NigelEarle

Knex Setup Guide

Create your project directory

Create and initialize your a directory for your Express application.

$ mkdir node-knex-demo
$ cd node-knex-demo
$ npm init

joelbowen

Change your app.json to base-app.json and untrack the original file in your .gitignore

Then add something like "generateConfig": "rimraf app.json && node generateConfig" to your package.json scripts, and yarn generateConfig && react-native-scripts start to scripts like "start" or any others that may need app.json generated.

rchrd2

from django.db import models
from with_distance_manager import WithDistanceManager

class Foo(models.Model):
    longitude = models.DecimalField(max_digits=19, decimal_places=10, null=True)
    latitude = models.DecimalField(max_digits=19, decimal_places=10, null=True)

    objects = WithDistanceManager()

joepie91

Terminology

• View: Also called a "template", a file that contains markup (like HTML) and optionally additional instructions on how to generate snippets of HTML, such as text interpolation, loops, conditionals, includes, and so on.
• View engine: Also called a "template library" or "templater", ie. a library that implements view functionality, and potentially also a custom language for specifying it (like Pug does).
• HTML templater: A template library that's designed specifically for generating HTML. It understands document structure and thus can provide useful advanced tools like mixins, as well as more secure output escaping (since it can determine the right escaping approach from the context in which a value is used), but it also means that the templater is not useful for anything other than HTML.
• String-based templater: A template library that implements templating logic, but that has no understanding of the content it is generating - it simply concatenates together strings, potenti

oakley808

export function* main() {
 const { payload } = yield take(SOME_START_SIGNAL);
 const watcherInstance = yield fork(updateResource, payload);

 // cancel task instance on location change
 yield take(LOCATION_CHANGE);
 yield cancel(watcherInstance); 
}

function* updateResource(id) {

ellismarkf

import { call, put, race, fork, take } from 'redux-saga/effects'

function delay(duration) {
    const promise = new Promise(resolve => {
        setTimeout(() => resolve(true), duration)
    });
    return promise;
}

// Fetch data every 20 seconds

pandafulmanda

Python3 Virtualenv Setup

Requirements

• Python 3
• Pip 3

$ brew install python3

gunjanpatel

Revert the full commit

Sometimes you may want to undo a whole commit with all changes. Instead of going through all the changes manually, you can simply tell git to revert a commit, which does not even have to be the last one. Reverting a commit means to create a new commit that undoes all changes that were made in the bad commit. Just like above, the bad commit remains there, but it no longer affects the the current master and any future commits on top of it.

git revert {commit_id}

About History Rewriting

Delete the last commit

Deleting the last commit is the easiest case. Let's say we have a remote origin with branch master that currently points to commit dd61ab32. We want to remove the top commit. Translated to git terminology, we want to force the master branch of the origin remote repository to the parent of dd61ab32:

picode7

/**
 * Check if localStorage is supported                       const isSupported: boolean
 * Check if localStorage has an Item                        function hasItem(key: string): boolean
 * Get the amount of space left in localStorage             function getRemainingSpace(): number
 * Get the maximum amount of space in localStorage          function getMaximumSpace(): number
 * Get the used space in localStorage                       function getUsedSpace(): number
 * Get the used space of an item in localStorage            function getItemUsedSpace(): number
 * Backup Assosiative Array                                 interface Backup
 * Get a Backup of localStorage                             function getBackup(): Backup
 * Apply a Backup to localStorage                           function applyBackup(backup: Backup, fClear: boolean = true, fOverwriteExisting: boolean = true)

LocalStorage.ts

/**
 * Check if localStorage is supported                       const isSupported: boolean
 * Check if localStorage has an Item                        function hasItem(key: string): boolean
 * Get the amount of space left in localStorage             function getRemainingSpace(): number
 * Get the maximum amount of space in localStorage          function getMaximumSpace(): number
 * Get the used space in localStorage                       function getUsedSpace(): number
 * Backup Assosiative Array                                 interface Backup
 * Get a Backup of localStorage                             function getBackup(): Backup
 * Apply a Backup to localStorage                           function applyBackup(backup: Backup, fClear: boolean = true, fOverwriteExisting: boolean = true)
 * Dump all information of localStorage in the console      function consoleInfo(fShowMaximumSize: boolean = false)