Triggers to enforce referential integrity for foreign keys, if postgres didn't support them natively.

	CREATE OR REPLACE FUNCTION check_fk_child() RETURNS trigger AS $$
	DECLARE
	fk_local TEXT := TG_ARGV[0];
	parent_table TEXT := TG_ARGV[1];
	fk_val INT;
	is_valid BOOLEAN;
	query TEXT;
	BEGIN
	-- fk_val = getattr(NEW, fk_local)
	EXECUTE format('SELECT $1.%I', fk_local) USING NEW INTO fk_val;

gavinwahl / gist:5952850

Created July 8, 2013 21:59

consume_once

	from itertools import tee

	class consume_once(object):
	"""
	Takes an iterator and returns an iterable that can be consumed
	multiple times while only consuming the original a single time.

	>>> x = consume_once(i for i in range(3))
	>>> list(x)
	[0, 1, 2]

gavinwahl / split_up.py

Created June 3, 2013 20:36

Splits up a string into pages of a maximum length. Includes pages numbers. Tries not to split in the middle of a word. Good for SMS.

	from math import ceil

	def split_up(s, length=160):
	"""
	Splits the string s into pages of no longer than length. Includes
	pages numbers. Tries not to split in the middle of a word.

	>>> split_up("abc", 5)
	['abc']
	>>> split_up("abcdef", 5)

gavinwahl / mixins.py

Created June 2, 2013 18:18

DecoratorMixin is a mixin factory that converts any view decorator into a class-based view mixin.

	def DecoratorMixin(decorator):
	"""
	Converts a decorator written for a function view into a mixin for a
	class-based view.

	::

	LoginRequiredMixin = DecoratorMixin(login_required)

	class MyView(LoginRequiredMixin):

gavinwahl / tags.py

Created May 8, 2013 23:00

`map` template tag

	import uuid

	from django import template
	from django.template.base import Token, TOKEN_BLOCK

	register = template.Library()


	class MapNode(template.Node):
	def __init__(self, var_name, tag, list):

gavinwahl / base.py

Created April 10, 2013 20:22

`Resource` class to make django-rest-framework less tedious.

	class Resource(object):
	class Base(object):
	pass

	class List(generics.ListCreateAPIView):
	pass

	class Detail(generics.RetrieveUpdateDestroyAPIView):
	pass

gavinwahl / python.snippets

Created November 8, 2012 20:12

python super call snippet

	snippet sup
	super(`GetCurrentPythonClass()`, `GetFirstPythonArg()`).`GetCurrentPythonMethod()`(${1:`GetCurrentPythonArgs()`})${2}

gavinwahl / gist:3783150

Created September 25, 2012 17:00

	<html>
	<body>
	<div>
	<input type=file id="the_file">
	<button id="prev" onclick="goPrevious()">Previous</button>
	<button id="next" onclick="goNext()">Next</button>

	<span>Page: <span id="page_num"></span> / <span id="page_count"></span></span>
	</div>

Gavin Wahl gavinwahl