PJ Farrell peterfarrell

Vue: Pass Slots through from Parent to Child Components

The Situation

We've got some components A, B and C which provide different slots.

const A = {
  template: `<div><slot name="a">Default A Content</slot></div>`
}

const B = {

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

Workflows (States) in Django

I'm going to cover a simple, but effective, utility for managing state and transitions (aka workflow). We often need to store the state (status) of a model and it should only be in one state at a time.

Common Software Uses

Publishing (Draft->Approved->Published->Expired->Deleted)

	from django.db.models import Q
	from django.db.models.constants import LOOKUP_SEP
	from django_filters import rest_framework as django_filters
	from django_filters.constants import EMPTY_VALUES


	class GroupFilterSet(django_filters.FilterSet):
	def filter_queryset(self, queryset):
	"""
	Group the fitlers by the first join table to

	# Add this code in any Django app's admin.py
	# Works for all Task Statuses; you can filter them in line 12.

	import ast
	import importlib
	import json

	from django.contrib import admin
	from django.contrib import messages
	from django.utils.safestring import mark_safe

	class GroupFilter:
	"""
	The work here is largely cherry-picked from this unmerged django-filters PR:
	https://github.com/carltongibson/django-filter/pull/1167/files
	"""

	def __init__(self, filter_names):
	self.filter_names = filter_names

	def set_parent(self, parent):

	# -- coding: utf-8; mode: django --
	import graphviz
	from optparse import make_option

	from django.core.management.base import BaseCommand
	from django.utils.encoding import force_text

	from django_fsm import FSMFieldMixin, GET_STATE, RETURN_VALUE

	try:

	class CustomTask(Task):
	def on_failure(self, exc, task_id, args, kwargs, einfo):
	info = '[{0}] failed: {1}'.format(task_id, exc)
	logger.exception(info, exc_info=exc)
	super(CustomTask, self).on_failure(exc, task_id, args, kwargs, einfo)

	def on_success(self, retval, task_id, args, kwargs):
	global app
	if app.is_warm_shutdown:
	app.consumer.connection._default_channel.do_restore = False

	# coding: utf-8
	from __future__ import unicode_literals
	import os
	from pdfminer.pdfdocument import PDFEncryptionError

	from pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreter
	from pdfminer.converter import TextConverter
	from pdfminer.layout import LAParams
	from pdfminer.pdfpage import PDFPage
	from cStringIO import StringIO

	// XPath CheatSheet
	// To test XPath in your Chrome Debugger: $x('/html/body')
	// http://www.jittuu.com/2012/2/14/Testing-XPath-In-Chrome/


	// 0. XPath Examples.
	// More: http://xpath.alephzarro.com/content/cheatsheet.html


	'//hr[@class="edge" and position()=1]' // every first hr of 'edge' class